, Volume 30 Issue 5
    

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    石油地质研究
  • Characters of the Eocene composite petroleum system in the west sag of the beach area, Liaohe Depression
    GU Yunfei; FANG Shihu; XU Huaimin; JIAO Cuihua and WU Xinglu
    , 2003, 30(5): 670-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    There are three hydrocarbon systems in the west sag of beach area in Liaohe Depression, and they shared the same sources and accumulated hydrocarbon of mixed origin during their development. The analysis of static elements and dynamic process indicates that the Eocene composite hydrocarbon system is petroliferous because it has high-grade source rocks and has experienced optimal hydrocarbon evolution process. The critical periods for trapping, migration, accumulation and preservation of hydrocarbon are during the deposition of Ed1+2, Ng and at the end of Nm. Three types of composite trap-zones are observed and they are buried hill, steep-slope and flat-slope,respectively. Composite hydrocarbon-bearing units should be the exploration targets in the study area in future exploration.
  • Sedimentation response in rift basin to tectonics and its control to hydrocarbon distribution—An example of Saihantala Sag in Erlian Basin
    OUYANG Wensheng; DOU Lirong; WANG Qi and WANG Wansheng
    , 2003, 30(5): 671-0.
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    It was thought that a single rift was controlled by single boundary fault and there was only one depocenter. However, after studying Saihantala Sag in Erlian Basin, the author found that the depocenter was shifting. According to the evolution of deposition in three dimension, the East boundary fault in the sag was linked after K1bt1 Formation was deposited, at the same time, the regional stress fields changed from northwest oriented to northwest-west oriented. In the forming history of hydrocarbon pools, the main faults propagated and linked alternatively, and the transfer zones were the favorable places of hydrocarbon accumulation, which controlled the distribution of hydrocarbon clearly. The deposition controlled by propagation and linkage of boundary faults has instructive significance to exploration work in rift basin.
  • Relationship between petroleum accumulation and transfer zone in Dongxin Oilfield
    SHI Wendong; PENG Shangqian and JIANG Fengjiu
    , 2003, 30(5): 672-0.
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    Dongxin oilfield is located on the eastern section of central uplift of Dongying Sag in Jiyang Depression, which had been cut by hundreds of faults, is a typical oil trap with complicated fault block. Based on the transfer theory of fault, 11 fault transfer zones are identified, which belong to 4 types (collateral synthetic, collateral convergent, overlapping, and approaching transfer styles). Collateral fault transfer zone is the major style in the eastern Xinzhen area, overlapping fault transfer zone is mainly developed in the western Dongying area, and the central area mainly grows approaching fault transfer style. Fault transfer zones grow on the cross; round and the end of faults generally, are the effect of extensional, strike slip, and inversion structural stress. Several high-quality reserves have been identified in the transfer zones, and the transfer zones are controlled by two faults are richer in hydrocarbon than those in the transfer zones, controlled by one fault.
  • Tectonic episodes and reservoir fissure systems in Caotai metamorphic buried hill reservoir
    FU Qiang; YOU Yuchun and WU Zheng
    , 2003, 30(5): 673-0.
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    Based on the core observation and description, optical slices observing in-filled components in fractures and the stable isotopic analysis, and combined with tectonic episodes of basement rock reservoir came through, it is determined that the formation and development of Caotai metamorphic burial hill fracture reservoir and the formation of basement rock fracture space in Damintun sag of Liaohe Oilfield are closely related to tectonic actions. With the background of Yanshan Movement that was mainly regional tectonic dynamics, three different episodes and character fracture systems just like cataclastic fractures, shear fractures and tectonic fractures were mainly formed in Caotai buried metamorphic basement rock hill reservoir with the compression, tension and shear stress. The fractures have the character of shear that was formed by uplifting intensively at the end of Tertiary Shahejie third period (Es3). Under the influence of uplifting intensively at the end of Dongying period (Ed), newly formed fractures were not be filled, which cut previous fractures clearly and following them, thus new fracture network was formed in basement rock body.
  • Two possible fates for paleo-reservoir oils
    ZHAO Mengjun; ZHANG Shuichang and LIU Fengzhong
    , 2003, 30(5): 674-0.
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    Oil in paleo-reservoirs may subject to two alternative fates when geological conditions change. Oil may be biodegraded into bitumen reservoirs are uplifted, or it can be transformed into pyro bitumen and gas due to cracking when it is deeply buried. The biodegraded bitumen does not possess specific morphology. It has low reflectivity and its extracts are of obvious biodegrading charcaters. The cracked pyrobitumen has several regular morphologies, with higher reflectivith but no extracts. The composition and carbon isotopic charcaters of gases generated from cracked oils are significantly different from those generated from cracked kerogen.
  • Impact of Paleogene evaporates on hydrocarbon accumulation in deep Bonan Sub-sag, Jiyang Depression
    GONG Xiumei and ZENG Jianhui
    , 2003, 30(5): 675-0.
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    A study on the distribution of Paleogene evaporates and their relationship with hydrocarbon accumulation in deep Bonan Sub-sag indicates that: (1) the evaporates are the thickest at the center and thin out to the south and north; (2) the evaporates can serve as seal on top as well as reservoirs when secondary porosity develops within evaporates; (3) overpressure may closely associate with evaporates and the pressure coefficient may reach as high as 1.73 in certain areas; (4) sub-evaporate and evaporate are two major types of reservoirs in the Bonan Sub-sag and therefore greater attention should be paid to the sub-evaporate reservoirs in future exploration.
  • Abnormal high pressure and generation of hydrocarbon
    LI Zhi; DOU Li-rong and AI Xiaolan
    , 2003, 30(5): 676-0.
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    Combined with the experimental results of previous workers, the present research on the relationships among vitrinite reflectance, burial pressure coefficient, oil threshold, and top gas window indicates that abnormal high pressure not only controls the generative phases of hydrocarbons but also results in reduced maturity of source rock and retarded processes of source rock evolution. This delaying effect is particularly clear when pressure exceeds a certain value, which can be inferred by the rise of the oil threshold or the upper limit of the gas window as a result of increase in pressure. In the Niuju-Qinglongtai area of the East Sag, Liaohe Depression, the top gas window is retarded for about 460 meters downward due to abnormal high pressure. Similar relationships between pressure and hydrocarbon window have been confirmed during exploration in some parts of the Bohai Bay Basin.
  • Timing of paleo-oil accumulation in Tadong No.2 Well, Tarim Basin
    SUN Yushan; JIN Yingai; GU Qiaoyuan; SHEN Yinmin and YANG Fan
    , 2003, 30(5): 677-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The Cambrian and the Lower Ordovician in Tadong No.2 Well in the East Tarim Basin produces some amount of heavy oil. There are three types of occurrence of organic material and bitumen: ①carbonized argillaceous black organic matter in rock matrix; ②black carbenes in dissolution veins/fractures due to compaction or primary structural compression, and inter-crystal pores from dissolution; and ③oil bitumen in localized fractures formed during the later structural deformation. Based on bitumen occurrence, carbonate diagenetic sequence and stage, and tectonic history, it is likely that the accumulation of paleo-oil in Tadong No.2 Well took place in two separate periods. The earliest oil was accumulated in the late early to early late carbonate diagenesis near the end of Ordovician. This early palaeo-oil was then destroyed in Late Silurian due to high temperature degradation. The present oil was first formed in the latest Silurian and then it has gone through stratal modification since the Late Paleozoic.
  • Oilfield, Junggar Basin, Northwest China. Part Ⅱ: Geochemical characteristics, typing and oil sources of typical crude oils
    CHEN Jianping; LIANG Digang; WANG Xulong; DENG Chunping; XUE Xinke; JIN Tao; SONG Fuqing and ZHONG Ningning
    , 2003, 30(5): 678-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Using carbon isotopic and biomarker data, the crude oils in the studied area can be divided into five groups. The first is derived from the Permian source rocks, with δ13C values generally less than -29‰, Pr/Ph ratios less than 2, rich in β-carotane, tricyclic terpanes, gammacerane and C28 and C29 steranes, contain almost no diasteranes and a low content of C27 steranes. The second is from the Triassic source rocks, which is similar to the first group in carbon isotopic composition, but is characteristically rich in Ts, C29Ts and diahopanes, and low gammacerane contents. The third group is generated from the Jurassic source rocks, and characterized with δ13C values ranging from -28‰ to -25‰, Pr/Ph ratios generally greater than 4.0, rich in pentacyclic hopanes and C29 steranes, but poor in tricyclic terpanes, gammacerane, and C27 and C28 steranes. The geochemical properties of the fourth group of oils are intermediate between the properties of typical Permian, Triassic and Jurassic oils, and which have little correlation with any of the four known source rocks in the basin. The fifth group of crude oils is isotopically heavy, and originated from Carboniferous source rocks.
  • Geochemical features and classification of crude oils in the Hailaer Basin, Northeast China
    QIN Jianzhong; CHEN Jianping and ZHANG Jiguang
    , 2003, 30(5): 679-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Majority of crude oils in the Hailaer Basin is the oil with normal density, middle to high wax and low sulfur content. Partial oils are light and mature with middle wax, and minority is heavy oils with low to middle wax. The carbon isotopic ratio of the crude oils ranges from -34‰ to -25‰ , and biomarker features are quite different among the crude oils, indicating a great difference in components of organic matter and depositional environments. According to carbon isotopic composition and biomarker features the crude oils can be divided into five groups (1) with the low carbon isotope ratio, high concentration of gammacerane, no diasteranes, and occurs in the Bayanhusu Sag; (2) the oil occurs in the southern part of the Wuerxun Sag, characterized by low carbon isotopic ratio, low to middle content of diasteranes and gammacerane; (3) the oil in the northern part of the Wuerxun Sag and Beier Sag, with lower carbon isotopic ratio, low content of gammacerane, high concentration of diasteranes, Ts, C29Ts, and C30 diahopane; (4) the oil in the Hulunhu Sag, with high carbon isotopic ratio, rich in diasteranes, Ts, C29Ts, and low to middle content of gammacerane; (5) the oil occurs in the Huhehu Sag, is derived from coal-bearing strata, and is characterized with heavy carbon isotopic composition, high Pr/Ph ratio, high content of C29 steranes and diasteranes, low content of C27 steranes, and no gammacerane.
  • Thermal simulation experiment about yield of gas from source rocks in Bohai area
    HUANG Zhengji
    , 2003, 30(5): 680-0.
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    Low mature mudstone taken from Bohai area, in age of Paleogene has been studied by using a thermal simulating experiment. The results show that yield of nature gas of source rocks in Shahejie Formation (Es) are great. So the source rocks are major source for generating nature gas in the studied area. The Sha-3 member (Es3) has the greatest yield potential of gas in the Bozhong Sag and Shanan Sag and the Sha-1 member (Es1) has a same potential in the Qikou Sag and Bodong Sag and Liaodongwan area. For the Dongying Formation, the source rock in Sha-3 member (Es3) has greater potential yield of gas and it is important source rock of gas in Bohai area. The result of a small number sample shows that Preceding Paleogene source rocks of nature gas are efficient, in which the Jurassic source rock has the greatest yield potential for gas generating. The coal-bearing beds of the Carboniferous also have stronger potential of gas generating. A great quantity nature gas has been formed at mature and high mature stage for every type source rocks. So matured and high matured source rocks area should be the major area of gas generating in the Bohai area.
  • Characteristics of diagenesis saline lake environment and its effect on high-porosity zones
    WANG Shenglang; REN Laiyi; WANG Ying; LI Jidong; HE Feng and WANG Yuxiao
    , 2003, 30(5): 681-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In a Lower Tertiary System, the sedimentary environment of Dongpu Sag was a typical saline lake .It characterized by high-salinity and strong alkality. The diagenesis is salient characteristic of the saline lake basin. There is a lot of gypsum and halite, illite has an advantage in the clay minerals, and dissolution and metasomatism are very common and strong. The porosity within the original zone around the depth 2500m is over 20% and the secondary porosity developed zone around depth ranging 2850-3700m are about 14%.
    • 综合勘探开发技术
  • The double serial method and its application in petroleum resource evaluation
    GUO Qiulin; HU Suyun; ZHANG Qingchun and WANG Xiaohong
    , 2003, 30(5): 682-0.
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    Based on Pareto Law, the double serial method is applied to petroleum resource evaluation, which inherits the advantage of POOL SIZE SERIAL way that is simply used and is easily made out. It is improved on: ①the modification of parameters is more quick and more accurate by analyzing system error; ②the scope of its application is enlarged by using double serial module; ③ the result of evaluation is shown scientifically by applying reserve distribution. The example illustrates the route and process of its application in play kd in Nanpi Sag. The results significantly prove that double serial method is a scientific and effective way of petroleum resource evaluation.
  • Prediction models of migration and accumulation coefficient for petroleum migration and accumulation unit
    LIU Guangdi; ZHAO Wenzhi; HU Suyun and ZHANG Zhenying
    , 2003, 30(5): 683-0.
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    Based on the data from 21 petroleum migration and accumulation units in 6 basins, including Songliao, Baohai Bay, Ordos, Tarim, Zhungaer, and Tuha in China, the present study on the relationships between oil migration and accumulation coefficient and some geological parameters suggests that the coefficient is mainly controlled by the age and maturity of source rock, the abundance of traps, and the number of unconformities in overlying strata. Two quantitative models are established, which can be used for predicting the migration and accumulation coefficient in a given petroleum migration and accumulation unit.
  • Comprehensive interpretation of steep faulted zones in east Sichuan region
    NONG Chengji; GUO Ruilin; ZHANG Mingwen and XIONG Lanqiong
    , 2003, 30(5): 684-0.
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    In the secondary rank of structural element in east Sichuan region, there exists a steep faulted zone in the vicinity of all step limp axes of both high steep anticline and low steep structure, especially for to a couple of limp is incoordination (unsymmetrical) folded structural type, which zones affect the accurate interpretation on the seismic information. For this reason, a comprehensive analysis by using multiple disciplines knowledge, including geological and seismic prospecting, drilling, well test and gas reservoir engineering, etc. was used in the interpretation of the structural detail of Wolonghe and Gaofengchang steep faulted zones. The comprehensive interpretation method has a good effect, high fiduciary level and a certain reference value for the interpretation of the structural of the steep faulted zones detail in east Sichuan.
  • Lithology auto-interpretation software system
    DENG Lin and YANG Shaoguo
    , 2003, 30(5): 685-0.
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    One of the key problems in integrative exploration and production is how to lead geophysical data to orient to geological field. A concept and method to create a lithology interpretation software system is presented. The important basis is to calibrate accurately the relationship between geophysical parameters and geological parameters. Discusses of auto-interpretation method from geophysical data to geological field and lithology body auto-interpretation procedure are included. A lithology interpretation software system is presented, that behaved like a technology bridge between geophysical data and geological field.
  • A fine dynamic characteristic study of reservoir in the Chenbei 11 Block
    SUN Xixin
    , 2003, 30(5): 686-0.
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    The Chengbei 11 reservoir is the main development unit of Chengdao Oilfield in Shengli offshore. The data of wells fail to satisfy the need of reservoir description due to few wells. The integral geological model of the whole reservoir is established to evaluate its oil in place accurately used the static parameter field binded by the micro-facies and formed by the well data about 13 sedimentary units at the base of the divide of sedimentary temporal units. The fine dynamic production history match evaluates the water energy of the reservoir. The oil recovery percent and remaining oil in place of 13 sedimentary units are evaluated according to its productivity coefficient and relatively recovery percent and the adjustment projects are devised. The effect of the two devised projects is predicted and the optimum moment of the different production pattern of the well imposed is presented.
  • Relationship between spontaneous potential (SP) and apparent effective thickness (AET) of reservoirs
    WANG Junheng; PAN Zhuping; DENG Mingsheng; ZU Xiaojing; WANG Yuxiang and LI Yule
    , 2003, 30(5): 687-0.
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    The SP surveys in areas more than 30 regions in China so far have been completed in various exploration and development stages. The abundance of hydrocarbon is indicated by every kind of thickness of collector rock which be conversed to be a standard effective thickness; the thickness is called apparent effective thickness (AET). The conversation coefficient could be determined by the variety of collector rock storability (CRS). The positive quantitative dependence discovered between AET and the amplitude of SP have been used to indicate effectively the redevelopment ability of developed reservoirs and used in forecasting of the oil sandstone distribution in Songliao Basin, northeast China.
  • The method Gudao fluvial facies sandstone reservoirs non-equal matter fix quantify token
    ZHANG Zhichun; LIU Guangyou; LI Yongan; CHENG Jianqing; WEI Xinhui and ZHOU Xuewen
    , 2003, 30(5): 688-0.
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    The Gudao Oilfields in Shengli oil area has been developed by water-flooding over 30 years. The text applies a studying way with non-equal matter synthetic exponent. Base on reservoirs fine divide into time units, synthetic use drilling exploration, cored well, testing well and seismic information, get the parameters token the reservoirs non-equal matter. These parameters are transformed to non-equal matter synthetic exponents that impersonality reflect reservoirs, and according to non-equal matter synthesize exponents to forecast remaining oil rich areas, and bring forward remaining oil to dig hidden measures. The method's validity has been validated by the production dynamic information, and achieves to adjust development well patterns, and as a result increase recovery factor.
  • Velocity analysis and normal moveout correction based on linear continuous velocity model
    LIU Yang and WEI Xiucheng
    , 2003, 30(5): 689-0.
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    Stacking quality can be improved by enhancing precision of velocity analysis and normal moveout correction. In sedimentary rock area, rock's velocity augments with the increase of rock's depth. Therefore, underground media shows strong heterogeneity. Accuracy of conventional hyperbolic velocity analysis and normal moveout correction decreases with the increase of the heterogeneity. Non-hyperbolic method should be adopted to improve their accuracy. Based on heterogeneous model－linear continuous velocity model, velocity analysis of two parameters, velocity analysis of one parameter and normal moveout correction are advanced. The research shows that velocity analysis of two parameters needs large computing time and gives multi-solution. When near-surface velocity is known, velocity analysis of one parameter can be used to decrease multi-solution and computing time.
  • Interpretation of variable-speed imaging techni-que on the conglutinates structure in Futai Oilfied, Shengli
    ZHAN Chunguang; WANG Xuejun; ZHANG Jiazhen; FAN Zhenfeng and BI Caiqin
    , 2003, 30(5): 690-0.
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    The conventional time-to-depth conversion is not very useful in high-resolution structural analyses. Based on interpreting the geophysical characteristics of subtle hydrocarbon traps in Futai Oilfield, Shengli Province, variable-speed imaging technique is adopted to perform variable-speed time-depth conversions for different interpreted layer. The accuracy of structural interpretation is largely increased by eliminating depth errors resulting from “velocity pitfalls”of sand-conglomerate bodies through conventional conversion. This lays a foundation for exploration-targets recognition and reserves estimation.
  • Application of discrete wavelet transformation for time-delay estimate in vibroseis exploration
    JIANG Zhongjin; LIN Jun and CHEN Zubin
    , 2003, 30(5): 691-0.
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    In order to improve the accuracy of time-delay estimate and reduce noise in processing vibroseis signals, two-dimensional correlation arithmetic of time-frequency distribution in discrete wavelet transformation technique is applied to replace the traditional time-domain correlation method. The simulation experiment demonstrates that this new technique can more precisely estimate the time delay than the time-domain correlation method, and it also significantly reduces noise.
  • Estimate produced fluid type of low resistivity hydrocarbon-bearing reservoirs from relative permeability
    GAO Chuqiao; ZHANG Chengguang; XIAO Chengwen and SONG Fan
    , 2003, 30(5): 692-0.
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    For low resistively hydrocarbon-bearing reservoirs of high content of irreducible water, though the hydrocarbon saturation is very low, it can also produce pure gas. On the base of a case study about H oilfield, the method for calculating oil-water relative permeability, the water saturation and irreducible saturation is used to calculate it, and the technique to estimate production fluid character of low resistively petroleum deposit, to identify low resistively hydrocarbon-bearing reservoirs from relative permeability is discussed. It is concluded that the Archie' exponents measured at high temperature and high pressure should be used when calculating water saturation of low resistively petroleum deposit.
  • Use of SPE ZSM-5 for rapid isolation normal alkane fraction in crude oils
    ZHANG Meng; ZHAO Hong; WANG Huitong; ZHU Zhongyun and WANG Peirong
    , 2003, 30(5): 693-0.
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    A normal alkane isolation procedure in crude oil saturated fractions by molecular sieve inclusion has been established for biomarker database setup with QA and QC. It is subjected to 12-manifold vacuum SPE apparatus packed with ZSM-5 molecular sieve. Of the tests under three different conditions, the preferred procedure is character of isooctane as elution solvent and molecular sieve with 300∶1 atomic ratio of silicon to aluminum. The results is excellent with all normal alkanet removal and with relative deviation of repeated tests less than 11% and relative deviation of biomarker parameter value in Well Hong 30 before and after inclusion less than 4%. This procedure meets the environment protection demand due to the low amount of solvent consumption.
    • 油田开发与油藏工程
  • Reconstruction of hydrodynamic geology effect of reservoir development on reservoir
    LI Jian and LI Hongnan
    , 2003, 30(5): 694-0.
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    The 2 & 3 sand group of upper Sha-2 sub-member of Shahejie Formation in south block of Pucheng Oilfield of Dongpu Sag belongs to middle to a low permeability reservoir. It's been exploited and developed over 20 years and has come into special high water bearing period. When the water content within the reservoir is up to 81%, the dissociated grains occupy 30%. The secondary dissolution pores could be formed along the cleavages and surfaces of framework grains (feldspar and detritus). Some dissolved crystals build up the pore channels. The calcites and quarts generate along the pores increase the complication of primary pore channels net. So many irregular dissociate pores forms during special high water bearing period. Under the long time mainating and scouring of injected water, the percolation flow factors of reservoir become worse and heterogeneity and hydrophilic increase and the span of two-phase flow in relative permeability curves is small.
  • Remainined oil distribution in complicated faulted blocks and its accessory potential exploitation measures
    DOU Songjiang and ZHOU Jiaxi
    , 2003, 30(5): 695-0.
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    Within the Gangdong development area of Dagang Oilfield, three kind potential areas of remaining oil are put forward by means of reservoir fine description which takes 118 time-stratigraphic cells as study targets. Producing oil formation is the first kind, in which the remained oil are dominated by fault and micro-structure, imperfect injection and production pattern, interval heterogeneity, low permeable zone on plane, internal seepage barriers, the stagnant area of injection and production, bottom water coning and so on. The second is new-strata, involving the low-resistively oil formation not being found in the past and the oil sand being found freshly. The third is progressive development area. Taking single sand bodies and flowing cells as the potential-finding and adjusting targets, the new and renewal wells are drilled in potential enriched areas, driving types of non-dominating oil formation are changed, layer series and well pattern are regrouped, the fluid direction is changed and cycle injection is adopted, and at the same time, to potential areas, new layers are perforated, liquid productions are increased, fracturing and sand prevention, re-perforation, and deeply profile controlling technologies and so on are applied. After the accessory potential exploitation measures of complicated block reservoir of Gangdong development area are put into practice, both the development benefits and levels of high water-cut are improved.
  • Regrouping adjusting of the producer-injector well-pattern in the high aquifer period of oilfield development
    YUAN Xiangchun and YANG Fengbo
    , 2003, 30(5): 696-0.
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    Thick pay layer widely developed in the Shuanghe Oilfield, Henan. In the high water-bearing development phase, the underground remained producing reserves potential were located at inner intervals part and producer-injector not perfect area, the remained area between multiple oil wells and water-injector wells, and the pressure balance area. Based on the producer-injector related of wells group readjusting, a few new wells should be drilled. The comprehensive treatment of the confined reservoir, add perforated zone and profile control of the old wells and the low effective well, and to combine the producer-injector relation and changing fluid flow direction will be able to increase injecting water swept volume and elevate displace pressure gradient to develop remained oil. After well pattern regrouped adjusted in the pay Ⅳ1-3 of the north block in Shuanghe Oilfield, the producer-injector wells ratio added from 0.63 to 0.82 and the water-drive recovery efficiency has been risen from 46.28% to 49.5%.
  • IPR of tight formation with jam near well bore
    HE Shunli and ZHENG Xiangke
    , 2003, 30(5): 697-0.
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    Analytical development of inflow performance relationships of tight formation with jam near well-bore has been done based the Wiggins' work. The facts influencing the production performance are analyzed on the basis of the deduced equation. The results show that the effect of threshold pressure gradient is very distinctive, there lies the linearity relation between damage radius and the threshold pressure, the bigger formation pressure and the less extent of production decline, and there is no influence on the nomoralized IPR from skin parameter. The application of the theory for 2 wells in certain low formation in China shows that the interpretation of such analysis is more according with the actual production.
  • An integrated model for sand control well productivity prediction in the Gudong Oilfield
    ZHANG Lina; ZHENG Weilin; HUANG Chun; ZHANG Guorong and HUANG Xu
    , 2003, 30(5): 698-0.
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    Productivity ratio (PR), the ratio of oil production index before and after sand controlling, is put forward to evaluate the effect of sand control measure on well productivity. According to the additional flow resistance areas formed by 4 sand control measures and corresponding skin factors，considering the non-Darcy flow, the calculation method of PR is presented. Inflow performance relationships indicating well productivity, the formula can be used to predict IPR and productivity after sand control measure by the IPR before sand control measure. This method needs few basic data and the results are credible. This model has been applied into Gudong Oilfield and the results are accordant to the real data.
  • Research on mechanism of solution mining for building underground gas storage in salt cavern
    ZHAO Zhicheng; ZHU Weiyao; SHAN Wenwen and WAN Yjin
    , 2003, 30(5): 699-0.
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    Process of salt cavern dissolution is a dynamic process of material balance between cavern surface and solution. Based on the theory of hydrodynamics, convectiondiffusion and material balance,the mathematics model for solute transmission and liquid flowage was established to evaluate the field of consistence and velocity in the salt cavern. According to the solution mining mechanism, a dissolution velocity equation for halite was derived to describe the development of salt cavern. The numerical simulating result and the physical simulating result were in good agreement, suggesting that the mathematics model will be able to describe the pattern of solution mining and direct the engineering.
  • Microbial enhanced oil recovery in low-permeability reservoir
    LI Wei; LIU Rulin; SHI Mei; HOU Zhaowei; HAN Peihui and YANG Zhenyu
    , 2003, 30(5): 700-0.
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    A huff-puff test with MEOR has been carried out in Chaoyanggou reservoir with a low permeability in Daqing Oilfield. By using a series of bio-chemical analyses, the evaluate and test on the effects of experiment and field show that the microbes can grow under the reservoir condition with low-permeability perfectly. The rheology of treated oil can be changed in a great deal and the content of paraffin and gel be reduced 31% and 32.6%,respectively, due to the action of the bacteria. The interfacial tension between water and oil can be decreased. The gas chromatography analysis found that the light component increased and the heavy component decreased in crude oil. MEOR may be a good method to increase oil recovery and adjust wells for low-permeability layer with high viscous thinning oil.
    • 油藏物理
  • The influence of aqueous phase trapping on gas flow by pore scale network model
    WANG Jinxun; WU Xiaodong and PAN Xinwei
    , 2003, 30(5): 701-0.
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    Aqueous fluid may invade into gas reservoir during drilling, completion and subsequent production operations. A portion of this fluid is still retained in the formatiom in the vicinity of wellbore even after inversing well-flushing. Permeability for gas phase is therefore greatly reduced in these areas. Pore structure is a key factor affecting the trapping of aqueous phase in gas reservoir. Considering the microscopic distribution of the retained phase, Bethe network is introduced to simulate the trapping process, and predict its effect on gas permeability reduction for different size and uniformity of throat distributions. It is shown that pore scale network model is an efficient tool to relate the microscopic aqueous trapping mechanism to the macroscopic gas permeability reduction.
    • 学术讨论
  • Negative pressure and empty suction: one of the forming-reservoir mechanisms of structure fractured oil and gas reservoirs
    LU Tingqing; SU Peidong; CHANG Jianmin; MU Zhonghai and QIN Qirong
    , 2003, 30(5): 702-0.
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    Earthquakes have influences on forming oil and gas reservoirs. Stress librated from earthquake would always be violently changed before or after an earthquake. It's used to analyze the processes of oil and gas migration and forming reservoirs, which are divided into four periods: pre-equilibrium, pre-preparation, forming-reservoir and re-equilibrium. In the process of forming reservoirs, the earthquake fractured net will be produced. After the stress values jump from highest to lowest, the underground liquids quickly migrate and fill fully the new produced fractures and form structure fractured reservoirs in the process of the giant stress differences, the negative pressure and the empty suction.
    • 国际交流与合作
  • Hydrocarbon perspective of the Alay Basin, Kyrgyzstan
    TONG Xiaoguang and XIAO Kunye
    , 2003, 30(5): 703-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Along with Tajik Basin and the Southwest Southwest Depression of Tarim Basin, Alay Basin was one of the remnant basins on the north rim of the Tethys during the Late Triassic to Paleogene, it became a peripheral foreland basin in Miocene. It is estimated that the maximum thickness of sediments is approximately 8000 m in the south. The sediments become significantly thiner to the north. Based on correlation with other nearby basins, it is predicted that the Cretaceous limestone and the Paleogene black shale/mustone are present in the subsurface of the basin. The coal-bearing Jurassic is likely the source rock. The reservoirs should be developed in faulted anticlines of Cretaceous and Paleogene rocks, and possibly Neogene sediments. However, no reservoir was found in Well Alay-1 which was drilled in 1991. It is probably due to penetration of the oil-water transition zone. The Alay Basin possesses considerable hydrocarbon potential.
  • Characteristics of evolution and distribution of lithologic trap in Dongying Delta, Shengli Oilfield
    FANG Yong; DENG Hongwen; Massimo SARTI; WAN Xiaoqiao and FENG Xiaojie
    , 2003, 30(5): 704-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Turbidity lithologic trap developed in the Dongying Delta is one of important exploration targets in Sha Member 3 of the Shahejie Formation in Shengli Oilfield. Over 10 million tons of oil reserves had been discovered from the lithologic trap annually in last few years. In-depth understanding of its formation mechanism and distribution is crucial for improving exploration success in such subtle lithologic reservoirs. Applying the theory and methodology of high resolution sequence stratigraphy, the genetic types and distribution of turbidity sandbody related to the Dongying Delta are discussed depending to the construction of stratigraphic framework, and delta evolution process, classification of paleo-tectonic break type and matching of different stage delta with tectonic break are analyzed.
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