, Volume 33 Issue 1
    

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  • CHEN Mengjin; WANG Zecheng; GUO Yanru and XIA Mingjun
    , 2006, 33(1): 1222-0.
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    The degree of natural gas exploration is lower in the south Ordos Basin, and there are poor understandings to geological conditions of gas reservoir forming and exploration potential in the area. Based on the analysis of field observations and well-data, four main provenances have been identified by means of lithologic properties, sedimentation analysis and paleo-structure reconstruction, etc. Taiyuan Formation belongs to a barrier shoreline system with the facies sequence of tide flat-lagoon-barrier-carbonate platform. Shanxi Formation is a meandering river delta system, and Lower Shihezi Formation is a braid river-delta system. The gas exploration potential is great with high quality source rocks and good combinations of reservoir and cap rocks.
  • 油气勘探
  • ZHAO Wenzhi; WANG Xinmin; GUO Yanru; LIU Huaqing and BAI Yunlai
    , 2006, 33(1): 1223-0.
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    Restoring prototype basin is an important issue for evaluating oil and gas prospect of Upper Triassic in west Ordos Basin. The authors point out that the Qin-Qi Fold Belt and Alashan ancient land controlled the borderline of the western Ordos prototype basin in Later Triassic. The large borderline faults of west Liupanshan and west Helanshan were the southwest and northwest borderlines of the Upper Triassic prototype basin. There is no clear boundary line between the Hexi Corridor and the cadre of the basin. The prototype basin is a large NW-SE asymmetric depressed basin, which is deep in south and shallow in north.The Yinchuan Basin and Liupanshan Basin are part of the prototype basin in the Yanchang stage of Upper Triassic. There are four delta sedimentary systems, which are Ruishuihe-Zhenyuan, Jingtai-Huanxian, Yaoshan-Tianshuipu and Rujigou-Yanding delta sedimentary systems, with different sedimentary characteristics from south to north in western Upper Triassic basin. These delta sedimentary systems were altered in Late Indosinian, Mid-Yanshanian, Late Yanshanian and Himalayan, denudated badly in the hanging wall of the west thrust belt, and conserved integrally in the east of the present thrust belt. The extensive residual Yanchang Formation sedimentary system has good prospecting.
  • WU Shixiang; MA Yongsheng; JIN Zhijun; TANG Liangjie and LI Rufeng
    , 2006, 33(1): 1224-0.
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    The features of the Micangshan foreland basin are distinctive, the thrust belt and frontage upheave are well developed, and under the influence of Daba Mountain, the earlier NE structures are overlapped by later NW faults and structures, resulting in the complex tectonic features there. The analysis of key balanced seismic sections in the area and the calculation of the amount of shorten length in the layers indicate that the major tectonic movement which caused the biggest deformations was at the end of Early Triassic other than Middle Triassic. From west to east along the mountain, the intension, the amount of shorten length and the time of deformation become weaker, smaller and later,respectively. Under the influence of this kind of evolution mode and time, the pile up tile structures along the Micangshan, Heichiliang, Fuyangba and Nanyangchang areas are the promising targets for natural gas play, but the factors of pool forming in the areas are different, so different exploration strategies should be considered.
  • YANG Xiaoping; ZHAO Wenzhi; CAO Hong; YANG Yu; ZHANG Baomin and TAO Shizhen
    , 2006, 33(1): 1225-0.
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    Some giant gas reservoirs have been found by PetroChina in Luojiazhai, Dukouhe, and Tieshanpo in the Sichuan Basin. The analyses of core, thin sections, minor element, liquid fluid inclusion, XRD, cathodoluminescence and electron microprobe suggest that dolomitization and dissolution are the key factors, and mixing dolomitization and buried dolomitization are the basic factors for forming favorable reservoirs in Feixianguan Formation. In the oolitic bank reservoirs four periods of dissolution can be identified including the surface meteoric water dissolution, organic water dissolution during shallow-buried, organic water dissolution during deep-buried period and the dissolution in the basin risen up, of them the organic water dissolution during the shallow-buried and deep-buried periods are the important dissolutions for forming favorable dolomite reservoirs. The favorable dolomite reservoirs are mainly distributed in the oolitic bank of shelf margin, vertically interbedding with sparry oolitic limestones and literally distributed on the lagoon-tidal flat side of the oolitic bank.
  • FENG Youliang and XU Xiusheng
    , 2006, 33(1): 1226-0.
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    Syndepositional structural slope-break zone is a basic characteristic of rift-subsidence basin. According to the formation origin, syndepositinal structural slope-break zone can be divided into syndepositional fault structural slope-break zone and syndepositional anticline structural slope-break zone. Five syndepositional structural slope-break zone patterns are identified according to their fault distributions on the horizontal level, as "brush", "steep parallel", "gently parallel", "crossed", and "comb-like". Two syndepositinal anticline structural slope-break zone patterns are also identified as antithetic dragged anticline and drape anticline. The combinations of 7 syndepositional structural slope-break zone patterns and grooves on basin edge control low-stand tract sand bodies, good source rocks and hydrocarbon accumulation, and accordingly control the development and distribution of lithologic oil reservoirs.
  • CHEN Liang; WANG Hua; HAN Jinyang and GAN Huajun
    , 2006, 33(1): 1227-0.
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    Based on data of log, core and 3D-seismic, the sequence stratigraphy features and sedimentary facies of the stratum of Eh3 upper member of Hetaoyuan Formation in the south of Xia’ermen Oilfield, Biyang Sag, are studied. Three 3-order sequence interfaces are recognized in the member. The authors divide the target layer into three 3-order sequences. There are four kinds of sedimentary systems identified in the target layer, including delta, fan delta, lacustrine, and deep lacustrine turbidity sedimentary systems. According to the plane distribution, evolvement features of the sediment system and the condition of stratum-lithology pool forming, an potential exploration prospect is proposed.
  • CHEN Hao; ZHANG Hongbo; CAO Xueliang; HUANG Xinwen and CHEN Xinping
    , 2006, 33(1): 1228-0.
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    The study suggests that the sedimentary facies and sand body types of the middle sub-section of the Es3 in the Wendong area, Dongpu Sag, are developed neither in shallow water nor in deep water, it should be a sediment developed in the alternate environments between shallow and deep water.According to the sedimentary features, the middle sub-section of the Es3 is divided into 3 shallow water sediments and 3 deep water sediments. The sedimentary facies of the shallow water sediments are low stand tract deltas, and the sands are sub-water tributary, estuarine bar and sheet sands. The sedimentary facies of the deep-water sediments are sub-lacustrine fans that are channel, tributary and over-bank sands.
  • MENG Yuanlin; GAO Jianjun; NIU Jiayu; SUN Hongbin; YIN Xiulan; XIAO Lihua; ZHOU Yue and WANG Yuechuan
    , 2006, 33(1): 1229-0.
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    The controls of the sedimentary microfacies of fan-delta on the diageneses in the south of the western Liaohe Depression, Bohai Bay Basin are discussed by using measured porosity data, thin sections, blue epoxy resin-impregnated thin sections, SEM,and XRD. The results show that the mineral comparative maturity of sandstones increases with the distance from the fan-delta plain to the fan-delta front;of all kinds of sandstones in the fan-delta microfacies, channel mouth bars have undergone the most intensive dissolution, secondary pores are well developed, and diageneses of the braided channel and channel bar sandstones are dominated by compaction and diageneses of the channel mouth bar and marsh sandstones are dominated by cementation. The cementation materials of the sandstones in the marsh and profan-delta are mainly calcites (carbonates), while the interstitial materials of channel mouth bar, channel bar and braided channel deposits are mainly clay. The sedimentary microfacies of the fan-delta have significant controls on the diageneses and mineral components of clastic reservoirs.
  • 油气田开发
  • CHENG Haiying; WANG Xiulin; XU Dengting; MA Guangdong and WANG Weidong
    , 2006, 33(1): 1230-0.
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    In order to research the feasibility of enhancing oil recovery by injecting corn syrups at Block Zhan-3 in Shengli Oilfield, the composition of indigenous microorganism community in formation water was analyzed by using MPN (most probable number) counts, and indigenous microorganism cultivation and core flood experiments were conducted under simulated oil reservoir conditions. Results show that main microbial populations in the reservoir are saprophytic bacteria, hydrocarbon-oxidizing bacteria and ferment bacteria. Indigenous bacterial populations present in formation water could be effectively activated by corn syrups to grow and metabolize, biogenic surfactant and gas are important products contributing to enhance oil recovery. SRB could be effectively controlled by the addition of ammonium nitrate. In core flood experiments, after injecting 0.4PV nutrient slug of 10-20mL/L corn syrups concentration into cores and 15-20 days of subsequent incubation to allow for in-situ microbial maximum growth, the recovery increases by 8% OOIP. The technology to activate indigenous microorganisms by the injection of nutrients into reservoir for improving oil recovery is proved to be practicable at the Block Zhan-3.
  • 油气勘探
  • SHI Jiannan; HAO Fang and JIANG Jianqun
    , 2006, 33(1): 1231-0.
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    The overpressure states of sedimentary basin are multiform, and their evolutions are systematic. In the Damintun Sag, when "the rate of overpressure generation" was higher than "the rate of overpressure release", overpressure built up, contrarily, with the termination of "overpressure generation", overpressure diminished. The evolution of overpressure was dynamic in nature. On the basis of analyzing burial histories, hydrocarbon generation histories and heat flow histories, the process of overpressure evolution was simulated. Multiple-factor coupling of the overpressure evolution suggests that the compaction disequilibrium and hydrocarbon generation are the main controlling factors in different phases of the development and evolution of overpressure in this region.
  • HUANG Handong; LUO Qun; WANG Chunying; JIANG Xiaojian and ZHU Zhijin
    , 2006, 33(1): 1232-0.
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    There was common denudation in the Mesozoic group in the west of north Qaidam Basin, the denudation quantity played a big role in the correct evaluation of petroleum exploration potential of the whole research region. The authors estimated the Mesozoic stratigraphy denudation thickness and recovered the thermal evolution history of the main source rock by using the "seismic profile method", "Ro method", "matter balance method", and "sonic-time method". The study indicates that the hydrocarbon migrating and accumulating events mainly occur in the Tertiary,there are no huge scale hydrocarbon generating and petroleum migrating, accumulating events before the Tertiary in the study region. There is good petroleum resource potential in the west of north Qaidam Basin.
  • ZHAO Jingzhou; MENG Xiaoling; YANG Xianchao and WU Fuli
    , 2006, 33(1): 1233-0.
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    The oil-bearing strata in the Yaodian Oilfield,North, Ordos Basin, belonging to the Upper Triassic Yangchang Formation,are mainly composed of gray and grayish fine sandstones. The analyses of sedimentary facies of 70 wells and the grain-size distribution figures of tens of wells show that the sand bodies of the Chang 6 oil-bearing unit are mainly lacustrine delta deposits,including delta plain and delta front. There is one main stream in Chang 61 sand beds,three streams and two streams in Chang 62 and Chang 63. The sedimentary facies and structure in the study area have significant effects on oil and gas distribution and production.
  • HE Jiaxiong; XIA Bin; SUN Dongshan; ZHANG Shulin and LIU Baoming
    , 2006, 33(1): 1234-0.
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    Qiongdongnan Basin is an oil-bearing fault-depression structural basin developed in Cenozoic at the passive continental margin of the South China Sea. The hydrocarbon migration, accumulation and distribution were analogous to the continental fault basin in East China. The hydrocarbon migration, accumulation, distribution, reservoir combination and accumulation controlling factors are quite different for zones because of various hydrocarbon origins and complex source rocks. According to the type of hydrocarbon origins and the 2 reservoir combination modes, "self-generation and self-storage" and "lower-generation and upper storage", hydrocarbon migration and accumulation rules are discussed to provide basis for lowering exploration risks.
  • ZHANG Yan; ZHANG Ying; SUN Xiping and ZHENG Xiaodong
    , 2006, 33(1): 1235-0.
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    The basic content of seismic reservoir prediction covers a large prediction range from petrofacies, lithology, petrophysics, to oil and gas distribution. The whole process of petroleum exploration and development includes preliminary exploration, evaluation, productivity establishment and production. Due to different geological background, exploration level, basic information, and demands, there are relatively large differences in application of seismic reservoir prediction techniques. In the preliminary exploration stage, the function of seismic reservoir prediction is to investigate the vertical structure of strata and the sedimentary system, and to set up the macro concept of proven reservoirs on the base of well data. In the evaluation stage, the seismic reservoir prediction technique is applied to predict petrofacies, lithology, petrophysics of the reservoir, and hydrocarbon-bearing characteristics, and to supply bases for designing the development program. In the productivity establishment and oil/gas production stage, seismic reservoir prediction is utilized to depict the reservoir, to predict the residual oil distribution and to provide foundation for development plan adjustment. Seismic reservoir prediction techniques and the difficulties in application on various stages are analyzed comprehensively.
  • ZHANG Yanzhang; YIN Shoupeng; ZHANG Qiaoling and MIN ChengHua
    , 2006, 33(1): 1236-0.
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    The seismic spectral decomposition technology is a new seismic imaging analysis method based on the spectral analysis technology, it can reveal the changing law of stratigraphy in vertical direction and 3-D evolution pattern of sedimentary facies. The quantificational description and analysis are carried out from reservoir to single sand set unit. In the primary oil-bearing stratum of Jurassic Badaowan sets at the Well 530 area of the K Oilfield, the seismic geologic condition is of changing reservoir thickness and geophysical property, poor seismic data quality, and it is difficult to identify and predict reservoir facies by the routine seismic property analysis method. The seismic spectral decomposition technology has been creatively introduced into the new fine reservoir description, therefore, the 3-D evolution pattern of sediment facies is showed, and the prediction pattern of reservoir and good results are obtained.
  • ZHANG Longhai; DAI Dajing; ZHOU Mingshun; QIAO Dexin; NING Congqian and LI Chaoliu
    , 2006, 33(1): 1237-0.
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    The sand bodies in lake basins are of small size, irregular distribution and strong heterogeneity, and the imaging logs with high resolution, large coverage and fine visualizability are required to study such reservoirs. The main applications of imaging logs in the study of lake basin sedimentations include the following. The imaging logs were used to verify the reliability of rhythmicity indicated by the shapes of conventional logs, which shows that it is reliable to use the bell-shaped and box-shaped logs to indicate the positive rhythm, while the reliability of using the egg-shaped logs to represent the positive rhythm is not so good, and the funnel-shaped logs do not necessarily correspond to the negative rhythm. The imaging logs can be employed to identify facies marker, most of the facies markers can be identified by using imaging logs except for the colors of rocks. The imaging logs can be applied in determining sand body frames, in the rocks of the sub-facies of the braided river delta front in H Oilfield, the analysis based on the imaging and conventional logs shows that the number and thickness of the positive rhythms are much bigger than that of the negative rhythms, leading to the conclusion that the main sand bodies are of the under-water distributary channel, not of mouth bar. Sedimentary characteristics from the calibrated imaging logs can also be used to accurately identify lithology, rock combination, and sedimentary sequences, and correct the cutting logs in complex formations, hence recover the correct lithological profile and sedimentary environment.
  • ZHANG Zhenling; WU Liyan and SHU Nianzu
    , 2006, 33(1): 1238-0.
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    The abnormal Tmax values have been observed on Rock-Eval pyrolysis in over 25 000 source rock samples in China. Some Tmax values are abnormally high, some abnormally low, and others decrease following an abrupt increase at certain depth. These phenomena are incompatible with the buried depth and ages of the samples. Source rock and kerogen simulation experiments, and activation energy distribution measurement of kerogen maceral have been carried out to find the causes of the abnormal Tmax values. The bitumen, migrated oil and contamination from organic additive and oil of drilling mud enhance S1 peaks of source rocks. Some soluble heavier fraction overlaps S2 peaks, resulting in lower Tmax values. The abundant resinite in maceral is also the cause of lower Tmax values. The mineral matrix conservation on hydrocarbons and the intrusion of igneous rock in source rocks attribute to higher Tmax values as well. The sample weight influence on Tmax value has also been discussed.
  • WU Hongling; WANG Xiaofeng; MA Yinsheng; ZHOU Xianqiang; CHEN Xuanhua; CAO Chengjie and QIAO Zijiang
    , 2006, 33(1): 1239-0.
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    The tectonic stress field is one of the most important factors of controlling oil and gas, migration and accumulation. According to the Continuum Mechanics the authors have analyzed the mechanism of the tectonic stress driving oil-gas to move in porous media. The concepts of effective stress and porous pressure are employed to explain why the tectonic average stress can be used as a coupling bridge between the solid skeleton and porous fluid. In the study of the tectonic stress field driving oil-gas migration and accumulation in the Nanyishan area of the west Qaidam Basin, the finite element numerical method is used to derive effective fluid pressure and fluid potential from tectonic average stress, and the Darcy law is used to get the fluid velocity fields caused by the action of tectonic stress, the results lay foundations for predicting the favorable location of oil-gas collection.
  • CUI Xingfu; XU Ling and CHEN Likang
    , 2006, 33(1): 1240-0.
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    When topography and elevation differences vary between stations, conventional vertical static time shift will cause wave-field distortion. A novel approach of wave equation datum plane correction based on the single square-root operator is proposed: the seismic data on rugged acquisition topography is continued up to the datum plane above topography starting from some depth below near surface, by filling an additional layer between datum plane and topography with the velocity close to that of the first arrival wave. In common shot gathers, based on the Fresnel Principle and location of receivers, regarding the recorded data on real surface as a secondary emission the receivers are continued to the final datum plane by the forward propagation of upcoming wave. As a cascade step, all sources are continued up to the final datum plane in common receiver gathers, by the inverse propagation of down going wave based on the reciprocal principle of source and receiver. Numerical experiment results indicate that the method is correct and efficient, and is good for the subsequent seismic data processing.
  • 油气田开发
  • FENG Hu; WU Xiaodong; LI Mingzhi and XI Changfeng
    , 2006, 33(1): 1241-0.
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    In order to calculate the optimal flowback rate during fracturing of low permeability condensate gas reservoir, a flowback physical model of fracturing is established, the conformal transformation method is used to transform the elliptic flow region formed during the fracturing to circular flow region, then the radial flow productivity formula is used to calculate the gas well productivity after the fracturing. Field analysis with the productivity model reveals that the gas productivity is affected by flowback rate, a flow rate either lower or higher than the optimal one may decrease the gas well productivity. In the middle of 3rd member of Shahejie Formation, Baimiao Block, Zhongyuan Olifield, Sinopec, the optimal productivity will be 15 000 m3/d with the optimal flowback rate of 100 m3/d.
  • QI Zhilin; DU Zhimin; TANG Yong; DENG Ruijian and YAN Wende
    , 2006, 33(1): 1242-0.
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    Snaky well is a new type of complex well. The wellbore pressure drop of snaky well can't be neglected for its producing interval has large fluctuation,and the conventional productivity calculation methods for horizontal wells could not be applied directly for snaky wells. It is necessary to set up a model for calculating steady state productivity of snaky wells. On the basis of a snaky well's distribution of potential produced in an infinite reservoir, this paper uses the mirror image and the principle of superposition to obtain the velocity potential and pressure distribution for bottom water reservoirs with and without gas cap, and edge water reservoir. Coupling wellbore flow with fluid flow in the formation, a steady state productivity model for the snaky well is developed and solved. Example calculation shows that the steady state productivity model of snaky well should be used in calculating the productivity of a horizontal well with large fluctuation; otherwise, big errors would be produced.
  • CHEN Zhihai; DAI Yong and LANG Zhaoxin
    , 2006, 33(1): 1243-0.
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    In order to study the production performance of fracture-cavity reservoirs, the R/S analysis is used to analyze the oil production rate of fracture-cavity reservoirs of Tahe Oilfield, Tarim Basin, which shows good fractal characteristics. The fractal dimension is generally irrelevant to the type of fluid produced. The fractal dimension is different for the same producer producing with different size of chokes; the fractal dimension value is larger for larger chokes. The fractal dimension represents the stability and potential of well production; large fractal dimension value suggests stable production. From the point of geology, the fractal dimension value reflects the development of fractures and cavities in the fracture-cavity reservoir; larger fractal dimension value means better development of fractures and cavities.
  • JU Binshan; FAN Tailiang; ZHANG Jinchuan and WANG Xiaodong
    , 2006, 33(1): 1244-0.
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    The oil viscosity increases with the water cut in the process of waterflooding development. In the current commercial simulators for water drive reservoirs, the oil viscosity is treated as a unary function of pressure without considering other factors' effect. To improve the accuracy of numerical simulation, a new mathematical model,in which the oil viscosity changes with water-cut, is presented based on the black-oil model, and a new numerical simulator is developed. The production performance at different ranges of oil viscosity variation was studied with the oil field examples run on the simulator. The study shows that the increase in oil viscosity in the process of water drive results in the shortening of water-free oil production period, the acceleration of water-cut increase and the reduction in oil recovery. The accuracy of the model is tested by an oilfield example.
  • GAO Chengtai; LU Tao; GAO Weixin and HAN Jiyong
    , 2006, 33(1): 1245-0.
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    In order to overcome the deficiencies of the material balance method and numerical simulation methods in studying the gas reservoir performance, the material balance method for multi-region gas reservoir is extended to the case where the reservoir has edge water region and is divided into arbitrary number of blocks. The new method takes into account the regional heterogeneity of the gas reservoir, and the data required in the new method are acquired in field production. The software MMBS based on the multi-region material balance method could help to conveniently optimize the well pattern, make the best use of the productivity of high yield blocks and decrease the number of low yield wells. The calculation example shows that the recharge from the neighbor blocks contributes a lot to the single well production.
  • TANG Junwei; JIA Ailin; HE Dongbo; WANG Weihong; FAN Lihong; BAI Quanming and LIU Fengzhen
    , 2006, 33(1): 1246-0.
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    The Sulige gas field in the Ordos Basin is characterized by low permeability, strong heterogeneity and middle-to-high pressure-sensitivity, and the gas wells have low productivity and a short stable production period. The single well simulations and production performance analysis reveal that producing with low daily output can reduce the effect of rock pressure-sensitivity, and that strengthening the management during the period of low production will help to utilize the formation energy rationally and to improve the working state of the reserves distributing in the low permeability area beyond the well drainage. Separate layer fracturing and commingling production can make the most of the controlled reserves in vertical, increase the final cumulative gas production and extend the stable production period. Integrating geological research with seismic interpretation is the key technology for improving the precision of the reservoir forecast and the ratio of successful drilling. Cost-cutting and striving for preferential policies are also effective ways to enhance the economic return.
  • ZHOU Fujian; XIONG Chunming; ZONG Yiping; YANG Xianyou; ZHANG Shouliang; SUN Lingyun; LI Jiangtao; WANG Junchen and WU Xuean
    , 2006, 33(1): 1247-0.
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    Sebei gas field in the Qaidam Basin is the fourth largest gas field of China. Its main pay-zone is unconsolidated Quaternary fine siltstone and pelitic siltstone with serious sand production, where the conventional sand-control methods are of no effect. According to the study of the Sebei reservoir, it was considered that the formation pretreatment technique to stabilize fine siltstones with soft fiber should be used in the sand control system. The formation pretreatment fluid is made up of surfactant that can prevent rock wettability reverse and soft fiber to stablilize the fine grains. Based on the study of the framework and performance of the 3-D sand controlling complex composed of fiber and resin-coated sand,a special fiber-and resin-coated sand complex,which has good stability under reservoir conditions and has capabilities against high temperature, acid, alkali and formation water corrosion, was developed. Clear fracturing fluid that can protect reservoir was prepared by using brine water, and TSO (tip screen out) fracturing and sand control technique was elaborately designed. Finally an integrated screenless fine-sand-controlling technology of fiber-resin sand complex was developed, which includes fiber-complex technique, clear fracturing fluid technique and TSO technique. The technology was applied to 12 wells in the Sebei gas field and good results were gained in sand control. After the sand control treatment, sand production stopped and the gas production rate was up to more than 1.75 times.
  • 资源评价与管理
  • ZHANG Yongfeng; YANG Shufeng; JIA Chengzao; CHEN Hanlin; HU Suyun and LI Xiaodi
    , 2006, 33(1): 1248-0.
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    The theory of real option derived from the financial world could better take into account the financial value of adaptability and strategy of the petroleum exploration and development projects. The commercial strategy sequence of oil companies managing the petroleum exploration and development projects is a kind of option activity. The characters of real options of the petroleum exploration and development projects are analyzed, and the reason and mechanism of applying the real options method in the economic evaluation of the projects are discussed in this paper. Also discussed are the connotations of abandonment option and shutdown option. Example analysis is provided to demonstrate the evaluation efficiency. In the economic evaluation of the petroleum exploration and development projects with high risks and many uncertainties, the real option method allows to evaluate the project in each separate stage. The investors may choose to continue or stop the project according to the progress conditions, while the conventional cash flow method does not allow to stop the project during the process, which may misdirect the investment. The real option method may help to enhance the economic value and accuracy of decision making of the petroleum exploration and development projects.
  • 国际交流与合作
  • LUO Xiaoping; SHEN Zhongmin; HUANG Fei and LIN Renzi
    , 2006, 33(1): 1249-0.
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    The crude oil in the heavy oil reservoir of the Sajia uplift zone in M Basin,Sudan, is typically generated in a continental basin. The crude oil is of lower maturity and with lower concentration of C29TS and C30-diahopane in m/z 191 .The distribution of C27,C28,C29 sterane is in the letter "V"form. The circumstance of source rock is fresh water sedimentation,and the organic matter of source rock is composed of terrestrial organic matter and aquatic organism. The oil maturity degree of inclusion is lower than that of pore-oil of sandstone and the source rock is dominated by terrestrial organic matters. The crude oil begins infilling into the sandstone of A.G. in late Dar episode and the primary period of forming oil reservoir is in the Amal period (55-80Ma). The end of Amal (50-55 Ma) is the primary period of forming the heavy oil pool of Dar, and the major reason is that the light parts of crude oil were dissipated.