, Volume 31 Issue 7
    

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  • Influence factors of oil displacement efficiency and sweep efficiency in chemical flooding
    SHEN Pingping; YUAN Shiyi; DENG Baorong; SONG Jie and SHEN Kuiyou
    , 2004, 31(7): 974-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    On the basis of quantitative description of the sweep effi-ciency and oil displacement efficiency of a serious heterogeneousreservoir, a series of normal rhythm 2D section geologic models areestablished and the effect of different reservoir heterogeneity on oildisplacement efficiency and sweep efficiency in chemical flooding is investigated by using chemical simulator ASP 2.0 developed byRIPED, PetroChina. If the thickness ratio of the high permeability formation to the general reservoir changes with same permeability difference between layers, then the oil displacement efficiency of polymer flooding and Alkali/Surfactant/Polymer (ASP) flooding is different. The effect of gravity on the oil displacement efficiency of ASP flooding is studied, suggesting that reducing the producer-in- jector spacing could decrease the gravity effect and the oil displace-ment efficiency of ASP flooding for different geological models makegreat difference. It is important to study the reservoir adjustability of ASP flooding and polymer flooding for improving the recovery after water flooding.
  • Synergism of the model oil system of surfactant/brine/methyl oleate
    CHU Yanping; ZHANG Lu; WANG Lin; ZHAO Sui and YU jiagong
    , 2004, 31(7): 975-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The synergism for lowering interfacial tension between surfactant molecules and organic additives in model oil, such as car- boxylic acids, octadecanol and surface-active fractions in crude oil had been studied based on the influence of oil phase and aqueous phase on the interfacial adsorption of surfactants with hydrophilic-lipophilic ability. The methyl oleate in oil phase influenced the inter-facial surfactant concentration and interfacial tension by changing the distribution of added surfactant in oil phase and aqueous phase.Synergismlantagonism between added surfactants with different struc-lure and organic surface-active components in oil phase can be ob-served with increasing methyl oleate concentration in oil phase, which is in close relationship with aqueous phase. The empirical equation,which can judge synergism or antagonism, had also been provided.The results obtained from empirical equation were in very good agree-ment with the experimental data.
  • Relationships between structure to properties of alkylbenzene sulfonate surfactants and FOR
    ZHU Youyi; SHEN Pingping; QU Jingkui and WANG Guofang
    , 2004, 31(7): 976-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Interfacial tensions at model oil/water interface and crude oil/formation water interface were studied by synthesizing a serious of alkylbenzene sulfonate surfactant with different structures. The tests show that the molecular structure, such as carbon length, differ-ent substituent group and position of benzene ring, exerts a great effect on interfacial property. The prescription of combination flood-ing in weak alkali condition is gained for wax-based crude oil andmiddle-based crude oil.
  • Effect of different additives on the precipitating behavior of anionic surfactant and multivalent cation
    LIAO Lin; ZHAO Sui; ZHANG Lu; CHEN Tiefeng and YU jiagong
    , 2004, 31(7): 977-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The precipitating behaviors of anionic surfactant and mul- tivalent canon at different conditions were studied by means of light transmission measurement. The results show that by adding different additives, anionic surfactant and multivalent canon displayed differ-ent precipitating behaviors. When the concentration of Ca2+ was 1.0×10-3 mol/L, less amount of precipitate formed as the increase of NaCl concentration, and when the NaCI concentration was O.lmol/L, no precipitate existed. The precipitating behaviors of anionic sur- factant and multivalent ion also changed with the change of pH. If EDTA was added, less surfactant precipitate was formed because of the chelation between EDTA and Ca2+. When the EDTA concentra- lion was O.Olmol/L, no precipitate existed, suggesting that adding nonionic surfactant TX-100 could inhibit the formation of surfactant precipitate. When the molar content of nonionic surfactant was 10%, there was almost no precipitate.
  • Synthesis of alkylbenzene sulfonate surfactants used for ASP combination flooding
    ZHU Youyi; SHEN Pingping; WANG Zhe; WANG Guofang and YANG Changqing
    , 2004, 31(7): 978-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Synthesis of alkylbenzene sulfonate surfactant using heavy-alkylbenzene as raw materials and SO, as sulphonating agents are introduced. Many factors affecting the performance of alkylbenzene sulfonate surfactant such as component of raw materials, reaction temperature and molar rate of raw materials on sulphonating reac-lion were discussed. Based on laboratorial investigations, scale-up test is conducted. The core displacement test of ASP combination flooding in laboratory shows that the displacement efficiency of ASP flooding with alkylbenzene sulfonate surfactant is 20% higher thanthat of the conventional waterfooding.
  • Effect of FOR chemicals on interfacial dilational properties of active constituents in crude oil
    LUO Lan; ZHANG Lu; Fang Hongbo; WANG Yiyang; ZHAO Sui and YU Jiayong
    , 2004, 31(7): 979-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The effect of chemicals in FOR system, such as salt,polymer, alkali and surfactant, on interfacial dilatational viscoelas-ticity behaviors of decane-water interfaces formed of surface active constituents, which were distilled by supercritical fluid extraction and fractionation (SFEF) method from Iranian heavy oil. were inves-tigated by the methods of sinusoidal oscillation and interfacial relaxation, suggesting that with the addition of polymer or alkali, the dilatational properties of interfacial film containing crude oil con-stituents changed obviously and the phase angles were negative in some cases. The mechanism responsible for negative phase angle is also discussed.
  • Dilational properties of interfacial film in FOR by interfacial tension relaxation method
    FANG Hongbo; LUO Lan; ZHANG Lu; WANG Yiyang; ZHAO Sui and YU Jiayong
    , 2004, 31(7): 980-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The effects of chemicals in FOR system, such as polymer,sodium lauryl benzene sulfonate and alkali, on interfacial dilational viscoelasticity behaviors of decane-water interfaces were investigated by the method of interfacial tension relaxation. It showed that the slow relaxation processes with characteristic time of l03s orders ap-peared with the addition of polymer or alkali. The elasticity of film increased with the appearance of slow relaxation processes.
  • Viscosity model of oil emulsion in chemical flood-ing
    SANG Jle and ZHU Bin
    , 2004, 31(7): 981-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    With the development of pilot test in synergistic chemical flooding, much attention were paid on that the non-Newtonian and thermodynamically unstable emulsion flow may potentially affect the process of the reservoir numerical simulation. Based on the study of many available literatures, viscosity models of emulsion liquid used in numerical simulation for chemical combination flooding are developed, including the viscosity-water content model, the viscos-ity-shear rate model and the viscosity-water content-shear rate model, showing that the viscosity of emulsion liquid produced in chemical flooding will be affected by many factors, in which the water content (or oil content), shear rate and the temperature are most important.The viscosity equations of emulsion flow will be different under dif-ferent conditions of water content. The viscosity of emulsion would be suddenly drawdown when the water cut is greater than its critical point, in which there is observable emulsion invert from water in oil to water in oil. Based on this research, the viscosity models, corre-sponding to different phases of water content, of oil emulsion used in mathematical model of chemical flooding processes are developed.
  • Studies of dynamic contact angle
    GUO Tongcui; LIU Mingxin; XIONG Wei; ZENG Ping; KONG Liping; LUO Caizhen and ZHAO Zhiguo
    , 2004, 31(7): 982-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Study of dynamic contact angle is the fundament of per-colation law research, and is important for choosing the method of FOR and reservoir modeling. The domestic and overseas researches of dynamic contact angle are summarized. The relationships between contact angle and displacing velocity, liquid capillary number, and viscous ratio are studied overseas based on molecular theory and dynamics. The experiment reveals that the cosin difference of the dynamic contact angles is linear to the displacing velocity in lower displacing velocity; and the tan dynamic contact angles is linear to the displacing velocity in higher velocity. Surfactant could decrease the contact angle of liquid-liquid interface and increase the hyster- esis of contact angle. The roughness of the solid surface has little influence on the dynamic contact angle. In China, most investigators study dynamic contact angles by experiment, in which wettability dashboard experiments in gas-water and gas-oil system show linear relation between cosin advancing contact angle and displacing velocity, two-segment linear relationship between cosin receding con- tact angle and displacing velocity and the line slop ofhigher displac- ing velocity is bigger than the lower displacing velocity.
  • Adsorption coefficient of solid mote in suspen-ding fluid
    QIN Jishun; SHEN Pingping; CHEN Xinglong and WANGanwe
    , 2004, 31(7): 983-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    As the analysis solution of the adsorption equation is dif-ficult to find, the adsorption coefficient is regarded as constant in the solution. For suspension, adsorption has further influence on core displacement than diffusion. So adsorption coefficient treated as con-slant would cause distortion. A mathematical model is established for the system of suspension, and a method that combines numerical stimulation with experiments is presented, in which only the average concentration of the fluid is needed, the adsorption coefficient could be fitted by adjusting the parameters, as a result, the error of experi-menu is cut down. In the system, the linear change of adsorption coefficient with time and adsorption extent is considered, and the initial value of the adsorption coefficient could be deduced. The model can simulate the concentration of the suspension in the different po-sition at random time. The accuracy and practicability of the methodare verified by experiments.
  • Oil-water relative permeabilities of low-tensionsystem
    LI Xianbing; LIU Li and ZHU Bin
    , 2004, 31(7): 984-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Water-oil relative permeability, related to all two-phase flow properties, characterizes two-phase flow and displacement pro-cesses in porous media. The relative permeability is inherently complicated, and its tunctional form is difticult to be determined in aparticular reservoir study. The adding of various chemical agents intothe displacing aqueous phase during alkaline-surfactant-polymer combination chemical flooding significantly changes interfacial tension (σ)of water-oil interfaces, and also increases the degree of difticulty in measuring such changes in the laboratory. To overcome the limitations of the existing laboratory measurements of relative permeability, which are applicable only for high ranges of interfacial tension (e.g.,σ> 10-2 mNlm), a comprehensive experiment of two- phase relative-permeability functions in much lower, realistic inter-facial tension water-oil systems is presented, including an improved steady-state method of measuring water-oil relative permeability curves; a critical interfacial tension value σc (or the critical capillarynumber Nc1 and Nc2)exists such that interfacial tension has littleimpact on relative permeability for σ>σc1，while if 6<6c? relative permeability to both water and oil phases will increase with decreas-ing interfacial tension; a logarithmic relation exists between water-oil two-phase relative permeability and interfacial tensions. The ex-periment and proposed conceptual models should be useful for feasi-bility studies, optimal designs, and numerical simulations of differ-ent chemical flooding operations in oil reservoirs.
  • Emulsion microstructure from digital image analysis technique
    ZHU Bin and HONG Ying
    , 2004, 31(7): 985-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The fonnation. production and handling of highly viscous petroleum-emulsion are significant problems in the operation of many heavy oil thermal stimulation and EOR projects. During the 1980s to 1990s, the ASP combination flooding for EOR studies were conducted in Daqing, Shengli and Karamay Oilfield. As is now well known that most enhanced oil recovery processes involve the fonnation and flow of emulsion and this emulsion produced from ASP flooding was strongly non-Newtonian. The digital image analysis technique and optical microscopy were used to study the non-Newtonian emulsion characterization by calculating the droplet size distribution of the dispersed phase in the pictures. The rheological properties were measured using a concentric cylinder rotary rheometer. Results show that the emulsion rheological behavior is as a function of composition, droplet size distribution，and the rate through porous media.
  • Reservoir simulation of chemical flooding by dynamically tracking the displacement fronts
    LI Jianfang; YUAN Shiyi; SONG Jie; DENG Baorong and SHEN Kuiyou
    , 2004, 31(7): 986-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Fast Adaptive Composite Grid (FAC) is applied to dynamically tracking chemical flooding fronts and implemented in existing chemical reservoir simulator ASP (alkali/surfactant/ polymer) developed by RIPED, PetroChina. Local grid refinements with less grid blocks and over 50% less computer time than global refinement over the whole domain can be moved and visualized as displacement fronts change without loss of quality and accuracy. With chemical flooding reservoir simulations utilizing proposed FAC method, water cut curves, water breakthrough time and oil saturation contour maps are compared in the three grid systems(global coarse grid system, global fine grid system and composite grid system).The numerical experiments also show that chemical flooding reservoir simulation is sensitive to its grid sizes and it is essential to adopt the global refinement over the whole domain or dy namic local gridy refinement.
  • Experiment technology of consolidated reservoir model
    ZHANG Hongxin; WANG Jian; LIU Sizhou and CHEN Yaning
    , 2004, 31(7): 987-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A series of petrophysical modeling experiment technolo-gies is established, utilizing a large scale artificial consolidated model,to research the mechanisms of fluid flow in porous media and EOR.This petrophysical model was sealed by epoxy resin, and then placed into a large pressure cabin with maximum operation pressure of 3 MPa. Fifty pressure points and 40 resistance points were designed and arranged to detect and measure pressure and resistance value.Two electrical balances were utilized to record the yield fluids. This system can be controlled automatically by two computers. A long term test including modeling water saturating, displacement water by oil and displacement oil by water can be carried through with thissystem and technology.
  • ASP flooding experiments of positive rhythm rock models
    YANG Qingyan; LIAO Guangzhi; GONG Wenchao; JIA Zhongwei and LI Binhui
    , 2004, 31(7): 988-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    An ASP flooding experiment was conducted on man-made rock model to simulate two-dimension vertical heterogeneous positive rhythm reservoir. The man-made rock model was made up of three single man-made rock samples which were connected parallelly. In the experiment, produced oil and water were measured separately. Base on the experimental results, a synthetic analysis was used to reveal the water cut differences, the produced fluid percent, oil recovery factor and vadose mechanism of the vertical areas before and after the ASP flooding. Using the two-dimension vertical heterogeneous positive rhythm man-made three-layer rock samples, ASP flooding and water flooding comparative experiments were also progressed.After the experiments, cut open the rock samples and took the sectional view into the computer, then use the color image analysis system to get the oil saturation profile data. The increased oil displacement efficiency and the enhanced conformance efficiency by the ASP flooding were synthetically analyzed. Water-oiI mobility control and crude oil emulsions of the ASP flooding can reduce the contradicdons among the layers and improve the oil recovery by a large extent,and the extent of oil recovery enhanced by the medium permeable layer is highest among three layers.Average oil recovery from the increased oil displacement efficiency is 55.75%.
  • Experimental investigation of CDG fluid in he-terogeneous physical model
    YUE Xiaoyun and WANG Jialu
    , 2004, 31(7): 989-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Experimental investigation has been conducted on CDG (Colloidal Dispersion Gels) fluid in heterogeneous physical model,the effects of water flooding, polymer flooding and CDG flooding on FOR are systematically compared. Pressure transducers with high accuracy were installed in the model, and the fluid flow variation in the reservoir was observed. The tests show that polymer flooding enhanced oil recovery 8.7% more than water flooding, and 1.6% more than polymer flooding. According to pressure variation, it is clear that the fluid flow direction could be changed by polymer flooding, expanding sweep region and displacing oil from the low permeabil-ity regions. After CDG became colloid, the high permeability regionscould be plugged, the fluid flow direction changed and oil recoveryenhancement would be achieved.
  • Saturation measurement technique for 3D re-servoir physical modeling
    SHEN Pingping; WANG Jialu; TIAN Yuling and ZHANG Zubo
    , 2004, 31(7): 990-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The one-dimension saturation measuring technique focuseson the measurement of the saturation distribution in core cross section.Two-dimension visible physical modeling and microscopic physical modeling focus on the observation of flow mechanism in porous media. While the saturation measuring technique used in tree-dimen-sion reservoir physical modeling is not available in the world. The micro-probes were made by means of double press model technology,antioxidant and anticorrosive materials with electric resistivity theory,which can measure the saturation variation in the reservoir physical model. Technical vacancy of the same field is filled by this technique.Saturation changes at different positions in primary drainage and water flooding processes in different experiments of one-dimension physi-cal modeling are measured. The saturation of the output end face of the model calculated by Buckley-Levertt function is compared with the saturation at the position near the output end face measured by the probe. The agreement between experimental and theoretical re-suits identifies that the method is feasible to measure the saturation variation in physical model in case of primary drainage and water flood. The measuring results with the probe in different experiments are basically the same, the results are stable. Through the results of measured saturation in three different positions with the measuring probe, the formation and development and movement of oil wall canbe observed quantitatively. The saturations of water in three posi-tions increase greatly after polymer flooding. For one-dimension model, only when the oil wall moves to the output section does watercut falls and recovery increases greatly.
  • Multiple subject comprehensive studies on im-proving reservoir forecast level, Daqing Oilfield
    ZHANG Yongqing; CHEN Shuwei; QU Yonghong; ZHANG Wenqing and LI Yuun
    , 2004, 31(7): 991-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The Daqing Oilfield is faced to a severe situation of future development, and multiple-subject integration is needed to enhance the oil recovery, the multiple-subject study supplies a practical means for fine reservoir description and prediction. The Pu I Formation, west to the east block of north area 1, Sazhong Oilfield, is used as an example of application of the methods of fine contrast of high reso-lution sequence, quantitative flow unit description, reservoir model-ing controlled by the sedimentary micro-fades and reservoir numerical simulation. The quantitive inhomogeneity of river-delta reservoirs is revealed by the method, and the fine reservoir description and pre-diction technology is improved
  • Variation of physical characteristics and wettability of the reservoir in high water-cut stage
    ZHU Lihong; DU Qinglong; LI Zhongiang; YU Hong and SONG Xiaochuan
    , 2004, 31(7): 992-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The physical characteristics and wettability of different reservoir varies evidently with the increasing of water flooding re-covery in Daqing Oilfield. The variations influence the development and adjustment measures of the oilfield. Using the cored wells data of past years, well logging data in different period of same well sites and the laboratory core data, the variation of physical characteristics (porosity and permeability) and wettability of the reservoir are studied. The elements that influence the physical characteristics and wettability are also studied. After the water flood of the reservoir, the variation of porosity is not obvious, whereas the change of permeability isapparent. The variation of the permeability increases with the increase of thickness of the reservoir. The wettability of the rocks changes from the original slightly heterogeneous oil wet to slightly heteroge-neous water wet.
  • Braid river sandbody shape forecast by numeri-cal simulation method
    ZHANG Chunsheng; LIU Zhongbao; SHI Dong; XIAOLing; SUN Hefeng and CHEN Ge
    , 2004, 31(7): 993-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    An ASP flooding experiment was conducted on man-made rock model to simulate two-dimension vertical heterogeneous positive rhythm reservoir. The man-made rock model was made up of three single man-made rock samples which were connected parallelly. In the experiment, produced oil and water were measured separately. Base on the experimental results, a synthetic analysis was used to reveal the water cut differences, the produced fluid percent, oil recovery factor and vadose mechanism of the vertical areas befor...
  • Dynamic geology model establishment of reservoir parameters—taking 12 layer, segment 2 of Shahejie Formation, Shengtuo Oilfield, as an example
    SUN Huanquan; SUN Guo; WU Suying; CHENG Huiming and ZHAO Jiaing
    , 2004, 31(7): 994-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The 12 layer, segment 2 of Shahejie Formation, Shengtuo Oilfield, has been developed by waterflooding for 38 years and the water cut is over 96%, now that the layer is in a super high water cut stage. The changes of the reservoir parameters in different stage of water cut are analyzed based on core information of the inspection wells. The analysis shows that the permeability changes most obviously and the permeability increases with the increase of water cut. The quantitive expression describing the permeability change with water cut is set up through percolation experiments and the variation rules of the reservoir parameters are studied.The dynamic geology model with permeability changing with water cut is established by way of net work quantitive reservoir modelling technique.
  • Stochastic reservoir modeling restricted by geological conditions
    LIAO Xinwei; LI Shaohua and ZHU Yiqing
    , 2004, 31(7): 995-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    There is a failure in using a traditional sequential indicator simulation method to establish reservoir framework models, i,e, some micro-facies may appear in places against geological rules. The reason is that the probability distribution of micro-facies is established by use of global proportion of micro-facies in case of no conditional data, thus all types of micro-facies may appear, which results in the phenomena against geological rules. An improving method is introduced and applied in the Changqing Oilfield.The simulation results obtained from innp roved SISIM method and traditional SISIM methodp are achieved.The result indicates that using improved SISIM method can get a more realistic simulation result.
  • A new method for improving precision of the framework model of braid fluvial sandstone in dense drilling zone
    GUO Yanhua; YUAN Shiyi and SONG Xinmin
    , 2004, 31(7): 996-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A fine geological model is presented based on a high-precision reservoir framework model, and the new technologies including high-resolution sequence stratigraphy, reservoir quantitative simulation technology and the foundation of fine reservoir geological database will be able to provide an important support for improving precision of framework model of sandstones. All kinds of data can be integrated by variation function. This method can apply all kinds of existing information, and improve precision of sandstone forecast between wells，and it will be meaningful for forecasting reservoir distribution in dilute well pattern zone with similar condition.
  • Formation and distribution of remaining oils ingeological bodies of different scales
    DU Qinglong; WANG Yuanqing; ZHU Lihong; LI Zhongfang and NIE Shuyan
    , 2004, 31(7): 997-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Considering the complexity of remaining oil distribution in multi-layer heterogeneous reservoir in high water cut stage, the influential factors, formation, distribution characteristics and genetic type of the remaining oils were studied in the 4 kinds of geological scales (reservoir, formation, intrastratel, and pore space) from mac-roscopic model to microscopic model by physical modeling test, in-spection well data and lease remaining oils analysis, etc. The poten-tial production method each geological body.
  • Determination of reservoir heterogeneity uti-lizing well testing data
    LIAO Xinwei; SHEN Pingping and YANG Yongzhi
    , 2004, 31(7): 998-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The study of reservoir heterogeneity is the basic science of deciding residual oil distribution. Well testing data are responses of production performance, including a lot of dynamic information of reservoir characterization. By the method of inversely analyzing well testing data, reservoir heterogeneity in space and different time can be decided. The distribution of reservoir permeability near the wellbore can be determined more exactly by the improved method of ISA (Inverse Solution Algorithm). The distribution of reservoir per-meability in regional field from several well testing pressure data can be determined by the technology of stochastic modeling. Application in oilfield indicates that the method of deciding reservoir heteroge-neity from well testing data could be a widely appropriate technology
  • Sequence evolution of fan-delta outcrops and its controlling on the sandstone reservoirs
    JIA Ailin; HE Dongbo; GUO Jianlin; HUANG Shiyan and CHEN Liang
    , 2004, 31(7): 999-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The detailed studies of sand body type and distribution of the Luanping fan-delta outcrops and sequence stratification research suggest that the distribution of sand body types and their scales are controlled by the base level cycle. Even if the sandstone bodies be-long to the same type, their thickness and width/thickness ratio will be changed regularly with the rising and falling of the base level. The width/thickness ratio of the off shore channel sandstone bois rela-five large in a high accommodation, and will decrease with the de-cline of accommodation, but the thickness will be increased. Bring in stratigraphic laws and knowledge as restrictions, the stochastic distribution of sand body types and scales can be controlled more effectively and the simulation will be more coupled with real facts.
  • Fine reservoir description by graphic deposition procedure
    HOU Weihong; QU Yonghong; ZHANG Yongqing and LU Xiaoguang
    , 2004, 31(7): 1000-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    High-resolution sequence stratigraphy could be used as a guidance to study the base-level of the Pu I reservoir of West Block, East Fault Block, North Area 1，central Saertu Oilfield. The results suggest that when base-level (A/S)rose, the width, thickness, porosity and permeability of the reservoir decreased, while the variety of deposition facies and the type of non-river flow units increased, and connectivity of flow units decreased. When base-level is in the falling stratigraphic procedure, all the physical properties of these reservoirs changed in the opposite direction to the rising procedure. The different geologic properties of the reservoir can be described and fore-casted on the basis of the stratigraphic procedure. And the het-erogeneous nature of the Daqing Oilfield developed blocks can be described clearly.
  • Effects of signal-to-noise ratio on seismic reser-voir monitoring
    SHI Yumei; LIU Wenlin and YAO Fengchang
    , 2004, 31(7): 1001-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    One of the major factors affecting the ability of seismic reservoir monitoring is seismic data quality. The effect of signal-to-noise ratio on seismic monitoring of water flooding reservoirs with different reservoir thickness and porosity is discussed, and the ro-bustness of amplitude and similarity coefficient is also discussed in time-lapse seismology by using wave simulation and analysis. The results show① the required signal-to-noise ration is same for all of the thin reservoirs with thickness above duodecimal the wavelength;②the lower signal-to-noise ratio is required for reservoir with high porosity than with low porosity for the seismic reservoir monitoring during water flooding;③the square root of reflecting amplitude and the similarity coefficient of wave can heighten the ability of time-lapse seismology;④the similarity coefficient is more robust and more suitable for the seismic reservoir monitoring than the amplitude.
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