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Petrophysical and capillary pressure properties of the upper Triassic Xujiahe Formation tight gas sandstones in western Sichuan,china

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petroleum Science 2011年第1期8卷 34-42页

作者： Ye Sujuan Lu Zhengxiang Li Rong exploration and production Research {2. Sinopec Southwest CompanySichuan 610081China Chengdu institute of Geology and Mineral Resources Sichuan 610081China

The tight sandstones of the Upper Triassic Xujiahe Formation（T_3x） constitute important gas reservoirs in western *** Xujiahe sandstones are characterized by low to very low porosity （av.5.2.%and 3.62.） for the T_3x^4 and T_3x^2.sandstones,respectively）,extremely low permeability（av. 0.060 mD and 0.058 mD for the T_3x^4 and T_3x^2.sandstones,respectively）,strong heterogeneity,micronano pore throat,and poor pore throat *** a result of complex pore structure and the occurrence of fractures,weak correlations exist between petrophysical properties and pore throat size,demonstrating that porosity or pore throat size alone does not serve as a good permeability *** improved correlations can be obtained between permeability and porosity when pore throat radii are incorporated. Correlations between porosity,permeability,and pore throat radii corresponding to different saturations of mercury were established,showing that the pore throat radius at 2.%mercury saturation（R_（2.）） is the best permeability *** regression analysis and artificial neural network（ANN） methods were used to establish permeability prediction models and the unique characteristics of neural networks enable them to be more successful in predicting permeability than the multivariate regression *** addition, four petrophysical rock types can be identified based on the distributions of R_（2.）,each exhibiting distinct petrophysical properties and corresponding to different flow units.

关键词： Western Sichuan upper Triassic Xujiahe Formation tight sandstones permeability porosity pore throat radius regression analysis artificial neural network

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Geological evolution of the Dongsha Uplift and its surrounding depressions in the South china Sea

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Acta Oceanologica Sinica 1989年第4期8卷 559-564页

作者： Li Desheng and Jiang Renqi Research institute of petroleum {2. and Development , P. O. Box 910. beijing 100083, china Res Inst petroleum exploration & Dev PO Vox 910 Beijing 100083 China

-The tectonic types of the Zhujiang (Pearl) River Mouth Basin in the South china Sea are epicontinental rift-depression basins. Prior to Early Cretaceous time, the Dongsha Uplift arid its surrounding depressions had been combined with the Eurasia Plate in a single unit. Many ENE-trending narrow rifted basins were formed in the third episode of Yanshan orogeny (Late Laramide). The rifted basins in the Paleocene and Eocene were stretched and extended, forming Zhu 1, Zhu 2.and Zhu 3 depressions. The Dongsha Uplift is located between Zhu 1 and Zhu 2.depressions . covering an area of 2. 000 Km2. Its geologic evolution can be divided into four stages:(1) Late Cretaceous - Paleocene block-faulting stage.(2. Eocene -Oligocene uplifting and eroding stage.(3) Late Oligocene - Early Miocene sustained subsiding stage.(4) Middle Miocene -Recent noncompensated subsiding *** Dongsha Uplift is a structural zone favourable for oil-gas accumulation.

关键词： Geological evolution of the Dongsha Uplift and its surrounding depressions in the South china Sea

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Multiphase tectonic movements, cap formations and evolution of the Majiang paleo-reservoir

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petroleum Science 2011年第2期8卷 127-133页

作者： Tang Liangjie Cui Min State Key Laboratory of petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China CNOOC Research institute Beijing 100027 China

The Majiang paleo-reservoir is a typical destroyed hydrocarbon reservoir, buried in carbonate strata of china＇s southern marine-facies. Field geological explorations, interpretations of seismic profiles and balanced cross-section restorations around this paleo-reservoir reveal that its formation and evolution have been restricted by multiphase tectonic movements of different intensities. A regional tectonic mechanism and model have been suggested for the formation and evolution of the Majiang paleo- reservoir. Geological field exploration has been carried out along three typical Silurian cross-sections and rock samples were tested in combination with water-rock interaction. Based on the result of cap tests, the planar distribution, the residual thickness, the erosion thickness and the preservation conditions, the Silurian mudstone cap is discussed around the Majiang paleo-reservoir. Combining the hydrodynamic conditions of its formation and evolution and its tectonic movements, we determined the fact that the thicker the cap is, the more resistant it is to hydrodynamic destruction. The multi-phase formation and destructive geological model of the paleo-reservoir is established through an overall analysis of multi- phase tectonic evolutions, cap developments, hydrodynamic conditions and solid mineral metallogenic ages measured by Rb-Sr, Pb and Sm-Nd isotope techniques.

关键词： Multiphase tectonic evolution key tectonic changes cap evolution hydrocarbonpreservation Majiang paleo-reservoir

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Total alkyl dibenzothiophenes content tracing the filling pathway of condensate reservoir in the Fushan Depression,South china Sea

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Science china Earth Sciences 2008年第S2期51卷 138-145页

作者： LI MeiJun1,WANG TieGuan1,LIU Ju2.ZHANG MeiZhu2.LU Hong3,MA QinLin2.& GAO LiHui2.1 State Key Laboratory of petroleum Resources and Prospecting,Earth Sciences and Geoinformatics School,china University of petroleum,beijing 102.49,china 2.Southern Oil exploration and Development Company,Petrochina,Guangzhou 510640,china 3 Guangzhou institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 5102.0,china china Univ Petr Earth Sci & Geoinformat Sch State Key Lab Petr Resources & Prospecting Beijing 102249 Peoples R China Petrochina So Oil Explorat & Dev Co Guangzhou 510640 Peoples R China Chinese Acad Sci Guangzhou Inst Geochem Guangzhou 510240 Guangdong Peoples R China

The condensates are generally characterized by high maturity,low concentration of steranes and ter-panes biomarkers and low content of non-hydrocarbon fraction. In this case commonly used steranes,terpanes and carbazoles parameters cannot be effectively applied in the reservoir-filling tracing. The hydrogen bond formed by sulfur atom in the dibenzothiophenes (DBTs) results in molecule adsorption and fractionation during oil migration in reservoir. Like carbazoles,total DBTs content decreases with the increasing of oil migration distance. Therefore,a new parameter——total DBTs content is proposed to be used to trace the oil migration orientation and filling pathway. In present study,total DBTs con-tents of condensates and light oils are obtained by adding internal standard——eight deuterium atoms substituted DBT during Gas Chromatography-Mass Spectrometry analysis of aromatic fraction. Except for a few samples with much lower content of non-hydrocarbon fraction,the total DBTs content shows a fine positive correlation with that of carbazoles. Large errors can be caused in the process of pyrrolic nitrogen compounds separation. The application of this new parameter in the Fushan Depression of Beibu Gulf Basin,South china Sea indicates that this parameter is a reliable one to trace filling pathway in condensate reservoirs. Combined with other DBTs-related parameters,such as 4-/1-methydibenzo-thiophene and 2.4-/1,4-dimethyldibenzothiophene,oil migration orientation and filling pathway of the Fushan Depression was determined. The accumulations of Huachang oil field in the Fushan Depres-sion are mainly migrated and charged from northeast to southeast along the Huachang uplift. It can be predicated that the light oil and condensates in the Huachang oil field should be sourced from the source kitchen at the Bailian Sag. It shows that total DBTs content is an effective parameter to tracing oil migration orientation and filling pathway.

关键词： dibenzothiophene alkyl dibenzothiophene condensate reservoir filling pathway molecular markers the Fushan Depression

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Numerical simulation of pore-scale flow in chemical flooding process

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Theoretical & Applied Mechanics Letters 2011年第2期1卷 68-72页

作者： Xiaobo Li,~(1,a) Shuhong Wu,~1 Jie Song,~1 Hua Li,~1 and Shuping Wang~2.1.Research institute of petroleum {2. & Development of Petrochina,beijing 100083,china 2.petroleum {2. & production Research institute of sinopec,beijing 100083,china Research institute of petroleum {2. & Development of Petrochina Beijing 100083 China petroleum exploration & {2. Research institute of sinopec Beijing 100083 China

Chemical flooding is one of the effective technologies to increase oil recovery of petroleum reservoirs after water *** the scale of representative elementary volume(REV), phenomenological modeling and numerical simulations of chemical flooding have been reported in literatures,but the studies alike are rarely conducted at the pore-scale,at which the effects of physicochemical hydrodynamics are hardly resolved either by experimental observations or by traditional continuum-based *** this paper,dissipative particle dynamics(DPD),one of mesoscopic fluid particle methods,is introduced to simulate the pore-scale flow in chemical flooding *** theoretical background,mathematical formulation and numerical approach of DPD are *** plane Poiseuille flow is used to illustrate the accuracy of the DPD simulation,and then the processes of polymer flooding through an oil-wet throat and a water-wet throat are studies, *** selected parameters of those simulations are given in *** preliminary results show the potential of this novel method for modeling the physicochemical hydrodynamics at the pore scale in the area of chemical enhanced oil recovery.

关键词： chemical flooding pore-scale flow dissipative particle dynamics mesoscopic simulation enhanced oil recovery

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Limitation of fault-sealing and its control on hydrocarbon accumulation——An example from the Laoyemiao Oilfi eld of the Nanpu Sag

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petroleum Science 2008年第4期5卷 295-301页

作者： Jiang Zhenxue Dong Yuexia Li Hongyi Liu Luofu Liu Guangdi Li Xiaoying Basin and Reservoir Research Center China University of Petroleum Beijing 102249 China State Key Laboratory of petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China Research institute of exploration and Development Jidong Oilfield PetroChina Tangshan Hebei 063004 China School of Resources and Information Technology China University of Petroleum Beijing 102249 China

Based on previous studies on the internal structures of fault belts, the fault belts in the Laoyemiao Oilfield of the Nanpu Sag can be divided into three units, a crushed zone, an upper induced fracture zone and a lower induced fracture zone according to the log response characteristics. The upper induced fracture zone is characterized by the development of pervasive fractures and has a poor sealing or non-sealing capability. It therefore can act as pathways for hydrocarbon migration. The lower induced fracture zone consists of fewer fractures and has limited sealing capability. The crushed zone has a good sealing capability comparable to mudstone and can thus prevent lateral migration of fluid. Through physical modeling and comparing laboratory data with calculated data of oil column heights of traps sealed by faults, it is concluded that the fault-sealing capability for oil and gas is limited. When the oil column height reaches a threshold, oil will spill over from the top of reservoir along the lower induced fracture zone under the action of buoyancy, and the size of reservoir will remain unchanged. Analysis of the formation mechanisms of the fault-sealed reservoirs in the Nanpu Sag indicated that the charging sequence of oil and gas in the reservoir was from lower formation to upper formation, with the fault playing an important role in oil and gas accumulation. The hydrocarbon potential in reverse fault-sealed traps is much better than that in the consequent fault-sealed traps. The reverse fault-sealed traps are favorable and preferred exploration targets.

关键词： Limitation of fault-sealing fault belt oil column height hydrocarbon accumulation Nanpu Sag

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Structural characteristics of the Tan-Lu fault zone in Cenozoic basins offshore the Bohai Sea

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Science china Earth Sciences 2008年第S2期51卷 20-31页

作者： QI JiaFu1,2.ZHOU XinHuai3,DENG RongJing4 & ZHANG KeXin2.1 State Key Laboratory of petroleum Resource and Prospecting,china petroleum University,beijing 102.49,china 2.Department of Earth Sciences,china petroleum University,beijing 102.00,china 3 Tianjin Branch of CNOOC china Limited,Tianjin 300451,china 4 beijing Research Center of CNOOC china Limited,beijing10002.,china china Petr Univ State Key Lab Petr Resource & Prospecting Beijing 102249 Peoples R China china Petr Univ Dept Earth Sci Beijing 102200 Peoples R China CNOOC china Ltd Tianjin Branch Tianjin 300451 Peoples R China CNOOC china Ltd Beijing Res Ctr Beijing 100027 Peoples R China

The Tan-Lu fault zone across the eastern margin of the Cenozoic basins offshore the Bohai Sea is a NNE-trending right-lateral strike-slip fault system developed in the Cenozoic basin cover. It cuts through NE-to NNE-striking major extensional faults that controlled the formation of Paleogene basins. Recent petroleum exploration indicates that Cenozoic structural activities of the Tan-Lu fault system have directly or indirectly affected oil and gas distribution offshore the Bohai Sea. As part of a deep fault zone the Tan-Lu fault zone has been activated since the Oligocene,and obviously affected the tectonic evolution of offshore Bohai basins since then. The formation of Paleogene rift basins offshore the Bohai Sea has utilized the pre-existing structural elements of the Tan-Lu fault zone that developed in the late Mesozoic.

关键词： strike-slip fault extensional structure Tan-Lu fault zone Bohaiwan basin

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Investigation of Mechanical Property of Oil Tube Steel P110S in High Temperature and High Pressure Environment Containing H_2./CO_2

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Journal of Iron and Steel Research International 2011年第S1期18卷 685-689页

作者： LI Xiao-dong 1,QI Ya-meng 2.CHEN Chang-feng 2.DONG Xiu-cheng 1 (1.School of Business Administration,china University of petroleum({2.),{2. 102.49,china 2.College of Science,china University of petroleum({2.),{2. 102.49,china) china Univ Petr Sch Business Adm Beijing 102249 Peoples R China china Univ Petr Coll Sci Beijing 102249 Peoples R China

With the exploitation of high sour and deep oil well in china,the corrosion medium containing CO 2.H 2.S,Cl-and organic acid threaten the safety of oil equipment and tube steel *** this article,many experiments,including corrosion tests,tensile tests,hydrogen concentration measurement tests and SEM examinations,were performed to investigate the effect of H 2.S partial pressure and loading stress on the mechanical property of oil tube steel P110S in high temperature and high pressure environment containing H 2.S/CO *** tensile strength and yield strength during fracture process of P110S steel were obtained experimentally and the fracture morphology was analyzed by *** results indicate that both tensile strength and yield strength decreased after *** damage of tensile strength and yield strength became serious with an increase in H 2.S partial pressure and loading *** to the fracture analysis,the fracture mode exhibited quasi-cleavage and dimple mixed fracture,and the area of quasi-cleavage pattern increased with H 2.S partial pressure and loading stress *** to the results of tensile test and hydrogen concentration measurement test,the tensile property degradation is closely associated with diffusible hydrogen concentration of P110S steel in the H 2.S/CO 2.environment.

关键词： metallic tension P110S diffusible hydrogen H 2.S/CO 2.corrosion

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The productivity evaluation model and its application for finite conductivity horizontal wells in fault block reservoirs

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petroleum Science 2010年第4期7卷 530-535页

作者： Jiang Hanqiao Ye Shuangjiang Lei Zhanxiang Wang Xing Zhu Guojin Chen Minfeng Key Laboratory of petroleum Engineering Ministry of Education China University of Petroleum Beijing 102249 China Research institute of petroleum {2. and Development PetroChina Beijing 100083 China Research institute of china National Offshore Oil Corporation Beijing 100027 China

It is very difficult to evaluate the productivity of horizontal wells in fault block reservoirs due to the influence of fault *** the basis of the method of images and source-sink theory,a semianalytical model coupling reservoir and finite conductivity horizontal wellbore flow dynamics was built,in which the influence of fault sealing was taken into *** distribution of wellbore flow and radial inflow profiles along the horizontal interval were also *** impact of the distance between the horizontal well and the fault on the well productivity was quantitatively *** on this analysis,the optimal distance between the horizontal well and the fault in banded fault block reservoirs could be *** to the field application,the relative error calculated by the model proposed in this paper is within ±15%.It is an effective evaluation method for the productivity of horizontal wells in fault block *** productivity of the horizontal well increases logarithmically as the distance between the horizontal well and the fault *** optimal distance between the horizontal well and the fault is 0.2.-0.3 times the horizontal well length.

关键词： Fault block reservoir horizontal well finite conductivity productivity evaluation well location design

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Experimental study of gas-water elongated bubble flow during production logging

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petroleum Science 2011年第2期8卷 157-162页

作者： Lu Jing Wu Xiling Key Laboratory of Earth Prospecting and Information Technology China University of Petroleum Beijing 102249 China State Key Laboratory of petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China

In order to improve the interpretation of production log data on gas-water elongated bubble （EB） flow in horizontal wells, a multi-phase flow simulation device was set up to conduct a series of measurement experiments using air and tap water as test media, which were measured using a real production logging tool （PLT） string at different deviations and in different mixed flow states. By understanding the characteristics and mechanisms of gas-water EB flow in transparent experimental boreholes during production logging, combined with an analysis of the production log response characteristics and experimental production logging flow pattern maps, a method for flow pattern identification relying on log responses and a drift-flux model were proposed for gas-water EB flow. This model, built upon experimental data of EB flow, reveals physical mechanisms of gas-water EB flow during measurement processing. The coefficients it contains are the specific values under experimental conditions and with the PLT string used in our experiments. These coefficients also reveal the interference with original downhole flow patterns by the PLT string. Due to the representativeness that our simulated flow experiments and PLT string possess, the model coefficients can be applied as empirical values of logging interpretation model parameters directly to real production logging data interpretation, when the measurement circumstances and PLT strings are similar.

关键词： Horizontal wells elongated bubble flow flow patterns identification drift-flux model,logging interpretation model

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