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Alkaline diagenesis and its genetic mechanism in the Triassic coal measure strata in the Western Sichuan Foreland basin,china

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petroleum Science 2009年第4期6卷 354-365页

作者： Jiang Zaixing Qiu Longwei Chen Guiju College of Energy China University of GeosciencesBeijing 100083China College of Earth Resources and Information China University of PetroleumShandong 257062China Sinopec Exploration and Production research Institute Beijing 100083China

The reservoir of the upper Triassic Xujiahe Formation (T3x) in the Western Sichuan Foreland basin is a set of terrigenous clastic rocks in an environment of coal measure sediments. Diagenesis greatly controls the physical properties of the reservoir through different responses of minerals to acidic and alkaline diagenetic environment. The dissolution of unstable components such as feldspar, rock fragments, carbonate cement, and clay minerals is the major source of secondary pores under acidic diagenesis, while the dissolution of quartz increases the reservoir space in the fault-fold zone of Longmen Mountain and Leikoupo paleo-hills. The dissolution of quartz is a result of cross-formation flow of fluid in the Himalaya epoch and the invasion of alkaline formation water from the Triassic Leikoupo and Jialingjiang formations through fault and fracture systems. In the vertical succession, acidic dissolution occurs at a shallow depth of less than 2,180 m, and alkaline dissolution occurs at a greater depth of more than 2,280 m. The reservoir space is formed by the influence of both acidic and alkaline dissolution in the depth interval of 2,180–2,280 m.

关键词： Sichuan basin upper Triassic alkaline diagenesis porosity genetic mechanism

High-Resolution Transgressive-Regressive Sequence Stratigraphy of Chang 8 Member of Yanchang Formation in Southwestern Ordos basin,Northern china

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Journal of Earth Science 2010年第4期21卷 423-438页

作者：吕明胜陈开远薛良清衣丽萍朱红涛 research Institute of petroleum Exploration & Development PetroChina School of Energy Resources China University of Geosciences china National Oil and Gas Exploration and Development Corporation Faculty of Earth Resources China University of Geosciences

The reservoirs within the Chang 8 Member of Yanchang(延长) Formation in the southwestern Ordos basin are characterized by low *** is significant to build a high-resolution sequence stratigraphic framework for the exploration and development of these *** on an integrated investigation of well logs,seismic data,cores and outcrops,the Chang 8 Member is interpreted as a 3rd-order transgressive-regressive(T-R) sequence,which consists of six 4th-order T-R sequences,namely,K1,K2,K3,K4,K5 and K6,respectively,from base to *** 4th-order sequence comprises a transgressive systems tract overlain by a regressive systems *** K1 to transgressive systems tract of K4,it is characterized by the landward shifts of facies and overall retrogradational sequence stacking pattern due to accommodation increase more than sediment supply during the 3rd-order base-level *** distributary channels are mainly deposited in the transgressive systems tracts,and the interdistributary bays,sheet sands,and small-scale mouth bars are primarily developed in the regressive systems tracts in response to the 4th-order base-level *** the regressive systems tracts of K4 to K6,it is characterized by the basinward shifts of facies and overall progradational sequence stacking pattern because of accommodation increase less than sediment supply during a fall in 3rd-order base *** distributary channels are mainly accumulated in the transgressive systems tracts,and distributary channels and mouth bars are deposited in the regressive systems tracts as a result of the 4th-order base-level *** stratigraphic and sedimentological analyses indicate that sequences K1,K2,K5 and K6,as well as the basin edge of K3 and K4,remain potential for exploration and development due to their high reservoir quality in response to the low accommodation and more sediment supply.

关键词： transgressive-regressive sequence base level sediment supply sequence stratigraphic framework Ordos basin.

Origin and controlling factors of chlorite coatings—an example from the reservoir of T_3x Group of the Baojie area,Sichuan basin,china

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petroleum Science 2009年第4期6卷 376-382页

作者： Peng Jun1,Liu Jinku2,Wang Yan2 and Liu Jianfeng2 1 Scientific research Department,Southwest petroleum university,Chengdu,Sichuan 610500,china 2 Graduate School,Southwest petroleum university,Chengdu,Sichuan 610500,china Scientific research Department Southwest Petroleum University Chengdu Sichuan China Graduate School Southwest Petroleum University Chengdu Sichuan China

The study of the chlorite coatings always attracts scholars in china and other countries because the chlorite coatings play an important role in the preservation of residual primary pores in sandstone *** present,the study of the origin and the controlling factors is relatively *** occurrence,time of formation,genesis,controlling factors,and the mechanism of chlorite coatings inhibiting quartz overgrowths were studied in detail with thin section and SEM *** were from the sandstone reservoirs of the T3x Group in the Baojie area,the transitional zone from the middle to the south of Sichuan *** results indicate that the chlorite coatings on the walls of the pore spaces are oriented perpendicular to grain surfaces in the form of isopachous(even-thickness) grain-coating,while the chlorite coatings at the contacts between adjacent detrital grains are arranged with a preferred orientation tangential to the surface of detrital *** chlorite coatings were formed in the eogenetic *** were formed by recrystallization of Fe-rich clay films during the syndepositional period,and chlorite cements would be recrystallized after the coatings’ *** formation of chlorite coatings was mainly controlled by the depositional environment,provenance conditions,and diagenetic *** presence of chlorite coatings could result in the preservation of primary pores in deeply buried sandstone reservoirs by effectively inhibiting quartz overgrowths and the development of compaction and pressure solution.

关键词： Chlorite coatings occurrence time of formation origin controlling factor quartz overgrowths T3x Group

Identification of the Quaternary low gas-saturation reservoirs in the Sanhu area of the Qaidam basin,china

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petroleum Science 2011年第1期8卷 49-54页

作者： Li Xiongyan Li Hongqi Zhou Jinyu He Xu Chen Yihan Yu Hongyan State Key Laboratory of petroleum Resource and Prospecting China University of PetroleumBeijing 102249China Key Laboratory of Earth Prospecting and Information Technology China University of PetroleumBeijing 102249China Department of Computer Science and Technology China University of PetroleumBeijing 102249China Exploration and Development Institute Changqing Petroleum CompanyShaanxi 710021China

Low gas-saturation reservoirs are gas bearing intervals whose gas saturation is less than 47%. They are common in the Quaternary of the Sanhu area in the Qaidam *** to the complex genesis mechanisms and special geological characteristics,the logging curves of low gas-saturation reservoirs are characterized by ambiguity and diversity,namely without significant log response characteristics. Therefore,it is particularly difficult to identify the low gas-saturation reservoirs in the study *** addition,the traditional methods such as using the relations among lithology,electrical property,physical property and gas bearing property,as well as their threshold values,can not effectively identify low gas-saturation *** solve this problem,we adopt the decision tree,support vector machine and rough set methods to establish a predictive model of low gas-saturation reservoirs,which is capable of classifying a mass of multi-dimensional and fuzzy *** to the transparency of learning processes and the understandability of learning results,the predictive model was also revised by absorbing the actual reservoir *** applications indicate that the predictive model is effective in identifying low gas-saturation reservoirs in the study area.

关键词： Sanhu area Qaidam basin low gas-saturation reservoir decision tree support vector machine rough set predictive model identification

Numerical simulation of non-Archie electrophysical property of saturated rock with lattice Boltzmann method

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petroleum Science 2009年第1期6卷 24-28页

作者： Yue Wenzheng Tao Guo Liu Dongming Yang Wendu State Key Laboratory of petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China Key Laboratory of Earth Prospecting and Information Technology China University of Petroleum Beijing 102249 China research Centre of Well Logging CNPC Key Laboratory of Well Logging China University of Petroleum Beijing 102249 China CNPC Logging Changqing Business Division Xi＇an Shaanxi 710201 China Sichuan petroleum Administration Logging Company Ltd. CNPC Chongqing 401147 China

The electrophysical property of saturated rocks is very important for reservoir identification and evaluation. In this paper, the lattice Boltzmann method （LBM） was used to study the electrophysical property of rock saturated with fluid because of its advantages over conventional numerical approaches in handling complex pore geometry and boundary conditions. The digital core model was constructed through the accumulation of matrix grains based on their radius distribution obtained by the measurements of core samples. The flow of electrical current through the core model saturated with oil and water was simulated on the mesoscopic scale to reveal the non-Archie relationship between resistivity index and water saturation （I-Sw）. The results from LBM simulation and laboratory measurements demonstrated that the I-Sw relation in the range of low water saturation was generally not a straight line in the log-log coordinates as described by the Archie equation. We thus developed a new equation based on numerical simulation and physical experiments. This new equation was used to fit the data from laboratory core measurements and previously published data. Determination of fluid saturation and reservoir evaluation could be significantly improved by using the new equation.

关键词： Non-Archie relation digital core model lattice Boltzmann method numerical simulation rock physical experiment

The distribution rule and seepage effect of the fractures in the ultra-low permeability sandstone reservoir in east Gansu Province,Ordos basin

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Science china Earth Sciences 2008年第S2期51卷 44-52页

作者： ZENG LianBo1,GAO ChunYu2,QI JiaFu1,WANG YongKang2,LI Liang2 & QU XueFeng2 1 State Key Laboratory of petroleum Resource and Prospecting,china university of petroleum,beijing 102.49,china 2 Changqing Oilfield Branch,Petrochina,Xi’an 163517,china china Univ Petr State Key Lab Petr Resource & Prospecting Beijing 102249 Peoples R China Petrochina Changqing Oilfield Branch Xian 163517 Peoples R China

To study the impact of the fractures on development in the ultra-low permeability sandstone reservoir of the Yangchang Formation of the Upper Triassic in the Ordos basin,data on outcrops,cores,slices,well logging and experiments are utilized to analyze the cause of the formation of the fractures,their distribution rules and the control factors and discuss the seepage flow effect of the fractures. In the studied area developed chiefly high-angle tectonic fractures and horizontal bedding fractures,inter-granular fractures and grain boundary fractures as well. Grain boundary fractures and intragranular fractures serve as vital channels linking intragranular pores and intergranular solution pores in the reservoir matrix,thus providing a good connectivity between the pores in the ultra-low perme-ability sandstone reservoir. The formation of fractures and their distribution are influenced by such external and internal factors as the palaeo-tectonic stress field,the reservoir lithological character,the thickness of the rock layer and the anisotropy of a layer. The present-day stress field influences the preservative state of fractures and their seepage flow effect. Under the tec-tonic effect of both the Yanshan and Himalayan periods,in this region four sets of fractures are distributed,respectively assuming the NE-SW,NW-SE,nearly E-W and nearly S-N orientations,but,due to the effect of the rock anisotropy of the rock formation,in some part of it two groups of nearly orthogonal fractures are chiefly distributed. Under the effect of the present-day stress field,the fractures that assume the NE-SW direction have a good connectivity,big apertures,a high permeability and a minimum starting pressure,all of which are main advantages of the seepage fractures in this region. With the development of oilfields,the permeability of the fractures of dif-ferent directions will have a dynamic change.

关键词： fracture genetic type distribution characteristic seepage flow effect ultra-low permeability sandstone reservoir Ordos basin

Potential recoverable natural gas resources in china

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petroleum Science 2008年第1期5卷 83-86页

作者： Liu Chenglin Zhu Jie Che Changbo Liu Guangd School of Resource and Information China University of Petroleum Beijing 102249 China Oil and Gas Resource Strategy research center of the Ministry of Land and resource Beijing China

Natural gas resources in china are abundant. The undiscovered recoverable natural gas resources in china are estimated to be 19.27 ×10^12 m^3. Natural gas is mainly distributed in the middle and west china and offshore areas of china. The Tarim basin, Sichuan basin, Ordos basin, East china Sea basin, Tsaidam basin, Yinggehai basin, and Qiongdongnan basin are the main gas-bearing basins. The natural gas resources are not distributed evenly and are under-explored in china. The deeper horizons in east china, foreland basins and craton paleo-uplifts in the middle and west china, and the offshore basins are the main exploration areas in the future.

关键词： Natural gas resources exploration area china

Application of C5-C13 light hydrocarbons in depositional environment diagnosis

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Progress in Natural Science:Materials International 2008年第9期18卷 1129-1137页

作者： Peirong Wanga,b,, Guanjun Xu a,c, Tingrong Xiaoc, Dajiang Zhanga,c, Bin Zhanga,c a Key Laboratory of petroleum Geochemistry, china National petroleum Corporation, beijing 100083, china b Department of Organic Geochemistry, Yangtze university, Jingzhou 434023, china c Central Laboratory of petroleum Geology, research Institute of petroleum Exploration and Development, Petrochina, beijing 100083, china Key Laboratory of petroleum Geochemistry China National Petroleum Corporation Beijing 100083 China Department of Organic Geochemistry Yangtze University Jingzhou 434023 China Central Laboratory of petroleum Geology Research Institute of Petroleum Exploration and Development PetroChina Beijing 100083 China

Based on the geological background and Gammacerane/C31H(S + R) ratios, source rock depositional environments of the studied oil samples (194) from 13 oilfields were classified into three groups according to salinity:saline-lacustrine facies, fresh to brackish lacustrine facies (including limnetic facies), and semi-saline to saline facies (including marine facies of the Tarim basin).C5-C13 compound groups in the crude oils were separated by GC, and about 286 compounds were qualitatively *** geochemical application of the C6-C13 compound groups and their ratios between each group with individual carbon number was *** studies show that (1) C6-C13 compound groups and their ratios in the crude oils could serve as new reliable parameters for oil-oil correlation because the C6-C13 light fractions are the major oil component, especially in light oil or condensate, in which they account for almost 90% of the whole oil;(2) the compound groups of C7 light hydrocarbons in oils derived from difierent depositional environments with difierent salinity have difierent characteristics;(3) C6-C13 compound groups and ratios may be afiected by other factors such as maturity, but they are mainly controlled by salinity of depositional waters.

关键词： Light hydrocarbons Crude oil Depositional environment Salinity

The components and carbon isotope of the gases in inclusions in reservoir layers of Upper Paleozoic gas pools in the Ordos basin,china

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Science china Earth Sciences 2008年第S1期51卷 115-121页

作者： MI JingKui 1 ,DAI JinXing 1 ,ZHANG ShuiChang 1 ,ZHANG WenZheng 2 ,GONG Se 1 &LI XianQing 3 1 research Institute of petroleum Exploration and Development,Petrochina,beijing 100083,china 2 Exploration and Development research Institute of Petrochina Changqing Oilfield Company,Xi’an 710021,china 3 Key Laboratory of Coal Resources,Ministry of Education,china university of Miningand Technology,beijing 100083,china Petrochina Res Inst Petr Explorat & Dev Beijing 100083 Peoples R China Petrochina Changqing Oilfield Co Explorat & Dev Res Inst Xian 710021 Peoples R China china Univ Min & Technol Key Lab Coal Resources Minist Educ Beijing 100083 Peoples R China

The components and carbon isotope of gases in inclusions are one of the most important geochemical indexes for gas *** analysis results of the components and carbon isotope of gases from inclusions in reservoir layers of Upper Palaeozoic gas pools in the Ordos basin show that most inclusions grown in reservoir sandstone are primary *** is only a little difference about the components and carbon isotope between the well gases and the secondary inclusions *** indicated that the epigenetic change of gas pools is *** difference between the well gases and the secondary inclusions gases is caused by two reasons:(i)The well gases come from several disconnected sand bodies buried in a segment of depth,while the inclusion gases come from a point of depth.(ii)The secondary inclusions trapped the gases generated in the former stage of source rock gas generation,and the well gases are the mixed gases generated in all the *** is irresponsible to reconstruct the palaeo-temperature and palaeo-pressure under which the gas pool formed using carbon dioxide inclusions.

关键词： Ordos basin Upper Paleozoic inclusion gas components carbon isotope