Controls on reservoir quality in the paleogene Kalatar Formation of the southwestern region of the Tarim Basin,China

作     者：Yang Haijun Shen Jian-Wei Wang Xu Zhang Lijuan Li Meng Yang Haijun 2,Shen Jian-Wei 1,Wang Xu 1,3,Zhang Lijuan 2,Li Meng 2 1 Key Laboratory of Marginal Sea Geology of CAS,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China 2 Exploration and Development Research Institute,Tarim Oilfield Company,Petroleum Company Limited,Korla 841000,China 3 Graduate School of the Chinese Academy of Sciences,Beijing 100049,China

作者机构：Key Laboratory of Marginal Sea Geology of CAS South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Exploration and Development Research Institute Tarim Oilfield Company Petroleum Company Limited Korla 841000 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2011年第8卷第3期

页      面：302-315页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 0808[工学-电气工程] 081803[工学-地质工程] 07[理学] 08[工学] 0820[工学-石油与天然气工程] 0707[理学-海洋科学] 0817[工学-化学工程与技术] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0816[工学-测绘科学与技术] 0827[工学-核科学与技术] 0813[工学-建筑学] 0703[理学-化学] 0814[工学-土木工程] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 082002[工学-油气田开发工程] 

基　　金：supported by the National Natural Sciences Foundation of China(Grant No.40872078) the Knowledge Innovation Program of South China Sea Institute of Oceanology(GrantNo.LYQY200806) the Research Project of Tarim Oilfield Company(Grant No.41009080051) 

主　　题：Kalatar Formation sedimentary facies diagenesis dolomitization fractures climaticconditions Tarirn Basin 

摘      要：The Paleogene Kalatar Formation is a main target for petroleum ex125 ploration in the southwestern region of the Tarim Basin （SWRTB） and a systematical summary of controls on reservoirs of high quality has important implications for this area. According to outcrop analysis, as well as core, and laboratory experiments based on theories of sedimentology, it can be inferred that the main pore types in the Kalatar Formation are moldic, vuggy, intercrystalline and interparticle pores, fractures, and mudstone microporosity, respectively. The foreshore in the shore-shelf depositional model is the most favorable target, wherein grainstone and dolomitized grainstone are characterized by high quality in a middle ramp subfacies of the carbonate ramp model. Diagenetic factors, such as micritization, cementation, compaction, neomorphism, silicification, and pyritization, are detrimental for reservoirs. At the same time, leaching and dolomitization can improve the quality of reservoirs. Permeability of reservoirs can be greatly improved by fractures, through which quality of reservoirs can be effectively enhanced. Concentration of CO2, temperature, and humidity are affected by changes in climate, which can have an influence on depositional setting, composition and diagenesis of sediments, and eventually the properties of reservoirs. The hot and arid climate of the Paleogene was harmful to development of reservoirs, which is demonstrated in the contemporaneous diagenetic and epigenetic stages. Shallow and deep-burial diagenesis are closely related to the formation and the connate water, however these are rarely affected by paleo-climatic variation. There is possible erosion that mainly resulted from organic acid in relative well intervals according to indications of hydrocarbons in the early diagenetic stage. Fracture systems can be established when acidic fluids are ernplaced during periods of uplift, by which pores can be effectively enlarged during the late diagenetic stages.