Sandbody architecture types and diagenesis differences of quartz sandstone of the Member 23 of Permian Shanxi Formation,eastern Ordos Basin
Li Mi1, 2, Yao Jing-Li3, Guo Ying-Hai1, 2, Li Zhuang-Fu1, 2, Wang Huai-Chang3, Song Xue-Juan1, 2
1 Key Laboratory of CBM Resource and Reservoir-Generating Process,Xuzhou 221008,Jiangsu; 2 School of Resources and Earth Science,China University of Mining & Technology,Xuzhou 221116,Jiangsu; 3 Research Institute of Petroleum Exploration and Development,Changqing Oilfield Company,PetroChina,Xi’an 710021,Shaanxi;
Abstract：There exists a certain correlation between sandbody architectures and single well production of quartz sandstone of the Member 23 of Permian Shanxi Formation in the Zizhou-Qingjian area in the Ordos Basin. Based on the vertical grain-size cycles of the individual sandbody and natural gamma logging data,the sandbody architectures of the study area has been divided into block,normal grading and superimposed types. The paper shows the differences of diagenesis in types,characteristics,intensity,products,vertical variation and pore evolution of the three type sandbodies by casting thin sections observation and particle size analysis. The study shows the intensity and distribution characteristics of the dissolution and compaction of the three type sandbodies are quite different. The vertical distribution of particle size is the direct factor that restricts the diagenetic evolution of the different types of sandbodies,which in turn affect physical property of sandstone reservoirs and finally determine the vertical distribution of gas-bearing layer and tight layer. The reservoir of the block type sandbodies has both primary pores and induced pores of which the gas-bearing layer is thick and tight layer is locally developed. The middle and lower part of reservoirs of normal grading type sandbodies are characterized by poor dissolution degree, which have more primary and less induced pores and are gas-bearing layer. The upper part of reservoir is tight due to strong compaction and cementation. The superimposed type sandbodies formed in the sedimentary environment of gradually strengthened fluvial influence have characteristcs of the both two former types, with the gas-bearing layers are thick and multizone.
Li Mi,Yao Jing-Li,Guo Ying-Hai et al. Sandbody architecture types and diagenesis differences of quartz sandstone of the Member 23 of Permian Shanxi Formation,eastern Ordos Basin[J]. JOPC, 2018, 20(3): 465-476.
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