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Wang X.-P.,Shandong University of Science and Technology | Wang X.-P.,Key Laboratory Sedimentary Basins Oil and Gas Resources | Mou C.-L.,Key Laboratory Sedimentary Basins Oil and Gas Resources | Mou C.-L.,Chengdu Institute of Geology and Mineral Resources | And 12 more authors.
Natural Gas Geoscience | Year: 2014

In order to investigate the physical characteristics of clay minerals in shale gas reservoir and their influence on the gas exploration and development, black shale from the Lower Silurian Longmaxi Formation in southern Sichuan Basin and its periphery were as studied. Based on X-diffraction analysis, combined with observation of thin sections and backscattered electron images, characteristics of clay minerals and their distribution were revealed. Chlorite+illite/smectite+illite is the main assemblage, including transformed and inherited types, which is dominated by illite, illite/smectite mixed layers and chlorite. The type and content of clay minerals have a certain meaning for sedimentary facies, for example, deep shelf facies have an average content of >50%, transitional facies are of <30%, and shallow shelf facies is between them. Longmaxi Formation had experienced arid-semiarid climate during sedimentation, burial water medium was saline and alkaline, and enriched in K+. The diagenetic evolution has reached the late diagenetic stage. In combination with the distribution characteristics of TOC, the area of Qijiang-Wulong-Pengshui in southeast of Chongqing, and Leibo-Junlian-Xingwen-Renhuai-Tongzi in west of Guizhou and north of Yunnan, as well as Xihe county in western Sichuan, are favorable for shale gas. The area of Yibin-Jiangjin-Fuling in Sichuan, is a secondary favorable zone. ©, 2014, Science Press. All right reserved.


Wang X.-P.,Shandong University of Science and Technology | Wang X.-P.,Key Laboratory Sedimentary Basins Oil and Gas Resources | Mou C.-L.,Key Laboratory Sedimentary Basins Oil and Gas Resources | Mou C.-L.,Chengdu Institute of Geology and Mineral Resources
Natural Gas Geoscience | Year: 2013

According to the results of experimental methods such as polarizing microscope, scan electron microscope and cathode luminescent, and previous published research results, the characteristics of diagenesis and diagenetic facies of reservoir in He8 section of Shihezi Formation in east II part of Sulige Gas Field were studied. Meanwhile, the test results of fluid inclusions were also considered. The diagenetic evolution was divided into four stages including six phases. In the process of diagenetic evolution, the dissolution in late period B of early diagenetic stage to early period B of middle diagenetic stage is so important that produces lots of secondary pores, and because of the dissolution, this stage is the key time to form constructive diagenetic facies. According to the study of petrology and diagenesis, there were five diagenetic facies types, and the logging characteristics of each diagenetic facies were set up. After analyzing the diagenetic facies of single well, diagenetic facies in vertical are characterized by dissolution facies in the below and compaction facies in the upper, and the plane distribution is confined by sedimentary facies. The dissolution facies of unstable components of sandstone with low pore and permeability are the most constructive facies which distribute isolatedly.

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