The Influence of Extractable Organic Matter on Pore Development in the Late Triassic Chang 7 Lacustrine Shales, Yanchang Formation, Ordos Basin, China |
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| Authors: | HAN Hui LIU Pengwei DING Zhengang SHI Pitong JIA Jianchao ZHANG Wei LIU Yan CHEN Shiji LU Jungang Chen Kang PENG Xudong WANG Zhiyong XIAO Shuqi and GAO Yuan |
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| Institution: | 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University;2. Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, Shandong University of Science and Technology;3. State Key Laboratory of Petroleum Resources & Prospecting, China University of Petroleum;4. Research Institute of Shaanxi Yanchang Petroleum (Group) Co., Ltd.;5. Development Business Unit of Huabei Oilfield Company PetroChina, Renqiu;6. Research Institute of Petroleum Exploration and Development of Huabei Oilfield Company PetroChina, Renqiu;7. Institute of Mud Logging Technology and Engineering, Yangtze University, Jingzhou;8. Beijing Center for Physical and Chemical Analysis |
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| Abstract: | To investigate the influence of extractable organic matter (EOM) on pore evolution of lacustrine shales, Soxhlet extraction, using dichloromethane, was performed on a series of Chang 7 shale samples (Ordos Basin, China) with vitrinite reflectance of 0.64% to 1.34%. Low‐pressure gas adsorption experiments were conducted on the samples before and after extraction. The pore structure parameters were calculated from the gas adsorption data. The results show complex changes to the pore volumes and surface areas after extraction. The pore development of both the initial and extracted samples is strongly controlled by total organic carbon (TOC) content. Micropores developed mainly in organic matter (OM), while mesopores and macropores predominantly developed in fractions other than OM. The influence of EOM on micropores is stronger than on mesopores and macropores. Organic solvents with a higher boiling point should be used to explore the effect of EOM on pore structure in the future. |
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| Keywords: | lacustrine shale pore development extraction shale gas Chang 7 Ordos Basin |
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