| Controlling Factors of Organic Nanopore Development: A Case Study on Marine Shale in the Middle and Upper Yangtze Region, South China |
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| 作者姓名： | LIANG Feng ZHANG Qin CUI Huiying MENG Qingqiang MA Chao LIANG Pingping GUO Wei |
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| 作者单位： | 1 PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
2 National Energy Shale Gas R&D Experimental Centre, Langfang 065007, Hebei, China,1 PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
2 National Energy Shale Gas R&D Experimental Centre, Langfang 065007, Hebei, China；3 School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China,1 PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China,4 Seidment-Tectonic and Reservoir Laboratory, PEPRIS, Beijing 100083, China
5 Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Mineral, Shandong University of Science and Technology, Qingdao 266590, Shandong, China,1 PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
2 National Energy Shale Gas R&D Experimental Centre, Langfang 065007, Hebei, China,1 PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
2 National Energy Shale Gas R&D Experimental Centre, Langfang 065007, Hebei, China and 1 PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
2 National Energy Shale Gas R&D Experimental Centre, Langfang 065007, Hebei, China |
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| 基金项目： | This study was supported by the National Science and Technology Major Project |
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| 摘 要： | The Upper Ordovician Wufeng-Lower Silurian Longmaxi and the Lower Cambrian Qiongzhusi shales are the major targets for shale gas exploration and development in China. Although the two organic-rich shales share similar distribution ranges and thicknesses, they exhibit substantially different exploration and development results. This work analyzed the nanopore structures of the shale reservoirs in this region. Pore development of 51 shale samples collected from various formations and locations was compared using the petromineralogical, geochemical, structural geological and reservoir geological methods. The results indicate that the reservoir space in these shales is dominated by organic pores and the total pore volume of micropores, mesopores, macropores in different tectonic areas and formations show different trends with the increase of TOC. It is suggested that organic pores of shale can be well preserved in areas with simple structure and suitable preservation conditions, and the shale with smaller maximum ancient burial depth and later hydrocarbon-generation-end-time is also more conducive to pore preservation. Organic pore evolution models are established, and they are as follows: ① Organic matter pore development stage, ② Early stage of organic matter pore destruction, and ③ late stage of organic matter pore destruction. The areas conducive to pore development are favorable for shale gas development. Research results can effectively guide the optimization and evaluation of favorable areas of shale gas.
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| 收稿时间： | 2018/8/1 0:00:00 |
| 修稿时间： | 2018/12/20 0:00:00 |
Controlling Factors of Organic Nanopore Development: A Case Study on Marine Shale in the Middle and Upper Yangtze Region,South China |
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| Authors: | LIANG Feng ZHANG Qin CUI Huiying MENG Qingqiang MA Chao LIANG Pingping and GUO Wei |
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| Abstract: | The Upper Ordovician Wufeng‐Lower Silurian Longmaxi and the Lower Cambrian Qiongzhusi shales are the major targets for shale gas exploration and development in China. Although the two organic‐rich shales share similar distribution ranges and thicknesses, they exhibit substantially different exploration and development results. This work analyzed the nanopore structures of the shale reservoirs in this region. Pore development of 51 shale samples collected from various formations and locations was compared using the petromineralogical, geochemical, structural geological and reservoir geological methods. The results indicate that the reservoir space in these shales is dominated by organic pores and the total pore volume of micropores, mesopores, macropores in different tectonic areas and formations show different trends with the increase of TOC. It is suggested that organic pores of shale can be well preserved in areas with simple structure and suitable preservation conditions, and the shale with smaller maximum ancient burial depth and later hydrocarbon‐generation‐end‐time is also more conducive to pore preservation. Organic pore evolution models are established, and they are as follows: ① Organic matter pore development stage, ② Early stage of organic matter pore destruction, and ? late stage of organic matter pore destruction. The areas conducive to pore development are favorable for shale gas development. Research results can effectively guide the optimization and evaluation of favorable areas of shale gas. |
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| Keywords: | marine shale organic matter pores controlling factors pore evolution middle-upper Yangtze regions South China |
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