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nanoscale pore characteristics of the Upper Permian Mudrocks from a Transitional Environment in and around Eastern Sichuan Basin, China

引用

Acta Geologica Sinica(English Edition) 2019年第4期93卷 1025-1046页

作者： CAO Taotao LIU Guangxiang LIU Hu DENG Mo HAN Yuanhong HUANG Yanran Andrew S.HURSTHOUSE Hunan Provincial Key Laboratory of Shale Gas Resource Utilization Hunan University of Science and TechnologyXiangtanHunan 411201China Department of Geology Hunan University of Science and TechnologyXiangtanHunan 411201China Wuxi Research Institute of Petroleum Geology Petroleum Exploration and Production Research InstituteSINOPECWuxiJiangsu 214126China Sichuan Key Laboratory of Shale Gas Evaluation and Exploration Chengdu 600091China Key Laboratory of Coal Resources Exploration and Comprehensive Utilization Ministry of Land and ResourcesXi’an 710021China School of Science and Sport University of the West of ScotlandPaisley P A12BEUK

nanoscale pore characteristics of the Upper Permian Longtan transitional mudrocks and their equivalent strata Wujiaping Formation marine mudrocks in and around the eastern Sichuan Basin was investigated using field emission scanning electron microscopy(FE-SEM)and low-pressure N2 adsorption *** results indicate that the Upper Permian mudrock is at a mature stage with total organic carbon(TOC)values ranging between 0.47%and 12.3%.The Longtan mudrocks mainly contain vitrinite,and their mineral composition is primarily *** contrast,the Wujiaping mudrocks are dominated by sapropelinite and solid bitumen,and their mineral compositions are mainly quartz and a notably high amount of *** FE-SEM reveals that clay mineral pores and microcracks are the common pore types in the Longtan *** specific surface area and pore volume depend on the clay content but are negatively correlated with the *** generation of nanometer pores in the Longtan mudrocks is caused by high clay mineral ***,the Wujiaping mudrock mainly contains OM pores,and the pore parameters are positively correlated with the *** OM pore development exhibits remarkable differences in the Longtan and Wujiaping mudrocks,which might be related to their sedimentary facies and maceral *** and inertinite appear as discrete particles in these mudrocks and cannot generate pores during thermal *** often contains many secondary pores,and solid bitumen with large particles,usually with several pores,is not the major contributor to the pore system of the investigated mudrock.

关键词： nanoscale pore characteristics FE-SEM low-pressure N2 adsorption transitional mudrock Longtan/Wujiaping Formation eastern Sichuan Basin

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