How argillaceous reservoirs exhibit better quality than silty mudstones?Anomalous behavior of shale gas-bearing properties of continental fine-grained sediments in Southwest China and its possible forcing mechanisms

作     者：Wei Yang Liang Xu Dong-Xia Chen Zhen-Xue Jiang Zi-Ya Zhang Bin Hao Ru-Si Zuo Qian-You Wang Rong Chen Wei Yang;Liang Xu;Dong-Xia Chen;Zhen-Xue Jiang;Zi-Ya Zhang;Bin Hao;Ru-Si Zuo;Qian-You Wang;Rong Chen

作者机构：State Key Laboratory of Petroleum Resources and ProspectingChina University of Petroleum(Beijing)Beijing102249China The Unconventional Oil and Gas InstituteChina University of Petroleum(Beijing)Beijing102249China College of GeosciencesChina University of PetroleumBeijing102249China Oil&Gas SurveyChina Geological SurveyBeijing100029China The Key Laboratory of Unconventional Petroleum GeologyChina Geological SurveyBeijing100029China Northwest BranchPetroChina Research Institute of Petroleum Exploration and DevelopmentLanzhouGansu 730020China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2021年第18卷第6期

页      面：1589-1610页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the Science Foundation for Distinguished Young Scholars of China University of Petroleum,Beijing(No.2462020QNXZ004) the National Natural Science and Technology Major Project(No.2016ZX05034-001 and 2017ZX05035-002) 

主　　题：Granularity Silty-mud sediments Reservoir quality Bitumen pores Clay mineral Differential reservoir-forming 

摘      要：Achieving a thorough understanding of how primary sedimentary granularity drives considerable heterogeneity in internal reservoir attributes of terrigenous fine-grained deposits is of great *** investigated the quantitative differentiation and its corresponding driving forces of physical reservoir properties and pore-structure characteristics of silty-mud sediments in the Upper Triassic Xujiahe Formation(SW China)using a multi-method *** results show that the micro-mesopore volume and surface area of mudstones/shales are apparently higher than those of silty mudstones and a remarkable threefold rise in average permeability also *** distributed bitumen pores occurring mostly along brittle mineral grains or forming clay-organic complexes make considerable contributions to shrinking ***,an evidently higher concentration of clay minerals in mudstone/shale reservoirs is primarily responsible for development of the two types of clay intercrystalline pores distributed along grain aggregates and between well-oriented *** two major causes facilitate the formation of micro-bedding fractures/non-bedding micro fractures and connected fracture and pore-fracture networks,and also high-quality argillaceous reservoirs by strongly enhancing storage spaces and seepage ***,a conceptual model is established for interpreting a differential reservoir-forming mechanism and corresponding two-sided effects on petrophysical and reservoir quality properties for continental silty-mud sediments.