下扬子地区官地1井下寒武统海相泥页岩孔隙发育特征及影响因素  

Pore characteristics and influencing factors of the Lower Cambrian marine shale in the Lower Yangtze area

作　　者：鲍衍君 张鹏辉 陈建文 梁杰[4,5] 孟祥豪 付奕霖[1] 薛路[1] 张旭 王拔秀 BAO Yanjun;ZHANG Penghui;CHEN Jianwen;LIANG Jie;MENG Xianghao;FU Yilin;XUE Lu;ZHANG Xu;WANG Baxiu(College of Oceanography,Hohai University,Nanjing 210024,China;Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266237,China;School of Resources and Environmental Engineering,HeFei University of Technology,Hefei 230009,China;Laboratory for Marine Mineral Resources,Pilot National Laboratory for Marine Science and Technology,Qingdao 266237,China;Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266237,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Chengdu University of Technology),Chengdu 610059,China)

机构地区：[1]河海大学海洋学院,南京210024 [2]中国科学院海洋地质与环境重点实验室,中国科学院海洋研究所,青岛266237 [3]合肥工业大学资源与环境工程学院,合肥230009 [4]青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室,青岛266237 [5]中国地质调查局青岛海洋地质研究所,青岛266237 [6]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059

出　　处：《海洋地质与第四纪地质》2022年第2期144-157,共14页Marine Geology & Quaternary Geology

基　　金：江苏省研究生科研与实践创新计划项目“下扬子地区下寒武统海相页岩孔隙结构特征及影响因素”(KYCX_0522);中国科学院海洋地质与环境重点实验室开放基金课题“南黄海盆地崂山隆起下志留统泥页岩成岩演化及其对孔隙发育的影响”(MGE2021KG16);中央高校基本科研业务费项目“下扬子地区下寒武统海相页岩孔隙结构特征及影响因素”(B200203135),“下扬子地块早寒武世古海洋环境演化”(B200202144);中国地质调查局项目“崂山隆起构造沉积条件地质调查”(DD20190818),“南黄海油气资源调查”(DD20160152);国家自然科学基金项目“下扬子地区下寒武统深水陆棚相富有机质泥页岩差异性成岩演化过程及其对孔隙发育的控制作用”(41702162),“南黄海崂山隆起二叠系储层油气成藏破坏与流体演化过程还原研究”(42076220);山东省自然科学基金项目“南黄海盆地崂山隆起石炭系油气保存条件的主控因素分析”(ZR2020MD071)。

摘　　要：以下扬子陆域地区官地1井下寒武统幕府山组海相泥页岩岩心样品为研究对象,综合运用场发射扫描电镜、X衍射分析、气体吸附、高压压汞和有机地球化学分析等实验测试手段,系统研究了官地1井幕府山组泥页岩孔隙结构特征和孔隙发育影响因素。研究表明:(1)官地1井幕府山组泥页岩矿物组成以石英、方解石胶结物和黏土矿物为主,其总有机碳含量较高,有机质类型以I型干酪根为主且均处于过成熟阶段;(2)泥页岩孔隙类型主要为基质孔隙(粒间孔隙和粒内孔隙)、有机质孔隙和微裂隙,其中以有机质孔隙含量居多,而粒间孔隙面孔率占比最高;(3)有机质丰度对有机质孔隙的孔径和比表面积具有一定的影响,压实作用则构成过成熟阶段孔隙演化的主要因素,而刚性矿物具有一定的支撑作用并对有机质孔隙的保存具有积极意义;(4)分形维数与总有机碳含量和比表面积相关性较好,而与孔隙体积相关性弱,反映孔壁粗糙程度及孔隙结构复杂程度受有机质丰度影响。The marine shale samples of the Lower Cambrian Mufushan Formation collected from the Well GD1 in the Lower Yangtze area are systematically studied in this paper for pore structure characteristics and their influencing factors.Various testing methods,such as field emission scanning electron microscope,X-ray diffraction analysis,gas adsorption,high-pressure mercury injection and organic geochemical analysis are adopted for this research.It is revealed that the Mufushan shale is mainly composed of quartz,calcite and clay minerals in mineralogy.The total organic carbon content is quite high,and the organic matter is dominated by the type I of kerogen overmatured.The pores are dominated by matrix pores including intergranular and intragranular pores,organic matter pores and microfractures.Organic matter pores are well developed,and the proportion of intergranular pores is the highest.Organic matter abundance has certain influence on the pore size and specific surface area of organic matter pores.Compaction is the main factor for pore evolution in the overmatured stage,while rigid minerals,as supporting components,play a positive role in the preservation of organic matter pores.The fractal dimension has a good correlation with the total organic carbon content and specific surface area but weak correlation with pore volume,suggesting that the roughness of the pore wall and the complexity of the pore structure are affected by organic matter abundance.

关 键 词：孔隙特征 泥页岩 官地1井 下寒武统 下扬子地区 

分 类 号：P536[天文地球—古生物学与地层学]