北京大学学报（自然科学版）2026，Vol.62Issue(3)：561-570,10.DOI:10.13209/j.0479-8023.2025.032
基于沉积区域分类的鄂尔多斯盆地延长组长7段页岩孔隙发育影响因素研究
Study on Influencing Factors of Shale Pore Development in the Chang-7 Menmer of Yanchang Formation,Ordos Basin,Based on Sedimentary Facies Classification
摘要
Abstract
The Chang-7 Member of the Yanchang Formation in the south-central Ordos Basin was selected as the research object.Based on the measured data from 41 wells,the Kriging interpolation and Partial Least Squares Regression(PLSR)were adopted to systematically analyze the main controlling factors of pore development under different geological conditions.The results show that when the Total Organic Carbon(TOC)content is less than 6%,the samples are mainly distributed at the lake basin margin,and the total content of the main brittle minerals(quartz and feldspar)exhibits a significant negative correlation with TOC.When the TOC content exceeds 6%,the samples are mainly distributed in the central lake basin,and there is no obvious correlation between the total quartz and feldspar content and TOC.There are remarkable differences in the main controlling factors of pore development in different regions of the lake basin around the TOC critical point(6%).Pore development in the central lake basin is mainly controlled by TOC and pyrite content,where the negative impact of TOC on pore development is manifested as pore filling by solid bitumen.In contrast,pore development at the lake basin margin is mainly dominated by the content of carbonate minerals and chlorite:the cementation of carbonate minerals damages reservoir pores,while chlorite protects reservoir pores by weakening cementation and enhancing the compaction resistance of rocks.关键词
延长组/长7段/页岩孔隙/沉积区域Key words
Yanchang Formation/Chang-7 member/shale pore/sedimentary region引用本文复制引用
张昌虎,董琳,王梓毅..基于沉积区域分类的鄂尔多斯盆地延长组长7段页岩孔隙发育影响因素研究[J].北京大学学报（自然科学版）,2026,62(3):561-570,10.基金项目
国家自然科学基金(42090021,42373050)资助 （42090021,42373050）
