中国石油大学学报（自然科学版）2024，Vol.48Issue(4)：43-56,14.DOI:10.3969/j.issn.1673-5005.2024.04.005
济阳坳陷车西洼陷二叠系上石盒子组致密砂岩储层成岩-成藏系统演化
Evolution of diagenesis-hydrocarbon accumulation system of tight sandstone reservoirs of Permian Upper Shihezi Formation in Chexi Subsag,Jiyang Sub-basin,China
摘要
Abstract
The evolution of the diagenetic-accumulation system in tight sandstone reservoirs determines the densification process and the genesis and distribution of high-quality reservoirs.This study examines the tight sandstone reservoir of Permian Upper Shihezi Formation(P2sh)in the Chexi Sag,integrating burial history,tectonic evolution history,and multi-proxy analyses such as thin sections,fluid inclusion analysis,and laser ablation inductively coupled plasma mass spectrometry to systematical-ly study the evolution of the diagenesis-accumulation system.Results indicate that siliceous cement is derived from the pressure dissolution of quartz particles,which contributes the first phase of quartz overgrowth and from feldspar dissolution,which repre-sents the second phase of quartz overgrowth and fills microfractures in quartz particles or intergranular pores.The kaolinite in-cludes a fine-grained kaolinite matrix from the sedimentary period,coarse-grained kaolinite from the leaching of atmospheric freshwater through feldspars,and granular kaolinite from feldspar dissolution in a deep-burial closed system.The evolution process of the diagenesis-hydrocarbon accumulation system of the tight sandstone in the Upper Shihezi Formation,Chexi Sub-sag,follows this sequence:original sedimentary feldspar quartz sandstone with fine-grained kaolinite matrix → coarse-grained kaolinite →yellow fluorescence oil → siliceous cement →natural gas → coarse-grained kaolinite precipitation→ siliceous ce-ment → blue fluorescence oil → natural gas→ authigenic kaolinite precipitation in granular form,illite and chlorite.关键词
成岩-成藏系统演化/硅质胶结/高岭石/致密砂岩/上石盒子组/车西洼陷Key words
evolution of diagenesis-hydrocarbon accumulation system/siliceous cement/Kaolinite/tight sandstone/Upper Shihezi/Chexi Subsag分类
能源科技引用本文复制引用
王艳忠,宋磊,孟涛,操应长,孙沛沛,王淑萍,弭连山..济阳坳陷车西洼陷二叠系上石盒子组致密砂岩储层成岩-成藏系统演化[J].中国石油大学学报（自然科学版）,2024,48(4):43-56,14.基金项目
国家自然科学基金项目(42272165) （42272165）
