庆阳气田山1段差异性成岩作用及其对储集层的影响

doi:10.7657/XJPG20250306

摘要/Abstract

摘要：

庆阳气田二叠系山1段埋藏深度大，成岩作用复杂，成岩-孔隙演化差异大，对有利储集层认识不清晰。利用铸体薄片、扫描电镜、高压压汞、阴极发光、自生黏土矿物X射线衍射等资料，结合前人研究成果，对庆阳气田山1段成岩作用进行研究。结果表明：庆阳气田山1段从西南至东北依次发育曲流河三角洲平原亚相及前缘亚相，前缘亚相储集层较平原亚相储集层而言，填隙物含量低，孔隙发育，孔喉结构好，物性较高；沉积作用控制了储集层的初始孔隙度，差异性成岩-孔隙演化影响了储集层的致密化程度，前缘亚相储集层初始孔隙度较高，压实-胶结作用降低了36.34%的孔隙度，溶蚀作用升高了4.28%的孔隙度，现今平均孔隙度为7.13%，平原亚相储集层初始孔隙度较低，压实-胶结作用降低了37.72%的孔隙度，溶蚀作用升高了3.65%的孔隙度，现今平均孔隙度为4.43%；前缘亚相储集层经历了中等压实作用降低孔隙度—中等胶结作用降低孔隙度—中等溶蚀作用升高孔隙度的致密化过程，储集层质量较好；平原亚相储集层经历了强压实作用降低孔隙度—中等胶结作用降低孔隙度—弱溶蚀作用升高孔隙度的致密化过程，储集层质量较差。

关键词: 鄂尔多斯盆地, 庆阳气田, 山1段, 储集层质量, 成岩-孔隙演化, 成岩作用

Abstract:

The Permian Shan-1 member in the Qingyang gas field is characterized by large burial depth, complex diagenetic processes, and differential diagenesis-pore evolution, leading to unclear understanding of favorable reservoirs. By using the data from cast thin sections, scanning electron microscopy (SEM), physical properties, cathodoluminescence (CL), and X-ray diffraction (XRD) of authigenic clay minerals, and combining with previous research findings, the diagenesis of the Shan-1 member was investigated. The results indicate that the Shan-1 member exhibits a transition from meandering-river delta plain subfacies to delta front subfacies from southwest to northeast. Compared with delta plain reservoirs, the delta front reservoirs are featured with fewer interstitial materials, developed pores, better pore-throat structure, and favorable physical properties. Sedimentation controls the initial porosity, while differential diagenesis-pore evolution determines the degree of reservoir compaction. The delta front reservoirs are found with high initial porosity, which was then reduced by 36.34% due to compaction and cementation and enhanced by 4.28% due to dissolution, resulting in a present-day average porosity of 7.13%. In contrast, the delta plain reservoirs have low initial porosity, which was then reduced by 37.72% due to compaction and cementation and enhanced by 3.65% due to dissolution, resulting in a present-day average porosity of 4.43%. The delta front reservoirs are of good quality, as a result of a densification process from moderate compaction reducing porosity, to moderate cementation further decreasing porosity, and to moderate dissolution enhancing porosity. In contrast, the delta plain reservoirs show poor quality, after a densification process from strong compaction reducing porosity, to moderate cementation further decreasing porosity, and to weak dissolution enhancing porosity.

Key words: Ordos Basin, Qingyang gas field, Shan-1 member, reservoir quality, diagenesis-pore evolution, diagenesis

中图分类号:

TE122.1

曹江骏, 张道锋, 王继平, 周游, 李笑天, 李娅, 范倩倩, 董倩云. 庆阳气田山1段差异性成岩作用及其对储集层的影响[J]. 新疆石油地质, 2025, 46(3): 296-307.

CAO Jiangjun, ZHANG Daofeng, WANG Jiping, ZHOU You, LI Xiaotian, LI Ya, FAN Qianqian, DONG Qianyun. Differential Diagenesis of Shan-1 Member and Its Impact on Reservoirs in Qingyang Gas Field[J]. Xinjiang Petroleum Geology, 2025, 46(3): 296-307.

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