Differential Diagenesis of Shan-1 Member and Its Impact on Reservoirs in Qingyang Gas Field

doi:10.7657/XJPG20250306

Abstract

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

CLC Number:

TE122.1

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.

Figures/Tables 11

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