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- Title
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.
- Authors
王艳忠; 宋 磊; 孟 涛; 操应长; 孙沛沛; 王淑萍; 弭连山
- 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 (P2 sh) 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 systematically 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 represents the second phase of quartz overgrowth and fills microfractures in quartz particles or intergranular pores. The kaolinite includes 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 Subsag, 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 cement → blue fluorescence oil → natural gas→ authigenic kaolinite precipitation in granular form, illite and chlorite.
- Subjects
LASER ablation inductively coupled plasma mass spectrometry; CHLORITE minerals; FLUID inclusions; KAOLINITE; FELDSPAR
- Publication
Journal of China University of Petroleum, 2024, Vol 48, Issue 4, p43
- ISSN
1673-5005
- Publication type
Article
- DOI
10.3969/j.issn.1673-5005.2024.04.005