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- Title
四川盆地蓬莱气区灯二段储集层特征及主控因素.
- Authors
张本健; 马华灵; 李文正; 张 亚; 张自力; 严 威; 曾乙洋; 王 鑫; 钟 原; 李堃宇; 谷明峰; 杨岱林; 徐哲航
- Abstract
The enormous exploration potential within the second member of the Dengying Formation in the northern slope area of the paleo-uplift at the central Sichuan Basin was revealed by the exploratory break-throughs in the Penglai area, Sichuan Basin. Methods in this study include core and thin section observations, petrophysical tests, carbon and oxygen analyses, and carbonate U-Pb dating. It aims to illustrate the mechanism of formation for high-quality microbial dolomite reservoir in the second member of the Dengying Formation in the Penglai Gas Field. The dominant rock type in the second member of the Dengying Formation in the Penglai Gas Field was microbial dolomite. Vertically, the intermound microfacies dominated by dolo-mudstone was at the base. The mound core microfacies dominated by dolo-thrombolite and dolo-spongiomicrobialite was at the central part. The mound flat microfacies dominated by laminated dolo-stromatolite and intraclastic dolograin-stone was at the top. Amongst these, the porosity, permeability, and pore structure of mound core build-ups were the best. The quality of reservoirs for the mound flat build-ups were the second-best. In contrast, dolomudstone of the intermound microfacies had the poorest reservoir ability. The distribution of microfacies in mi-crobial mounds was the basis for controlling the development of high-quality dolomite reservoirs in the second member of the Dengying Formation in the Penglai Gas Field. The activity of syn-sedimentary faults allowed the widespread development of superior reservoirs of syngenetic brecciated dolostone. The combination of penecon-temporaneous and telogenetic dissolution eventually controlled the formation of microbial reservoirs in the sec-ond member of the Dengying Formation.
- Subjects
SICHUAN Sheng (China); DOLOMITE
- Publication
Natural Gas Geoscience, 2023, Vol 34, Issue 11, p1899
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2023.09.002