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- Title
四川盆地中部合川—潼南地区茅一段泥灰岩 储层特征与评价.
- Authors
李强; 师江波; 周聪; 鞠林波; 谭万仓; 崔洁珺; 张慧君; 王年梅; 王力娟; 张凯; 宋振宇; 肖传桃
- Abstract
The first member of Maokou Formation (Mao 1 Member) of Middle Permian in Sichuan Basin is characterized by the rapid alternate development of “eye limestone” and “eyelid limestone”, which is widely distributed in the basin. In recent years, using the idea of unconventional natural gas exploration for reference, great breakthroughs have been made in the Mao 1 Member in various regions of Sichuan Basin. Drilling and production results show that the muddy limestone (eyelid limestone) reservoir has good gas content and great exploration potential. However, since it has long been considered as a set of good source rocks, the testing and evaluation of the Mao 1 Member reservoir lacks pertinence. In this study, based on the latest drilling data of two wells in Hechuan-Tongnan area of central Sichuan Basin and the outcrop observation of the surrounding field, the characteristics of the muddy limestone reservoir in the Mao 1 Member are analyzed in detail. The results show that the reservoir space of the muddy limestone reservoir in the Mao 1 Member is mainly clay mineral pores, dissolution pores and organic matter pore, followed by micro-fractures. Pores are dominated by medium pore, mainly in the form of slit pores, followed by micropores and macropores. Pores are dispersed and developed, and the connectivity between pores is medium.The total organic carbon content is relatively high, the organic maturity is high, and the hydrocarbon generation condition is good. It is an unconventional carbonate reservoir with self-generation and self-storage characteristics.On this basis, the author establishes the evaluation criteria of marl reservoir, and makes a preliminary evaluation of muddy limestone reservoir. It is considered that the muddy limestone of the Mao 1 Member generally meets the basic conditions of reservoir accumulation, and partially meets the favorable reservoir formation conditions, which has further exploration and development value.
- Subjects
SICHUAN Sheng (China); NATURAL gas prospecting; CARBONATE reservoirs; CLAY minerals; ORGANIC compounds; MARL; LIMESTONE; GAS condensate reservoirs; COALBED methane
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 12, p1986
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.07.008