四川盆地西南部茅口组岩溶储层分布及成藏特征

doi:10.3969/j.issn.1006-6535.2025.04.006

摘要/Abstract

摘要： 针对四川盆地西南部茅口组岩溶储层分布和成藏特征认识不清的问题,利用地质、钻井、测井和三维地震资料,将岩溶储层进行分类,优选地震属性进行分布预测,分析了不同类型岩溶储层的成藏配置关系。研究表明:研究区位于有利的古地貌单元内,发育顶部岩溶、层间岩溶、与断层相伴生岩溶及岩溶塌陷4种类型岩溶储层,地震纹理熵属性对层间断溶体、岩溶塌陷刻画精度较高;研究区为“自生自储、下生上储,断裂、裂缝高效输导”的油气成藏模式,古地貌、不同类型岩溶储层分布、断裂和裂缝等多种因素共同控制着茅口组气藏的分布。研究成果为该区茅口组下一步勘探提供了重要支撑。

关键词: 古地貌, 岩溶储层类型, 熵属性, 成藏特征, 茅口组, 川西南地区

Abstract: To address the unclear understanding of the distribution and hydrocarbon accumulation characteristics of Maokou Formation karst reservoirs in southwestern Sichuan Basin,this study integrated geological, drilling, logging, and 3 D seismic data, classified the karst reservoirs, selected seismic attributes for distribution prediction, and analyzed the hydrocarbon accumulation relationships of different karst reservoir types. The study shows that the study area, located in a favorable paleogeomorphic unit, features four types of karst reservoirs developed: top karst, interbed karst, fault-associated karst, and karst collapse. Seismic texture entropy attributes effectively characterize interbed karst bodies and karst collapse. The hydrocarbon accumulation mode of the study area is "self-sourced and self-stored, sourced in lower part and stored in upper part, with efficient transport via faults and fractures." The distribution of Maokou Formation gas reservoirs is jointly controlled by paleogeomorphology, karst reservoir distribution, and fault and fracture systems. The research findings provide crucial support for further Maokou Formation exploration in the area.

Key words: paleogeomorphology, karst reservoir types, entropy attributes, hydrocarbon accumulation characteristics, Maokou Formation, southwestern Sichuan Basin

中图分类号:

TE122.2

李素华, 贾霍甫, 卢齐军, 李蓉, 苏成鹏, 朱兰. 四川盆地西南部茅口组岩溶储层分布及成藏特征[J]. 特种油气藏, 2025, 32(4): 50-57.

LI Suhua, JIA Huofu, LU Qijun, LI Rong, SU Chengpeng, ZHU Lan. Distribution and hydrocarbon accumulation characteristics of Maokou Formation karst reservoirs in southwestern Sichuan Basin[J]. Special Oil & Gas Reservoirs, 2025, 32(4): 50-57.

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