地质科学2026，Vol.61Issue(2)：454-467,14.DOI:10.12017/dzkx.2026.031
潮坪相碳酸盐岩气藏地质特征:以四川盆地西部坳陷中三叠统雷口坡组为例
Gas reservoir characteristics of tidal flat carbonate:A case study from the Middle Triassic Leikoupo Formation in the western depression of Sichuan Basin
摘要
Abstract
Over the long term,the exploration direction of marine carbonate rocks in Sichuan Basin is mainly to find"reef-shoal type"gas reservoirs and"karst type"gas reserviors.The discovery of large-scale tidal flat carbonate reservoirs and new gas field in the Middle Triassic Leikoupo Formation in western Sichuan Depression proves that tidal flat carbonate gas reservoirs also have important exploration value.Therefore,it is especially necessary to summarize its accumulation characteristics and distribution pattern.In this paper,characteristics of gas reservoir formation of tidal flat carbonate in Leikoupo Formation,western Sichuan Depression are thoroughly studied and summarized.1)In terms of reservoir,tidal flat facies of carbonate rocks develop not only conventional granular dolomite,but also large-scale microbial dolomite which makes a great contribution to the reservoir.The reservoir is characterized by thin,multi-layered superposition and stable lateral distribution.2)In terms of hydrocarbon source,multi-source hydrocarbon supply is the basis for regional accumulation.The Leikoupo Formation in western Sichuan Depression not only developed its own source rocks,but also developed the distal main source rocks of the underlying Permian and the secondary argillous source rocks of the Maantang Formation and Xiaotangzi Formation overlying.3)In terms of hydrocarbon migration,faults and fractures form a network transport system in various combinations,providing migration channels for regional oil and gas accumulation.Oil and gas accumulation is controlled by both structure and stratum,and various types of gas reservoirs are formed in the positive tectonic zone and slope zone.The process of oil and gas accumulation is manifested as early oil and gas accumulation and late adjustment.There is breakthrough of tidal flat facies carbonate gas reservoirs in the theoretical understanding and exploration concept of reservoir formation,hydrocarbon generation and accumulation,which has reference significance for natural gas exploration in the marine field of Sichuan Basin and exploration with similar geological background at home and abroad.关键词
四川盆地/川西坳陷/雷口坡组/潮坪相/白云岩/气藏特征Key words
Sichuan Basin/Western Sichuan Depression/Leikoupo Formation/Tidal flat facies/Dolomite/Gas reservoir characteristics分类
能源科技引用本文复制引用
宋晓波,苏成鹏,刘勇,隆轲,王琼仙,李蓉..潮坪相碳酸盐岩气藏地质特征:以四川盆地西部坳陷中三叠统雷口坡组为例[J].地质科学,2026,61(2):454-467,14.基金项目
中国石化科技攻关项目群下属课题项目(编号:P20059-3)和中国石化重大科技项目(编号:P23221)资助 （编号:P20059-3）
