海相油气地质2026，Vol.31Issue(2)：202-210,9.DOI:10.3969/j.issn.1672-9854.2026.02.008
四川盆地西缘新元古界张性结构特征及勘探意义
The characteristics of Neoproterozoic extensional structures in western Sichuan Basin and its exploration enlightenment
摘要
Abstract
The Sichuan Basin is rich in oil and gas resources,with its basement structure controlling hydrocarbon distribution from the ultra-deep Sinian to the shallow Jurassic Strata.With the application of ultra-deep gravity-magnetic-electric-seismic joint exploration techniques since 2010,the Neoproterozoic extensional structures in the Sichuan Basin has been continuously confirmed through exploration.Based on the high-resolution gravity-magnetic-electric data and"double-high"(high fidelity and high resolution)seismic data,combined with the outcrop observations along the basin margin and borehole data from 8 wells drilled into the Sinian Doushantuo Formation,a comprehensive interpretation study is carried out.It is proposed that the Sichuan Basin has developed"western Sichuan rift",which has mainly experienced three evolutionary stages from a rift to a depression.Stage 1:Nanhua rift stage,which was dominated by multiple near NE-trending horsts and grabens.Stage 2:the intra-cratonic depression stage happened during the deposition of the Sinian Doushantuo Formation,which was formed by merging the Northwest Sichuan Depression and the Central Sichuan Uplift.Stage 3:intra-cratonic depression stage happened during the deposition of the Sinian Dengying Formation,forming a nearly SN-trending extensional trough which opens towards northwest.Further study shows that strike-slip faults could easily occur during the evolution of the western Sichuan rift.The rift provides conditions for hydrocarbon accumulation in the Nanhua-Sinian Strata where oil and gas can be generated by lower strata,transported by faults and stored by upper strata.The Nanhua-Sinian petroleum system in the western-central Sichuan area is a new potential exploration area.关键词
裂谷/克拉通内坳陷/南华系/震旦系/新元古界/四川盆地Key words
rift/intra-cratonic depression/Nanhua System/Sinian System/Neoproterozoic/Sichuan Basin分类
能源科技引用本文复制引用
马奎,谭开俊,王文之,肖东,陈华,陈伟,黎枫佶,张本健,钟勇,周刚,王玥蕴,梁虹,徐少立,张新,武鲁亚..四川盆地西缘新元古界张性结构特征及勘探意义[J].海相油气地质,2026,31(2):202-210,9.基金项目
本文受中国石油西南油气田公司科技项目"蓬莱气区震旦系灯影组天然气来源及成藏过程研究"(编号:20230301-25)资助 （编号:20230301-25）
