川中地区侏罗系沙溪庙组远源型致密砂岩气充注能力定量评价

Quantitative evaluation of gas charging capacity of tight sandstone gas in Shaximiao Formation of Jurassic System of the central Sichuan Basin

摘要

侏罗系沙溪庙组远源型致密砂岩气是四川盆地油气勘探的关键领域之一,断砂配置控制下的天然气充注能力控制沙溪庙组天然气成藏与富集规模,亟需对天然气沿断层向不同砂体的选择性充注进行定量评价。以川中地区为例,在分析天然气藏特征与来源基础上,基于源-断-砂配置关系及其演化,建立天然气选择性充注的定量评价模型,确定沙溪庙组致密砂岩气充注能力。结果表明:川中地区沙溪庙组致密砂岩气主要来源于下伏须家河组烃源岩,沙溪庙组不同河道砂体的天然气充注能力存在显著差异,其中龙泉山断层东部8号砂组的充注能力最大,角①断层南部8号砂组次之,对沙溪庙组天然气成藏与富集起到决定性作用;源-断-砂高效匹配是远源型致密砂岩气成藏的关键,其中源-断配置控制了天然气来源的规模大小,断-砂配置决定天然气充注的有效性。

Abstract

Tight sandstone gas reservoirs located far from source rocks in the Jurassic Shaximiao Formation represent an important target for oil and gas exploration in the Sichuan Basin. The natural gas charging capacity controlled by the fault-sand configuration plays a critical role in governing the scale of gas accumulation and enrichment in the Shaximiao Formation. However, quantitative evaluation of the selective charging capacity of natural gas into different sandstone bodies remains limited. Taking the central Sichuan Basin as an example, this study investigates the characteristics and origins of natural gas reservoirs, as well as the evolution of source-fault-sand configuration relationships, to quantitatively evaluate natural gas charging processes and determine the charging capacity of tight sandstone reservoirs in the Shaximiao Formation. The results indicate that the tight sandstone gas in the Shaximiao Formation of the central Sichuan Basin is mainly sourced from the Xujiahe Formation. Significant differences exist in the gas charging capacities of different fluvial sandstone bodies within the Shaximiao Formation. Among them, the No. 8 sandstone member east of the Longquanshan Fault exhibits the highest charging capacity, followed by the No. 8 sandstone member south of the Jiao① Fault. These sandstone bodies play a decisive role in gas accumulation and enrichment within the Shaximiao Formation. Comprehensive analysis demonstrates that efficient source-fault-sand coupling is the key factor controlling tight sandstone gas accumulation far from source rocks. Specifically, the source-fault configuration controls the scale of gas supply, while the fault-sand configuration determines the effectiveness of gas charging.

关键词

致密砂岩气 / 油气充注定量评价 / 侏罗系沙溪庙组 / 四川盆地

Key words

tight sandstone gas / quantitative evaluation of oil and gas charging capacity / Jurassic Shaximiao Formation / Sichuan Basin

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基金资助

国家科技重大专项(2025ZD1400404-04)