海相油气地质2025，Vol.30Issue(2)：157-166,10.DOI:10.3969/j.issn.1672-9854.2025.02.006
四川盆地大安探区须家河组致密气成藏条件与勘探领域
The formation conditions and exploration fields of tight gas of Xujiahe Formation in Da'an exploration area,Sichuan Basin
摘要
Abstract
In order to clarify the conditions for the formation of tight gas reservoirs in complex structural deformation zones and implement the next exploration areas,a systematic study is conducted on the hydrocarbon source rocks,sedimentary systems,tight sandstone reservoirs,and trap conditions of the Xujiahe Formation in Da'an exploration area of Sichuan Basin.The results show that:(1)The Xujiahe Formation in the Da'an exploration area has developed a shallow water delta sedimentary system,and the multi-stage sand bodies of the delta plain braided distributary channels in the 4th and 6th members are stacked and connected.Due to compaction and cementation,the reservoirs were generally dense,and later dissolution and fractures effectively improved the physical properties of the reservoirs.(2)The 3th and 5th members are the main source rock layers in the study area.The source rocks are thick,wide distribution in area,and have high organic matter content,mainly consisting of typeⅢand typeⅡ2 kerogen.Currently,they are in the mature to high mature stage,laying a resource foundation for the formation of tight gas reservoirs in Da'an exploration area.(3)The tight sandstone reservoirs of the 4th and 6th members are interbedded with the source rocks of the 3th and 5th members in an uneven thickness in the vertical direction,forming a lower source-upper reservoir combination,which is conducive to the formation of structural gas reservoirs.The main source rock layers of the 3th and 5th members are developed with"mudstone wrapping sandstone"type meandering river channel sand bodies and tight sandstone reservoirs,forming a self generating and self storing combination,which is conducive to the formation of lens-shaped lithological gas reservoirs.The main part of Danfengchang anticline belt and the north,middle,and south wings of Linjiang syncline,as well as the east wing of Yunjin syncline are proposed as the key replacement areas of structural gas reservoir of the 4th and 6th members in Da'an exploration area.Of the Danfengchang anticline,the north of Laisu syncline,and the central part of Linjiang depression,the 3th and 5th members are integrated with source and reservoir,which is conducive to the formation of a"mudstone wrapping sandstone"type structural-lithological gas reservoir and is a potential exploration area for tight gas reservoirs in the next step.关键词
浅水三角洲/致密砂岩气/成藏模式/勘探领域/须家河组/大安探区/四川盆地Key words
shallow water delta/tight sandstone gas/accumulation model/exploration field/Xujiahe Formation/Da'an exploration area/Sichuan Basin分类
石油、天然气工程引用本文复制引用
罗瑀峰,伍劲,刘少治,厚刚福,刘占国,熊加贝,伍松林,芮昀,陈星渝,袁晓俊,宋兵..四川盆地大安探区须家河组致密气成藏条件与勘探领域[J].海相油气地质,2025,30(2):157-166,10.基金项目
本文受中国石油天然气股份有限公司基础性前瞻性重大科技专项(编号:2023ZZ02)资助 （编号:2023ZZ02）
