四川盆地营山地区须家河组二段致密砂岩气藏特征及有利目标区  

Characteristics of tight sandstone gas reservoirs and favorable targets in Xu2 Member of Xujiahe Formation in Yingshan area of Sichuan Basin

作　　者：王有智[1,2] WANG Youzhi(Exploration and Development Research Institute of PetroChina Daqing Oilfield Co.,Ltd.,Daqing 163712,China;College of Energy,Chengdu University of Technology,Chengdu 611200,China)

机构地区：[1]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]成都理工大学能源学院,四川成都611200

出　　处：《大庆石油地质与开发》2025年第2期19-27,共9页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“四川盆地大庆探区侏罗系陆相页岩油富集机理与关键评价技术研究”(2022DJ1809)。

摘　　要：为了搞清四川盆地须家河组二段致密气藏气水关系和富集规律,综合实验分析、测井和地震多方面资料,基于高分辨率层序地层学理论分析测井曲线响应特征,识别不同级别层序界面和湖泛面类型。结果表明:须二段包括1个长期基准面旋回和6个中期基准面旋回,MSCl―MSC4旋回是上升旋回,为退积式岩性组合;MSC5旋回―MSC6旋回是下降旋回,为进积式岩性组合;上升旋回岩石组合具有较好的抗压性和物性,经历构造调整后,气水分异较为彻底,为构造气藏;在下降旋回中,机械压实作用较强,储层原生粒间孔隙被严重破坏,油气大量注入储层时期与储层致密演化耦合,具有边致密边成藏特征,使得下降旋回整体含气、规模富集,是未来营山构造须二段储量升级的有利目的层。研究成果可为营山地区致密储层发育的有利区域筛选及下一步致密气藏有利目标区勘探提供依据。In order to understand gas-water relationship and enrichment laws of tight gas reservoirs in Xu2 Member of Xujiahe Formation of Sichuan Basin,response characteristics of logging curves are analyzed based on high-reso-lution sequence stratigraphy theory integrating experimental analysis,logging and seismic data to identify different orders of sequence boundaries and flooding surfaces types.The results show that X2 Member includes 1 long-term base-level cycle and 6 mid-term base-level cycles.MSC1-MSC4 mid-term cycles is a long-term rise cycle with re-gressive lithologic assemblages.MSC5-MSC6 mid-term cycle is a long-term fall cycle with transgressive lithologic assemblages.Lithologic assemblages of rise cycle have high compaction resistance and good properties.Structural adjustments causes thorough gas-water differentiation,forming structural gas reservoir.Mechanical compaction is strong in fall cycle,resulting in severe destruction of primary intergranular porosity of reservoir.The period of large amount of oil and gas charging into reservoir couples with reservoir tightening evolution,with characteristics of si-multaneous tightening and accumulation,and with overall gas-bearing and large-scale enrichment in fall cycle,making it favorable target layer for future reserves upgrading of Xu2 Member in Yingshan structure.The research provides evidence for selection of favorable tight reservoirs developed areas in Yingshan area,as well as for further exploration for favorable target areas of tight gas reservoirs.

关 键 词：致密砂岩 富集模式 须二段 营山构造 四川盆地 川东北地区 

分 类 号：TE122[石油与天然气工程—油气勘探]