摘要
为明确准噶尔盆地盆1井西凹陷及周缘深层二叠系超压形成机制及演化特征,基于钻井、测井、实测地层压力等资料,运用测井曲线组合分析法和交会图版法以及盆地模拟技术,对超压成因机制及演化特征进行分析,并定量表征目的层不同成因类型超压的贡献率。结果表明:①研究区深层二叠系不同岩性地层超压成因具有明显差异,其中风城组和下乌尔禾组烃源岩层超压成因主要为生烃和欠压实作用,其中生烃作用占主导;泥岩盖层超压成因主要为欠压实作用;而风城组和下乌尔禾组储层超压成因主要为超压传递和欠压实作用。②研究区风城组烃源岩生烃增压自早二叠世开始,现今达到最大,不同构造部位增压大小差别较小,烃源岩层超压主要分布于39.43~49.16MPa,但其贡献率具有明显差异,凸起区较大,而凹陷区较小;凸起区和凹陷区生烃增压对总超压贡献率分别为84.49%~94.41%和65%~67.3%,研究区下乌尔禾组烃源岩生烃增压大小与风城组具有相似的规律;欠压实作用对泥岩盖层超压的贡献率一般为100%。③研究区二叠系储层超压传递增压主要形成于晚侏罗世至早白垩世以及古近纪至今,其贡献率在不同凸起区存在明显差异,达巴松凸起和石西凸起分别为21.86%~23.35%和100%。厘清研究区深层、超深层超压的分布规律,可以为盆地新区的进一步开发提供依据。
To clarify the formation mechanism and evolution characteristics of the deep Permian overpressure in western Well Pen-1 Sag and its periphery in Junggar Basin,based on the data of drilling,logging,and measured formation pressure,the formation mechanism and evolution characteristics of overpressure were comprehensively studied,and the contribution rate of different types of overpressure genesis in the target layer was quantitatively characterized by using the methods of analysis of well logging curve combination,cross plots,and basin simulation.The results show that①the overpressure genesises of different lithologies of the deep Permian in the study area have obvious differences,among which the overpressure genesises of source rock of Fengcheng Formation and the Lower Wuerhe Formation are mainly hydrocarbon generation and disequilibrium compaction,with hydrocarbon generation dominating;the overpressure genesis of mudstone caprock is mainly disequilibrium compaction,while the overpressure genesises of reservoirs of the Fengcheng Formation and Lower Wuerhe Formation are mainly overpressure transfer and disequilibrium compaction.②The overpressure induced by hydrocarbon generation of Fengcheng Formation in the study area has appeared since the Early Permian and reached the maximum at present,and there are little differences in the size of the pressurization among different tectonic positions;the overpressure of the source rock is mainly distributed in the range of 39.43-49.16 MPa,but its contribution rate has obvious differences,with larger salients and smaller sags,and the contribution rates of pressurization induced by hydrocarbon generation in salients and sags to the total overpressure are 84.49%-94.41%and 65%-67.3%,respectively.The pressurization induced by hydrocarbon generation in the source rock of the Lower Wuerhe Formation has a similar size to that of Fengcheng Formation.The contribution rate of disequilibrium compaction to the overpressure in the mudstone caprock is basically 100%.③Overpressure transfer pressurizations in the Permian reservoir of the study area are mainly formed from the Late Jurassic to Early Cretaceous and since the Paleoproterozoic to now,and their contribution rates vary significantly in different salient areas,with 21.86%-23.35%and 100%in Dabasong Salient and Shixi Salient,respectively.Clarifying the overpressure distribution law of deep and ultra-deep formations in the study area can provide a basis for the further development of the new basin.
作者
苟宇杰
张凤奇
江青春
鲁雪松
刘刚
卫延召
刘海磊
蒋文龙
GOU Yujie;ZHANG Fengqi;JIANG Qingchun;LU Xuesong;LIU Gang;WEI Yanzhao;LIU Hailei;JIANG Wenlong(School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an City,Shannxi Province,710065,China;Shannxi Key Laboratory of Petroleum Accumulation Geology,Xi’an City,Shannxi Province,710065,China;Research Institute of Petroleum Exploration&Development,PetroChina,Beijing City,100083,China;Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang,834000,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2024年第3期16-30,共15页
Petroleum Geology and Recovery Efficiency
基金
国家自然科学基金面上项目“压力—应力耦合对前陆冲断带深层—超深层碎屑岩储层异常高原生孔隙的保存机制研究”(42172164)
中国石油前瞻性基础性科技攻关项目“深层超深层油气成藏过程与油气分布规律研究”(2021DJ0203)。
关键词
深层
超压成因
演化特征
定量评价
盆1井西凹陷
准噶尔盆地
deep formation
overpressure genesis
evolution characteristics
quantitative evaluation
western Well Pen-1 sag
Junggar Basin
作者简介
苟宇杰(1999—),男,陕西宝鸡人,在读硕士研究生,从事油气成藏地质学研究。E-mail:1520759391@qq.com。
