断陷湖盆陡坡边缘沉积体系研究——以保山气田羊邑组二段—三段为例
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摘要
通过沉积岩(物)与沉积环境之间的辩证关系,对沉积岩的岩性特征(颜色、岩石类型、岩石结构、粘土矿物、岩相组合)的分析研究,结合沉积相在测井和地震剖面上的响应特征,确认了保山气田羊邑组二段—三段的微相类型。研究认为:该区主要发育了扇三角洲前缘亚相中的水下分流河道、分流河道间、前缘席状砂、河口坝等微相,以及浅湖亚相中的浅湖泥和浅湖漫流席状砂。并详细剖析了各骨架微相的沉积特征,指出了发育在水下分流河道、河口坝和前缘席状砂为该区最有利的储集砂体,为保山气田储层评价奠定了可靠的地质基础。
Based on the relationship between sedimentary rocks and depositional environments, and combined with the response characteristics of sedimentary facies in logging and seismic profiles, microfacies types in the 2nd -3rd Member of Yangyi Formation in Baoshan Gasfield are confirmed through the analysis of lithologic characteristics of sedimentary rocks (color, type, structure, clay mineral and lithofacies assemblage). The research indicates that several microfacies developed in fan-delta-front subfacies, including subaqueous distributary channels, interdistributary channels, frontal sheet sand and mouth bar, along with shallow-lacustrine mud and shallow-lacustrine unconcentrated-flow sheet sands developed in shallow lacustrine subfacies. Moreover, depositional features of framework microfacies were discussed in detail. At last, the paper states the most favorable reservoir sandbody mainly develops in the subaqueous distributary channel, mouth bar as well as frontal sheet sand. All researches provide a reliable geologic foundation for reservoir evaluation of Baoshan Gasfield.
Based on the relationship between sedimentary rocks and depositional environments, and combined with the response characteristics of sedimentary facies in logging and seismic profiles, microfacies types in the 2nd -3rd Member of Yangyi Formation in Baoshan Gasfield are confirmed through the analysis of lithologic characteristics of sedimentary rocks (color, type, structure, clay mineral and lithofacies assemblage). The research indicates that several microfacies developed in fan-delta-front subfacies, including subaqueous distributary channels, interdistributary channels, frontal sheet sand and mouth bar, along with shallow-lacustrine mud and shallow-lacustrine unconcentrated-flow sheet sands developed in shallow lacustrine subfacies. Moreover, depositional features of framework microfacies were discussed in detail. At last, the paper states the most favorable reservoir sandbody mainly develops in the subaqueous distributary channel, mouth bar as well as frontal sheet sand. All researches provide a reliable geologic foundation for reservoir evaluation of Baoshan Gasfield.
引文
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2汪彦,彭军,李凯军,等.高分辨率层序地层学在保山盆地永铸街凸起构造—沉积演化中的应用[J].天然气地球科学,2005,16(6):741-746.
3赵永胜,宋振亚,戴苏兰,等.保山断陷盆地第三系沉积体系及含气远景[J].成都理工学院学报,1998,25(1):94-104.
4王益友.几种地化标志在金湖凹陷阜宁群沉积环境中的应用[J].同济大学学报,1979,18(2):51-60.
5赵永胜,宋振亚,温景萍,等.保山盆地湖相泥岩微量元素分布与古盐度定量评价[J].海洋与湖泊,1998,29(4):409-415.
6党D,赵虹,李文厚,等.安塞油田延长组长6油层组沉积微相特征[J].天然气地球科学,2004,15(6):597-600.
7完颜容,杨占龙,魏立花,等.吐哈盆地台北西部中侏罗统三间房—七克台组沉积相特征[J].天然气地球科学,2006,17(5):693-697.
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