【摘要】 垦利10-1油田沙三上亚段构造复杂、断层发育、储层横向变化快,使得对该亚段内沉积体系识不清楚。以明确沙三中亚段沉积相类型以及特征为目的,以沉积学和地质学理论为指导,通过对岩石颜色、岩性特征、沉积构造、地震响应特征的综合分析,认为垦利10-1油田沙三上亚段发育辫状河三角洲前缘亚相,在该亚相内利用测井相标志可进一步识别出水下分流河道、河口坝、席状砂以及水下分流河道间等4种微相;在沉积微相特征和地震属性的综合研究基础之上,剖析了沙三上亚段辫状河三角洲的时空演化规律,认为沙三上亚段辫状河三角洲由多期朵叶体相互叠置而成,平面上由北向南展布,从低位体系域、湖侵体系域到高位体系域的垂向演化序列来看,朵叶体的发育程度呈现由大变小再变大的特征,反应了进积、退积再进积(加积)的沉积样式。最后依据沉积相的时空演化特征,总结了沙三上亚段辫状河三角洲的沉积模式。研究成果可为油田下一步滚动勘探提供地质参考依据。更多还原

【Abstract】 Because of complicated structure, existing faults, strong lateral reservoir heterogeneity, the understanding of sedimentary system of the upper Third Member of Shahejie Formation of KenLi 10-1 Oilfield is not clear. This paper aims at studying sedimentary facies types and characteristics. Taking Sedimentology and Geology theory as a guide and through comprehensive analyses of rock colors, lithologies, sedimentary structures and seismic responses, this paper concludes that the target zone develops braided-river delta front sedimentation which can be further classified into underwater distributary channel, mouth bar, sheet sand and tributary bay according to logging facies. Based on the comprehensive studies of sedimentary microfacies and seismic attributes, this paper looks into the space-time evolution of the braided-river delta of the upper Third Member of Shahejie Formation. The results show that the delta is composed by the superposition of North-South trending lobe bodies. And according to the vertical evolution sequence of lowstand, lake invasion and highstand system tract, the lobe development goes through a large-small-large changing process, indicating a progradation-retrogradation-progradation depositional pattern. Finally, according to space-time evolution characteristics, the sedimentary model of the braided-river delta of the upper Third Member of Shahejie Formation is concluded. The research results can provide geological reference for the next step of rolling exploration of the oilfield.更多还原