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地震层序引自“墨西哥湾密西西比扇的沉积历史、相态与层序地层学”一文,根据该文建立的层序模型,对歧南断阶带明下段进行了曲流河地震层序分析,将该区明下段划分为6个层序,每个层序都以平行连续的强反射不整合面为界.层序内又可分为“V”字型、透镜状叠瓦型、丘状反射型、波状反射型、平行强反射型地震微相;建立了河道相、侧积相、天然堤相、河漫相、泛滥平原相等河流微相.这些地震相与钻井资料确定的沉积相是一致的.利用地震资料对这些微相分层进行沉积环境分析,结果表明沉积微相受地形构造控制,而地层沉积则是地形、构造、沉积微相等多重因素作用的结果.
Seismic sequence is quoted from “The sedimentary history, phase state and sequence stratigraphy of the Mississippi fan in the Gulf of Mexico”. Based on the sequence model established in this paper, , And the next lower section of the area is divided into 6 sequences, each sequence is bounded by parallel continuous strong reflection unconformities. The sequence can be divided into “V” shape, lenticular tile type and mound Like reflections, wavy reflections and parallel strong reflection seismic microfacies, and established river facies, lateral facies, natural dike facies, river facies and floodplain equal river microfacies.These seismic facies and drilling data to determine the sedimentary facies Is consistent.Using seismic data to analyze the sedimentary environment of these microfacies stratification, the results show that the sedimentary microfacies are controlled by the topographic structure, while the stratigraphic sedimentation is the result of multiple factors such as topography, structure and sedimentary microfacies.