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通过地震层序划分及沉积剖面原形恢复建立层序地层格架,同时结合沙二段第3砂层组(S2-3砂层组)地震反射特征进行地震相识别并命名。通过地震相—沉积相分析,确定S2-3砂层组发育扇三角洲—湖泊沉积体系,主要有扇三角洲平原、扇三角洲前缘、前扇三角洲、斜坡扇、盆地扇5种沉积亚相。S2-3砂层组沉积相带的确定,对于深入油气勘探具有指导意义。
The sequence stratigraphic framework was established by seismic sequence division and the prototype of sedimentary section. At the same time, the seismic facies were identified and named according to the seismic reflection features of the second sand group (S2-3 sand group) in the second member of Shahejie Formation. Based on the analysis of seismic facies-sedimentary facies, it is confirmed that the delta-3 sedimentary system in the S2-3 sandstone group is mainly composed of fan delta plain, fan delta front, front fan delta, ramp fan and basin fan. The determination of sedimentary facies belt in S2-3 sandstone group is instructive for further petroleum exploration.