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一直以来红层是渤南洼陷沙四上、下段地层划分标准。本文认为T7是沙四段下部的反射相位,T7之下应该是沙四段与孔店组之间的界面,岩性上沙四上为一套膏泥岩、灰岩与泥岩的半浅湖相沉积,沙四下为两组正旋回沉积的砂泥岩互层,通过地震相位与岩电特征结合,对该洼陷的沙四上、下段地层进行了重新划分,并提出了该洼陷沙四段的成藏模式。
Red beds have always been the Bonan Sag depression sand upper and lower strata division criteria. This paper argues that T7 is the reflection phase of the lower part of Sha 4 Member. Under T 7, it should be the interface between Sha 4 member and Kongdian Formation. Upper part of lithology is a set of semi-shallow lacustrine facies of gypsum, limestone and mudstone Sediment and sandstones are two interbedded sandstone and mudstone that are cyclically deposited. Through the combination of seismic phase and rock electrical characteristics, the upper and lower strata of Shahejie Formation in this depression are re-divided, Segment of the accumulation mode.