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根据多种资料在陕甘宁盆地中部马五段上部划分出8个准层序，对每个准层序作了详细的描述，它们大多与自然伽玛曲线对应良好，且均为米级规模，顶部多为含膏云坪微相，反映持续暴露的证据充分，认为它们是由他放回作用形成的。受海平面升降的控制，准层序内δ13C值先升后降，并且由于其形成的早期和晚期石膏和石盐含量各不相同准层序内孔隙度和残余含盐量逐渐升高。准层序内泥质和有机质的含量变化也导致酸不溶物含量逐渐降低。岩石的高孔隙带多分布于暴露型准层序的上部或顶部。
Based on a variety of data, 8 quasi-sequences are divided into upper parts of the Ma-5 Member in the central part of the Shaan-Gan-Ning Basin. Each quasi-sequence is described in detail. Most of them are in good correspondence with the natural gamma curves, , Mostly with the top of the cream clouds Ping, reflecting the evidence of sustained exposure, that they are formed by the role of his back. Under the control of sea level rise and fall, δ13C values first and then decrease in the quasi-sequence, and due to the different contents of gypsum and rock salt in the early and late stages, the porosity and residual salt content gradually increase in the quasi-sequence. Changes in the content of argillaceous and organic matter in the quasi-sequence also lead to the gradual decrease of the acid-insoluble content. The high porosity zones of the rock are mostly distributed above or at the top of the exposed quasi-sequence.