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以高分辨率层序地层学原理为指导,通过野外露头剖面、岩心观察、钻井及测井曲线等资料分析,将上干柴沟组划分为2个长期基准面旋回和6个中期基准面旋回,分析了2个级别旋回的结构、叠加样式,在单井层序划分的基础上建立了上干柴沟组层序地层格架对比图。长期基准面旋回结构分布特点与地层之间存在较好的对应关系,位于湖盆中心、地层厚度大的地区主要发育C2型长期基准面旋回结构,而位于湖盆边部、地层相对较薄的地区主要发育C1型长期基准面旋回结构。最后以上干柴沟组层序地层等时对比格架为基础,编制了该区的岩相古地理图。
Guided by the principle of high-resolution sequence stratigraphy, the Upper Ganchaigou Formation is divided into two long-term base-level cycles and six mid-level base-level cycles through analysis of field outcrop sections, core observations, drilling and well logging curves and other data analysis. The structures and superposition patterns of two levels of cycles are analyzed. Based on the single-well sequence division, a comparison chart of sequence stratigraphic framework of Shangganchaigou Formation is established. There is a good correspondence between the distribution characteristics of the long-term base-level cycle structure and the strata, located in the center of the lake basin. The C2-type long-term base-level cycle structure mainly develops in the thick strata, while the strata are relatively thin at the edge of the lake basin Region mainly developed C1 long-term reference plane cycle structure. Finally, based on the isochronous grids of sequence stratigraphy of Ganchaigou Formation, the lithofacies paleogeography map of the area was compiled.