For area D of the Ordos Basin, the Yan 9 oil-bearing group were finely divided and compared using the marker layer method, the principle of equal thickness, and the sedimentary cycle analysis method. According to the stratigraphic division results, the plan view of the thickness of the small strata and the structure map of the top of the strata were drawn. It is believed that the Yan93 and Yan91+2 stratums are relatively complete in the whole area and have not suffered denudation. The overall thickness of the formation does not vary widely, and the thickness of the two small layers is mainly about 20m. The nose-like structure at the top of Yan 9 is densely developed, forming multiple rows of nearly east-west nose-like structures, with a structural amplitude less than 25m, and the distribution of rhinoplasty has a certain difference. The distance between rhinoplasty is 3-8km. These nose structures provide favorable trap conditions for hydrocarbon accumulation. The study of the stratigraphic and structural characteristics of the Yan 9 oil-bearing group provides basic geological data for the prediction of later sedimentary facies, sand body distribution, reservoir characteristics and favorable blocks, which is of great significance.
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