Abstract
The Ordos Basin is a significant oil and gas basin. Region M is located southwest of the Ordos Basin. Its Chang 8<sub>1</sub> sub-member is primarily delta front, with abundant oil, and is the primary exploration and development target series. Deep research into the sedimentary facies of the Chang 8<sub>1</sub> sub-member has implications for oil and gas exploration. The study area is primarily delta facies, which is further subdivided into four microfacies: underwater distributary channel microfacies, underwater distributary channel inter-facies, estuarine bar microfacies, and sheet sand microfacies, based on core observation, logging interpretation results, and other data, combined with previous understanding and regional sedimentary background and other research results. During the Chang8<sub>1</sub> period, the entire area is dominated by multi-phase underwater distributary channel sand that is superimposed vertically and distributed in nearly east-west strips.
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