Sedimentary microphase study of Shanxi formation in Yan 113 well area,Ordos Basin
This paper comprehensively applies the data of core,logging and analytical test-ing,and takes the Shanxi formation in Yan 113 well area of Ordos Basin as the research ob-ject,summarizes the petrological characteristics,mudstone color,grain size analysis,sedi-mentary stratification and other phase signatures,and carries out the research on the type and characteristics of sedimentary microphase and sedimentary phase spreading law of the Shanxi formation in the Yan 113 well area.The results of the study show that the whole study area is a delta front sedimentary environment,including two sedimentary microphases,the underwater diversion channel and the diversion bay.The underwater diversion channel in the Shan 2 section spreads in a north-east-south-west direction,with a wide channel and a large distribution range.As the sea level drops significantly in the Shan 1 section,the un-derwater diversion channels at the front edge of the delta extend further to the south,and the four main channels are connected from north to south,and the channels narrow and bifurcate to the south,and the underwater diversion channel sedimentary microphase is the main reservoir phase zone in the study area.
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