Study on Sedimentary Microfacies in Chang 9 Member of Pingbei Area in Ordos Basin

Started from regional geologic background,based on core analysis and integratied logging information,the character study of sedimentary microfacies of chang 9 member is developed.The research shows that there are two types of sedimentary sub-facies such as delta front and prodelta and six types of sedimentary microfacies such as subsea distributary channel,interdistributary area,sheet sand,debouch bar,far sand dam and lake clay.Among those microfacies,the subsea distributary channel and debouch bar have a good reservoir property and thye are oil and gas reservoirs.