Characteristic of sedimentary microfacies of sandstone Group 1 of Sartu oil-bearing layer at Haituozi area in the South of Songliao Basin

By comprehensively applying the data of core, logging, seismic and grain size analysis, the sedimentary microfacies of sandstone Group 1 in Sartu oil\|bearing layer of Haituozi area in the south of Songliao Basin are analyzed according to the sedimentology and seismic stratigraphy. The main sedimentary facies in this area include lacustrine facies and gravity flow facies. Lacustrine facies is mainly shallow lacustrine subfacies which containes mud\|flat, sand\|flat and mud\|sand mixed\|flat microfacies, and the dominant microfacies is mud\|sand mixed\|flat. Gravity flow channel and gravity flow fan microfacies are identified from the gravity flow facies. The regions developing gravity flow facies are favorable for oil pool formation.