Sedimentary facies analysis of Yingcheng formation at Xidingjia area in southeastern margin of the Songliao basin

The sedimentary facies research level of the deep level is plain in Southeastern margin of Songliao Basin taking Yingcheng formation of Xidingjia area as an example,and make use of core observation results,combined with logging,seismic data,as well as regional tectonic evolution and sedimentary facies analysis to research sedimentary facies.The results showed that Yingcheng formation mainly developed fan delta,braided river delta,lake and lake facies types,and braided river delta and lacustrine facies are most developed.Yingcheng formation of Xidingjia area mainly shows broad shallow basin as sedimentary characteristics.Southwest steep slope developed fan delta depositional system,the northern slope developed braided river delta system,and the performance of the vertical stacking pattern is from progradation to accretion.The conclusion of the study has important guiding significance for the exploration and resource evaluation of the next step.