Sequence Stratigraphy and Sedimentary Facies in the Third Member of Shahejie Formation of Huanxiling Area in the West Depression,Liaohe Basin

With the high resolution sequence stratigraphy and the correlation analysis of cores,logs and seismic data,different orders of stratigraphic sequence interface were identified for the third member of Shahejie Formation of Huanxiling Area in the west depression of Liaohe Basin,the stratigraphic framework was built,the types of sedimentary facies,evolution and distribution of the framework were discussed,and the distribution of favorable sedimentary reservoir was forecasted.The results showed that the recognition marks of stratigraphic sequence interface were the significant changes of lithology,color,type of sedimentary facies and electricity character;Shahejie Formation of Huanxiling Area was divided into 6 three-order strata sequences and 12 four-order strata sequences;fan dalta,sublacustrine fan and lacustrine facies were developed in the third member of Shahejie Formation,fan dalta was developed in the upper subsection,sublacustrine fan was widely developed in the middle subsection,deep,littoral and shallow lacustrine facies was mainly developed in the lower subsection;reservoir physical properties of sublacustrine fan in the middle subsection of the third member of Shahejie Formation and fan dalta in the lower subsection were best,and it was the favorable sedimentary reservoir.