The sequence stratigraphy and sedimentary facies analysis of Lingshui Formation in Qiongdongnan Basin

Using the high resolution sequence stratigraphy and the correlation analysis of cores, logs and seismic data, the authors identified various stratigraphic sequence interfaces in Lingshui Formation of Qiongdongnan Basin, built the stratigraphic framework, and discussed the sedimentary facies types and the evolution and distribution of the framework, and forecast the distribution of favorable sedimentary reservoirs. The results show that the recognition criteria of stratigraphic sequence interface seem to be the significant changes of lithology and color. The Lingshui Formation of Qiongdongnan Basin is divided into threeorder strata sequences (Els1, Els2, and Els3). Five types of sedimentary facies are developed in this three sets of third- order sequences, which include braided river delta, fan delta, littoral area, continental shelf and carbonate platform.