Fine description on sedimentary micro-facies of typical profile platform edge reef from Changxing formation in northeast Sichuan

In order to make a fine description of microfacies char-acteristics of organic reefs in the northeastern area of Sichuan,based on thin sections identification,the microfacies characteristics of organic reefs of Panlong hole and Yanggu hole have been studied.The results indicate multiple reef circles were developed on platform edge reef of Panlong hole and Yanggu hole,and the organic reefs in Panlong hole developed better than those in Yanggu hole.In Panlong hole,the frame stone and bond stone were developed.Due to dolomitization development,the sponge frame and the filler composition between frame can also see dolomitization.In Yanggu hole,barrier reef and bonding reef were mainly developed,with a high content of plaster and no dolomitization development.As for organic reefs,even in the same platform edge,the development characteristics and material composition are of obvious difference,and the difference directly affects the transformation of the late diagenesis and reef reservoir performance difference.