Platform margin facies belts surrounding Kaijiang-Liangping continental shelf are favorable for the development of large gas field.The distribution of the continental shelf controls the distribution of reef and shoal facies belts.In order to accurately map the distribution of reef and shoal facies belts

the core

cutting and thin section data were integrated to systematically analyze the grain size

fossil composition and structure types.Moreover

3D seismic data were used to predict the appearance and distribution of the reefs and shoals

and the sedimentary faces in Changxing Formation were mapped by integrating drilling and outcrops data.The nearly NS-trending dome-shaped Jianzhuxi bioherm is of typical platform margin facies.The shoal-facies dolomite at the bottom of the bioherm is large in lateral distribution and its major part is located in the east of the bioherm and is closely interconnected with the platform.The Kaijiang-Liangping continental shelf extends southeastwards across the western part of the Jianzhuxi bioherm and is connected with to West Hubei marine basin.The Jianzhuxi bioherm is located in the same platform margin facies belts with that of the bioherms in Puguang areas.