Seismic Facies Characteristics and Sedimentary Facies Analysis of NA Oil Formation in Wenchang Formation of Wellblock A in Huizhou Depression

The Paleogene Wenchang Formation of Huizhou Sag was at the early exploration stage,there were little drilling data.By analyzing the lithology and core sedimentary structure from Well A-1 in Wellblock A,it was proven that braided river delta deposits were mainly developed in the well.On the basis stated,it is found out that the seismic facies includes wedge-shaped seismic facies,parallel-subparallel seismic facies,foreset seismic facies and concave filling seismic facies.The sedimentary facies include braided river delta plain sub-facies,braided river delta front sub-facies,fan delta facies,shallow lake and shore facies.It provides a solid base for the seismic exploration of the Paleogene Wenchang Formation in the area.