Sedimentary features of the submarine fans in the Lower Cretaceous Arxan Formation,Abei depression,Nei Mongol

The present paper gives a detailed description of sedimentary structures,grain sizes,heavy minerals and electrical properties of the submarine fans in the Lower Cretaceous Arxan Formation as important reservoir intervals in the Abei depression,Eren Basin.The Arxan Formation is divided into two third-order sequences with the aid of sequence stratigraphic analysis.The plans of the fans have been constructed on the basis of the preceding third-order sequences,well logs and seismic data.The depositional areas are delineated for the three sedimentary subfacies,i.e.proximal fan,midfan and distal fan.The sedimentary model is formulated for the submarine fans in the study area.