Depositional systems of the Neogene Shahejie Formation in the Qingdong depression

The Neogene Shahejie Formation is interpreted as the important target horizons for the hydrocarbon exploration in the Qingdong depression. Two depositional systems are distinguished for the Formation in the light of cores, well logs and seismic data, and six sedimentary facies are discriminated, including the fan delta, delta, beach bar, nearshore submarine fan, sublacustrine fan and lake facies. The results of research on the types and characteristics of the sedimentary facies in this study may provide an important basis for the prediction of the favourable hydrocarbon reservoirs and hydrocarbon exploration and development in the Qingdong depression in the future.