Research on the source direction in Upper 4th Member of Shahejie Formation in Shengtuo area

Abstract：The study of sediment source is significant in understanding and identifying favorable sedimentary facies belts and distribution of reservoir sands in the study area as well as in prospecting for favorable oil and gas reservoirs. Because the exploration extent of the 4th Member of Shahejie Formation is at a relatively low level in Shengtuo area，previous researches on the purpose layer sedimentary source system is very insufficient. The authors studied the source direction of the Upper 4th Member of Shahejie Formation in Shengtuo area in such aspects as palaeo-geomorphologic analysis, lithic fragment type of sediments, proportion of sandstone and characteristic element type, and distribution studies from seismic, logging and geochemical data. Combined with the source indexes of characteristic elements, the authors evaluated quantitatively the source system of the Upper 4th Member of Shahejie Formation in this area. According to the result, the authors point out that the source of the Upper 4th Member of Shahejie Formation was derived from the uplifted side directly as well as the source system from the accommodation zone of Shengbei and Tuo94 faults. Other sources came along the transfer zone of Shengbei and Tuo94 fault.