Provenance System Analysis of Yanchang Formation in Fuxian Area of Ordos Basin

The oil and gas exploration of Yanchang Formation in Fuxian area has been constrained by the issue of sediment provenance.The authors make full use of the outcrop,borehole and seismic data of the study area to analysis the six kinds of key parameters indicating the direction of paleo-provenance-such as actual measured paleocurrent directions,sand distributed system directions,spatial distribution of extreme exposure signs(coal) and overlying water mark(oil shale),assemblages and distribution characteristics of heavy minerals,foreset structure of delta depositional system(seismic section),regional paleotectonic and paleogeographic characteristics of Ordos basin.Comprehensive studies show that the sediments of Yanchang Formation in Fuxian area come from the northeast of Ordos basin,and there is no provenance system from the south of the study area.