Sediment Provenance Analysis of the Chang 6 Oil-bearing of Yanchang Formation in the South of Ordos Basin

For determining the distribution pattern of the depositional system of Yanchang Formation in the south of Ordos basin , the authors did a systematic research on the provenance and the characteristics of the mother rock by many methods such as the analysis of rocks and minerals , heavy mineral analysis, rock fragment character, geochemical and seismic profile anlysis etc. . The results indicate that there is mainly controlled by three great sediment source regions in the south of Ordos basin, and more detailed divide five sub-sources, which are from northeast, north, west, southwest and south. Provenance have favorable spatial combination with depositional system and determine the depositional system pattern of Chang6 oil-bearing. Provenance is useful to reasonable deployment of oil-gas exploration.