鄂尔多斯盆地南部延长组长6时期物源状况分析

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

为查明鄂尔多斯盆地南部延长组沉积体系的分布格局等问题,通过常规矿物成分分析、重矿物特征、岩屑特征、地球化学特征和地震剖面等研究方法,对鄂尔多斯盆地南部的物源及源区母岩性质等进行了系统研究。结果表明,盆地南部地区主要受到3大物源主要控制,可进一步再划分出5个次级物源,即东北、北部、西部、西南、南部。古物源与沉积体系具有良好的空间配置关系,决定了盆地长6时期的沉积体系分布格局。沉积物源的研究将有助于油气勘探的部署。

For determining the distribution pattern of the depositional system of Yanchang 1, ormatlon in me soum 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.