鄂尔多斯盆地东南部晚三叠世延长期沉积相及岩相古地理演化特征

鄂尔多斯盆地东南部是目前研究的一个重点区域,为了查明该地区延长期沉积相、岩相古地理的特征及演化规律,在大量钻井、测井、野外露头及岩心资料的基础上,详细分析了研究区延长期沉积相在平面及纵向上的分布特征和规律。研究表明,鄂尔多斯盆地晚三叠世延长期的沉积代表着一个完整的陆相湖盆发育过程,研究区延长组发育三角洲相和湖泊相两种沉积相,以浅湖和三角洲前缘为主,物源主要有东北和南部两个方向,并总结出各沉积期的沉积相及岩相古地理特征,对有利区判断及下一步勘探开发具有指导性意义。

Sedimentary facies and litho-paleogeographic evolution during the deposition of the Yanchang formation in the late Triassic in the southeast of Ordos basin

Southeast of Erdos basin is a key study area, in order to identify the sedimentary facies and litho-paleogeographic evolution during the deposition of the Yanchang formation in the late Triassic, based on large quantities of drilling, logging, field outcrop and core data, the plane and vertical characteristics and the law of sedimentary facies has been analyzed. The study showed that Ordos late Triassic in Yanchang formation sedimentary represented a complete lacustrine basin development process. The study area developed delta facies and lacustrine facies, which are mainly shallow lake and delta front, the material source distributed in the northeast and south direction. In the article, the deposition of sedimentary facies and paleogeography is summarized, which has guiding significance for the judgment of favorable area and the following exploration.