摘要
Abstract
The delta front subfacies in the delta depositional system predominates in the lower submember of the third member of the Shahejie Formation in the Wei-2 block, Weicheng Oil Field, and may be subdivided into five sedimentary microfacies, including the subaqueous distributary channel, channel-mouth bar, interdistributary bay, overbank and sand sheet microfacies. During the deposition of the lower submember of the third member of the Shahejie Formation in the Wei-2 block, Weicheng Oil Field, frequent lake-level changes occurred in the Dongpu depression. Vertically, the sandstones display the incomplete delta sequences and the couplets of shallow-water sandstones and deep-water mudstones, and in a planar view, the alternation of progradation and retrogradation of the delta deposits. The results of research in this study may assist in the future development of the Weicheng Oil Field.关键词
卫城油田/沉积相/演化规律/湖平面变化Key words
Weicheng Oil Field/sedimentary facies/evolution/lake-level change分类
天文与地球科学
