详细信息   

• 责任者：Yang Xiaofa (School of Energy Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Lin Changsong
• 刊名：Petroleum Geology & Oilfield Development in Daqing
• 出版年：2010
• 卷期：29(4)
• 关键词：沉积作用 ; sedimentation ; 地堑 ; grabens
• 页码：p.18-22
• 图表：4 illus., 10 refs.
• 分类号：0803
• issnNo：ISSN1000-3754
• isbnNo：CN23-1286/TQ

摘要

///Each episodic tectonic movement in tilted half graben basin is the changing process of boundary-control- ling faults from strong to weak. The space is varied with the different parts of the basin. It is difficult to find out the common stratigraphic sequence interfaces in all over the basin to construct isochronous stratigraphic framework. The quantitative analysis of the simplified model of geometric configuration and movement process of half-graben basin shows that after one episode of tilted turning movement, the subsidence center moves towards the gentle ramp belt, and the absolute water level of the basin is descendent. The strata previously below the water are exposed in both gentle ramp belt and steep ramp belt. There are two threshold points where accommodation space is constant from basin margin to basin bottom. In general, the basin accommodation space becomes smaller, but there is the tendency of increase toward the inner of the basin; the space between the two threshold points becomes larger in a whole, and moreover enlarges towards the subsidence center. In the half-graben Buoxing I~w, the above statements have been proven by the sequence characteristics controlled by 4 tilted structural activities in Sha No. 4 and No. 3 Members＇ sedimentary period. It possesses realistic significance to guide the establishment of isochronous framework of sedimentary stratigraphic sequences in tilted half-graben basin.