A New Paleobathymetric Approach Based on Shoreline Trajectory: An Example from Dongying Delta in the Third Member of Paleogene Shahejie Formation
详细信息
- 责任者：Kang Bo (Key Laboratory of Tectonics and Petroleum Resources ; Ministry of Education ; China University of Geosciences ; Wuhan 430074 ; China) ; Xie Xinong
- 刊名：Acta Sedimentologica Sinica
- 出版年：2012
- 卷期：30(3)
- 关键词：古水文学 ; paleohydrology ; 三角洲 ; deltas ; 沉积岩 ; sedimentary rocks ; 东营凹陷 ; Dongying Sag
- 页码：p.443-450
- 图表：3 illus., 20 refs.
- 分类号：0803
- issnNo：ISSN1000-0550
- isbnNo：CN62-1038/P
摘要
It is difficult to estimate paleobathymetry in sedimentary study. The modes of "indicatorpaleowater depth" have been used as qualitative or semiquantitative methods, but with challenges from hard samples requirement and low predicting precision. A new geometric approachshoreline trajectory for quantitatively paleobathymetric analysis was proposed based on the study of Dongying delta, middle part of third member of Paleogene Shahejie Formation (Es32) in the Donying Depression. Shoreline trajectory is used to obtain the variation principle of accommodation and sediment supply under a point sediment supply. Backstripping and forwarding methods are combined to acquire the initial sediment thickness and the increment of accommodation in the top layer of each unit, respectively. The water depth in undercompensation areas in deltaic front facies can be expressed as the value of sediment thickness subtracted by accommodation. Both differential tectonic subsidence and sediment supply tendency are considered in this method, making it an accurate approach to predict waterdepth variation in deltaic areas. The method is successfully applied in Dongying deltaic areas of Es32 where nine sets of progradation are developed, showing that the deepest water occurs in t3 with the maximum water depth up to 180 m. The method reveals the variation of water depth in deltaic area in detail, providing an effective way for quantitatively predicting the Spatial distribution of sediment.
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