Restoration methods of sedimentary palaeogeomorphology and applications: a case study of the First Member of Paleogene Shahejie Formation in Raoyang sag
YE Lei1, ZHU Xiaomin1, XIE Shuanghui1, YANG Ke1, ZHANG Meizhou1, QIN Yi2
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 2 School of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an 710065,China
Abstract The restoration of sedimentary palaeogeomorphology,an important aspect of source-sink system analysis,is helpful for the reconstruction of the sediment transport path system. It is crucial to study the distribution and evolution of ancient drainage systems, sedimentary systems and reservoir development in sedimentary basins. This paper summarizes the common methods and research progress of palaeogeomorphology restoration. The residual thickness method,impression method,back stripping and filling method,sedimentology method,sequence stratigraphy method,and geophysics method, etc., are the common methods used to restore sedimentary palaeogeomorphology. In the process of palaeogeomorphology restoration,the factors such as tectonic subsidence differences,compaction,stratum erosion and palaeowater depth should be considered to restore the original sedimentary thickness and quantitatively restore the sedimentary palaeogeomorphology. In the future,the study of palaeogeomorphology will gradually develop in the direction of multidisciplinary theory intersection,multi-method comprehensive analysis and multi-data application verification. The Lixian slope in the Raoyang sag was NNE-trending,west-uplifting and east-dipping,and south-gentle and north-steep before the deposition of the First Member of the Paleogene Shahejie Formation. From west to east,it is devided into the uplift area,slope area and trough area. The distribution of sand bodies was obviously controlled by the geomorphology. The slope area was controlled by two slope breaks,and the sandy sediments were more easily developed in the gentle slope zone. The multiple sets of NE-trending normal faults in the trough area led to the semi-graben geomorphology,which limits the development and distribution of sand bodies. It is easier to accumulate sandy sediments in the lower terrain and near the faults. These sand bodies that are continuously distributed in the plane can be regarded as potentially favorable reservoirs.
Fund:National Natural Science Foundation of China(No.42272110)
Corresponding Authors:
ZHU Xiaomin,born in 1960,is a professor and doctoral supervisor of College of Geosciences,China University of Petroleum(Beijing). He is mainly engaged in teaching and researches on sedimentary geology and sequence stratigraphy. E-mail: xmzhu@cup.edu.cn.
About author: YE Lei,born in 1995,is a Ph.D. candidate of the College of Geosciences,China University of Petroleum(Beijing). She is mainly engaged in research on sedimentology. E-mail: yeleilydia@163.com.
Cite this article:
YE Lei,ZHU Xiaomin,XIE Shuanghui et al. Restoration methods of sedimentary palaeogeomorphology and applications: a case study of the First Member of Paleogene Shahejie Formation in Raoyang sag[J]. JOPC, 2023, 25(5): 1139-1155.
YE Lei,ZHU Xiaomin,XIE Shuanghui et al. Restoration methods of sedimentary palaeogeomorphology and applications: a case study of the First Member of Paleogene Shahejie Formation in Raoyang sag[J]. JOPC, 2023, 25(5): 1139-1155.
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