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      Recovery of the Erosion Thickness and Characterization of the Paleogeomorphology in the Southern Lishui Sag, East China Sea Shelf Basin

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          The restoration of the denudation thickness is the basis for quantitatively analyzing the basin burial history, thermal evolution history and hydrocarbon accumulation conditions. The well data is not sufficient to do this in the southern Lishui Sag with only 5 wells, so the new, high-quality three-dimensional (3D) seismic data is essential. The methods employed to determine the eroded thicknesses of key unconformities in the study area are the mudstone acoustic time difference (AC) method, vitrinite reflectance (Ro%) method and stratigraphic trend comparison method. On the basis of the structural evolution, the restoration of the paleogeomorphology is carried out. The results show that the Wenzhou formation (E2w) in the entire study area has been all denuded. The denudation thickness is in the range of 0 – 550 m, and decreases gradually from west, thicker than 200 m, to east. The erosion of the upper Lingfeng formation (E1l) are mainly occurred in the N-P-1 structural trap (N-P-1), the N-P-2 structural trap (N-P-2) and the N-P-3 structural trap (N-P-3). Among them, the eroded area in N-P-1 (near well S-1) and N-P-2 is 200 – 230 km 2, and the denudation thickness is 0 – 600 m, which increases from south to north, even up to 200 – 400 m in the region around well S-1. In N-P-3, the extent of denudation is 30 – 50 km 2, and the denudation thickness is 0 – 400 m. In the early stage of the upper E1l, one north-south strike slip fault began to develop in the southern study area. Affected by this fault, the southern Lingfeng bulge was offset, forming a gorge, and the eastern and western sides of the concave belt connected to each other. On the basis of the paleo-geomorphological characteristics, it is shown that the sedimentary center of the west subsag began to migrate to the south.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          24 January 2020
          01 April 2020
          : 19
          : 2
          : 320-330
          1Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
          2CNOOC China Ltd., Shanghai 200335, China
          3School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
          4College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
          5College of Geological Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
          Author notes
          *Corresponding author: ZHANG Jinliang, Tel: 0086-10-55800254, E-mail: jinliang@
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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