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Sedimentary characteristics and formation mechanisms of lacustrine beach-bars in the Fourth Member of the Shahejie Formation in the Shubei area, Western Depression of the Liaohe Oilfield, China

Yi Gao1, 2, Xiaolong Jiang3,Fang Liu4, Xuying Wang1, 2, Ruohan Liu1, 2
1. College of Energy, China University of Geosciences, Beijing 100083, China;2. Institute of Earth Sciences, China University of Geosciences, Beijing 100083, China;3. School of Earth and Mineral Sciences, The Pennsylvania State University, 201 Old Main,

Beach-bars are well developed in the fourth member of the Shahejie Formation in the Shubei area, Western Depression of the Liaohe oilfield. The fourth member is composed of two three-order sequences, including a lower Sequence 1 (SQ1) and an upper Sequence 2 (SQ2). SQ2, which is the focus of this study, comprises a lowstand systems tract (LST) and a transgressive systems tract (TST). Three types of beach-bars have been recognized: shallow-littoral lacustrine sandy beach-bars, semi-deep lacustrine storm-related sandy beach-bars and shallow-littoral lacustrine carbonate beach-bars. To analyze the formation mechanisms of the different types of beach-bars, the palaeo-environments during the deposition of SQ2 have been reconstructed, including the palaeo-geomorphology, palaeo-water depth and palaeo-source. The shallow-littoral lacustrine sandy beach-bars are formed mainly by waves and currents and are mostly deposited in the LST in the southwestern part of the study area, where water depths range from 3 to 9 m and the terrestrial clast supply is sufficient. The storm-related sandy beach-bars are developed in the southern part of the study area in the TST that is near the previously massively deposited sand bodies and has sufficient water depth to preserve them. The carbonate beach-bars are formed primarily in the Shubei low buried hill belt in the TST where there is a lack of terrestrial clast supply and complex, uneven geomorphology that can easily form a lagoon environment.

 

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Keywords:Beach-bars, Shubei area, Sedimentary characteristics, Formation mechanisms, Western Depression, Liaohe Oilfield

DOI:
10.1007/s12583-016-0928-0
CLC number:
U469.72
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