Salt structures in the Laizhouwan depression, offshore Bohai Bay basin, eastern China: New insights from 3D seismic data |
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| Authors: | Yixin Yu Xinhuai Zhou Liangjie Tang Wenxu Peng Dingyou Lu Weiguo Li |
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| Institution: | aState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;bBasin & Reservoir Research Center, China University of Petroleum, Fuxue Road No.18, Changping, Beijing 102249, China;cTianjin Branch, CNOOC Limited, Tianjin 300452, China;dDepartment of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77204, USA |
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| Abstract: | Using the new high-quality 3D seismic data, this paper addresses the salt structures in the KL11 area of the Laizhouwan depression in the southern offshore Bohai Bay basin. In the study area, the salt in the Sha-4 Member of the Paleogene Shahejie Formation thickened, and then formed an S–N trending salt wall, which changes shape regularly along its trend from salt diapir to salt pillow. The change in thickness of the suprasalt layers record five growth phases of the salt wall from the Eocene to the Quaternary: (1) early diapirism, (2) active diapirism, (3) passive diapirism, (4) relative structural quiescence, and (5) arching. The evolution of the salt structures was mostly governed by the multi-phase compression induced by the dextral strike-slip of the Tan–Lu fault, which formed a restraining bend in the study area. There was an original passive stock in the south, which was later tectonically squeezed by E–W compression and became a diapir. As the shortening propagated to the north from the original stock, the salt pillow was created in the north. Relative structural quiescence then followed until the next phase of compression, which arched the thick roof of the salt wall. |
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| Keywords: | Salt structures Salt diapir Salt pillow Compression Tan– Lu fault Laizhouwan depression Offshore Bohai Bay basin |
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