北部湾盆地乌石凹陷东洼伸展滑脱构造发育演化模式及其油气地质意义

王征; 佟殿君; 高铭恒; 胡晨

doi:10.3799/dqkx.2022.154

Volume 47 Issue 7

Jul. 2022

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Wang Zheng, Tong Dianjun, Gao Mingheng, Hu Chen, 2022. Development of Extensional Decollement Faults and Its Petroleum Implications in Wushi East Subsag, Beibuwan Basin. Earth Science, 47(7): 2509-2520. doi: 10.3799/dqkx.2022.154

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Wang Zheng, Tong Dianjun, Gao Mingheng, Hu Chen, 2022. Development of Extensional Decollement Faults and Its Petroleum Implications in Wushi East Subsag, Beibuwan Basin. Earth Science, 47(7): 2509-2520. doi: 10.3799/dqkx.2022.154

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Development of Extensional Decollement Faults and Its Petroleum Implications in Wushi East Subsag, Beibuwan Basin

doi: 10.3799/dqkx.2022.154

Wang Zheng^{1, 2
,
,},
Tong Dianjun^{1, 2
,
,
,},
Gao Mingheng^{1, 2},
Hu Chen^{1, 2}

1.
College of Marine Science and Technology, China University of Geosciences, Wuhan 430074, China
2.
Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2022-04-09
Publish Date: 2022-07-25

Abstract

Abstract

From the Early Paleocene to the end of the Oligocene, Wushi Sag of the Beibuwan Basin experienced multiple phases of extension. A group of extensional decollement faults formed during the 2nd phase of rifting, but their formation mechanism and evolution process are not clear. Based on the new high-quality 3-D seismic data obtained in the process of petroleum exploration, an in-depth analysis of the extensional decollement faults in the Wushi East subsag is conducted in this study. The results show that there are 7 extensional decollement faults (Fa‒Fg) in the Wushi East subsag, which are distributed in the near E-W or NE-SW direction. These decollement faults, together with north-dipping No.7 boundary fault, controlled sedimentation from the 1st Member of Liushagang Formation to the 1st Member of Weizhou Formation, which formed a huge rollover anticline. In terms of evolution, during the Early-Middle Eocene, the basin was a graben or half-graben controlled by the NE-SW No.7 boundary fault and other local small basement faults. The 3rd Member of Liushagang Formation strata was discretely distributed and was overlain by thick layer oil shale of the 2nd Member of Liushagang Formation. From the Late Eocene to the Late Oligocene, 1st Member of Liushagang Formation to the 1st Member of Weizhou Formation deposited in the basin, which was controlled by the oppositely dipping extensional decollement faults and the No.7 boundary fault. From the Early Miocene to the present, the basin changed into a sag basin. This study has depicted the geometry of extensional decollement structure which formed during the second episodic rift phase of Wushi East subsag, analyzed the growth and linkage pattern of decollement faults, and proposed the decollement faults upslope-ward migration model, which has a great significance for solving the problems of oil and gas migration, storage and preservation.
- Beibuwan Basin,
- Wushi Sag,
- extensional decollement structure,
- structural evolution,
- oil and gas structure,
- marine geology

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References(47)

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Development of Extensional Decollement Faults and Its Petroleum Implications in Wushi East Subsag, Beibuwan Basin

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