Early Paleogene strike‐slip transition of the Tan–Lu Fault Zone across the southeast Bohai Bay Basin: Constraints from fault characteristics in its adjacent basins

2018 ◽  
Vol 54 (2) ◽  
pp. 835-849 ◽  
Author(s):  
Guangzeng Wang ◽  
Sanzhong Li ◽  
Zhiping Wu ◽  
Yanhui Suo ◽  
Lingli Guo ◽  
...  
Keyword(s):  
Fault Zone ◽  
Strike Slip ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Slip Transition ◽  
Early Paleogene

scholarly journals Cenozoic tectonic model of the Bohai Bay Basin in China

2016 ◽  
Vol 153 (5-6) ◽  
pp. 866-886 ◽  
Author(s):  
FUSHENG YU ◽  
HEMIN KOYI
Keyword(s):  
Data Interpretation ◽  
Strike Slip ◽  
Normal Faults ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Basin Inversion ◽  
Tectonic Model ◽  
Early Oligocene ◽  
Anticlockwise Rotation ◽  
Partial Inversion

AbstractModelling results and seismic interpretation illustrate that the Cenozoic evolution of the Bohai Bay Basin (BBB) can be divided into different stages. A transtensional phase during Paleocene – early Oligocene time created NE-trending strike-slip faults and E–W-trending normal faults which were driven roughly by N–S–extension, making an angle of 25° with the strike-slip faults. Seismic data interpretation yields evidence that inversion phases occurred within the NE Xialiaohe Depression of the greater Bohai Bay Basin. This inversion phase is attributed to rotation and partial inversion that occurred during late Oligocene time, leading to formation of inversion structures along the NE part of Tanlu Fault. This episode is attributed to an anticlockwise rotation of the eastern part of the BBB driven by the convergence between the Pacific and Eurasian plates. The tectonic scenario described was simulated in scaled analogue models, which were extended by pulling two basement plates away from each other. Partial inversion was simulated by rotation of one of the plates relative to the other. Model results show many of the features observed in the BBB. Our model results are used to argue that, unlike the two-episode extension and whole-basin inversion models previously proposed for the BBB, a single N–S-aligned extension followed by anticlockwise rotation accounts for the Cenozoic evolution of the BBB and produces some of the structural complexities observed in the basin.

scholarly journals Structures and Kinematics of the Huanghua Depression in Bohai Bay Basin, East China: Implications for the Formation Mechanism of a Transtensional Basin

Lithosphere ◽  
2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Liguang Mao ◽  
Xianzheng Zhao ◽  
Shixun Zhang ◽  
Yumeng Su ◽  
Fengming Jin ◽  
...  
Keyword(s):  
Middle Eocene ◽  
Strike Slip ◽  
Bohai Bay ◽  
Rift Basin ◽  
Strain Partitioning ◽  
Lateral Shear ◽  
Bohai Bay Basin ◽  
Drilling Data ◽  
Huanghua Depression ◽  
Fault Structures

Abstract The Bohai Bay Basin in East Asia is a rift basin created by Cenozoic subduction of the oceanic Pacific plate beneath the Asia continent. Many prior studies suggest that the basin was initially formed in the Paleocene with the development of several NNE-trending extensional grabens, but subsequently impacted by right-lateral shear along these existing NNE-trending structures in the middle Eocene, transforming the Bohai Bay Basin into a transtensional basin and producing EW-trending grabens in the Bozhong and the northeastern Huanghua depressions. However, how this transformation occurred remains to be fully understood. Based on seismic and drilling data, we herein investigated the fault structures, basin architecture, and evolutionary stages of the Huanghua Depression in the central-west Bohai Bay Basin to examine the strain partitioning and evolution mechanism during the Paleogene syn-rifting stage. The results reveal that the Huanghua Depression is composed of three structurally distinctive zones, namely, a dextral transtensional, a NW-SE extensional, and a N-S extensional zones from southwest to northeast, which are separated from each other by two transfer zones. The NW-SE extensional zone is interpreted as a horsetail structure on the northern termination of the dextral transtensional zone. This dextral transtensional zone and the Tan-Lu Fault zone to the east served as strike-slip boundaries within which EW-trending depressions such as the northeastern Huanghua and Bozhong depressions formed in the middle Eocene.

Buried Strike-Slip Fault Identification Technique Based on a 3D Stress Body Attribute Considering Formation Deformation and Lithologic Variation

2021 ◽  
Author(s):  
Wei Wang ◽  
Kui Wu ◽  
Lin Kang ◽  
Xiaobo Huang ◽  
Jian Yao
Keyword(s):  
Stress Field ◽  
Plate Theory ◽  
Critical Role ◽  
Sudden Change ◽  
Strike Slip ◽  
The Body ◽  
Strike Slip Fault ◽  
Wave Number ◽  
Bohai Bay ◽  
Bohai Bay Basin

Abstract The identification and interpretation of buried strike-slip faults are of great significance int the search for structural traps in oil and gas exploration. However, it is difficult to identify and interpret buried strike-slip faults from seismic profiles and variance slicing, because they may be clear at depth but vague in the shallow. This study proposes a 3D stress body attribute taking into consideration formation deformation and lithologic variation to identify buried strike-slip faults. Taking into account thin plate theory and the generalized Hooke's law, a relationship between stress field, formation deformation and lithologic variation is established. Structural curvature body is used to represent the formation deformation, which is obtained by scanning of the body dip angle and second-order derivation of the wave number domain, while Poisson's ratio and Young's modulus volumes are employed to reflect the spatial lithologic variation, which are calculated by the multivariate linear fitting method or prestack inversion. This technique is applied to the secondary structural interpretation of JinZhou 25-1 oilfield in LiaoDong Bay depression of BoHai Bay Basin. Compared with the 2000 ms variance slice, it can be seen clearly that there is a significant stress concentration zone in the location of LiaoXi buried strike-slip fault from the 3D stress body attribute slice, which is consistent with a sudden change in strata observed on the profile. The LiaoXi buried strike-slip fault has been identified and interpreted. Many structural traps greater than 20km2 have been found along its course. Among them, W structure was drilled in 2016 and about 4.5 million tons of oil was found. This suggests that the spatial distribution of buried strike-slip faults associated with tectonics can be effectively identified through the strength property of the stress field, which is greatly superior to the conventional variance-related methods. It verifies the ability of this technique in the identification and interpretation of strike-slip faults in the entire Bohai Bay Basin and thus its potentially critical role in guiding secondary seismic interpretation.

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