Deformation characteristics and analog modeling of transtensional structures in the Dongying Sag, Bohai Bay Basin

doi:10.1007/s11707-022-1062-6

Front. Earth Sci.

2024, Vol. 18

Issue (1) : 227-241 https://doi.org/10.1007/s11707-022-1062-6

Deformation characteristics and analog modeling of transtensional structures in the Dongying Sag, Bohai Bay Basin

Dawei DONG¹, Li ZHAO²(

), Weizhong ZHANG³, Jiyan LI⁴, Ruixiang ZHANG¹, Jianlei YANG¹, Guangzeng WANG⁵

¹. Shandong Institute of Petroleum and Chemical Technology, Dongying 257061, China
². College of Resources and Environment, Shandong Agriculture University, Tai᾽an 271018, China
³. Geophysical Research Institute of Shengli Oilfield Branch Company, SINOPEC, Dongying 257022, China
⁴. Research Institute of Petroleum Exploration & Development, Shengli Oilfield Company, SINOPEC, Dongying 257000, China
⁵. College of Marine Geosciences, Ocean University of China, Qingdao 266100, China

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Abstract

Hydrocarbon exploration in the Dongying Sag is constrained by the development of many Cenozoic transtensional structures with complex patterns and dynamic mechanisms. This study uses seismic interpretation and analog modeling to investigate these transtensional structures. Significant results include dividing these transtensional structures into boundary fault, oblique rifting, and deep strike-slip fault controlled structures, according to the relationships between main and secondary faults. They developed in the steep slope zone, the central sag zone, and the slope zone, respectively. In profile, the transtensional structures formed appear to be semi-flower-like, step-like, or negative-flower-like. In plan-view, they appear to be broom-like, soft-linked, or en-echelon structures. Further, these transtensional structures are controlled by the oblique normal slip of boundary faults, by the oblique extension of sub-sags, and by the later extension of deep strike-slip faults. The geometric deformation of these transtensional structures is controlled by the angles between the regional extension direction and the strike of boundary faults, deep faults, or sub-sags, where a larger angle corresponds to less developed transtensional structures. Further, the transtensional structures in the Dongying Sag were created by multi-phase and multi-directional extensions in the Cenozoic— which is also controlled by pre-existing structures. The strike of newborn secondary faults was determined by the regional extension direction and pre-existing structures.

Keywords transtensional structure seismic interpretation analogue modeling dynamic mechanism Dongying Sag

Corresponding Author(s): Li ZHAO

Online First Date: 27 December 2023 Issue Date: 15 July 2024

Cite this article:

Dawei DONG,Li ZHAO,Weizhong ZHANG, et al. Deformation characteristics and analog modeling of transtensional structures in the Dongying Sag, Bohai Bay Basin[J]. Front. Earth Sci., 2024, 18(1): 227-241.

URL:

https://academic.hep.com.cn/fesci/EN/10.1007/s11707-022-1062-6
https://academic.hep.com.cn/fesci/EN/Y2024/V18/I1/227

Fig.1 Planimetric distribution of transtensional structures in seismic reflection of T2 (a), the stratigraphic column (b) and the structural profile of the Dongying Sag (c). Fault abbreviations used are F1–Chennan, F2–Shicun, F3–Gaoqing–Pingnan, F4–Bamianhe, F5–Wangjiagang, F6–Shengbei.

Fig.2 Deformation characteristics of the Binnan–Lijin (a), Gaoqing–Pingnan (b), and Qingxi (c) transtensional structures. All faults appear in seismic reflection layer T6. Fault labels, seismic reflection interfaces, and location are the same as in Fig. 1.

Fig.3 Deformation characteristics of the Haoxian (a), He-7 (b) and Fan-148 (c) transtensional structures. All faults appear in the seismic reflection layer T6. Seismic reflection interfaces and location are the same as in Fig. 1.

Fig.4 Deformation characteristics of the Shicun (a), Wangjiagang (b) and Jinjia (c) transtensional structures. The faults are distributed in seismic reflection layers T6, T7, and T2. Seismic reflection interfaces and location are the same as in Fig. 1.

Tab.1 Experimental design of transtensional structures

Fig.5 Experimental models designed for boundary fault (a), oblique rifting (b), and deep strike-slip (c) controlled transtensional structures. Figure sub-parts are in plan-view and profile view (d) of the experimental models.

Fig.6 Experimental results and their interpretations for models M1 (a), M2 (b), M3 (c), M4 (d), M5 (e), M6 (f), M7 (g), M8 (h), M9 (i).

Fig.7 The tectonic settings of transtensional structures in the Jiyang Depression with an inset map showing the position of the Jiyang Depression within the Bohai Bay Basin, and the regional stress direction during the (a) Indosinian, (b) Late Jurassic – Early Cretaceous, (c) E_1-2k–E₂s₄ and (d) E₂s₃–E₃d tectonic periods. Fault abbreviations used are F7–Ningwu, F8–Chengnan, F9–Yinan, F10–Zizhen, F11–Luoxi, F12–Guxi, F13–Baiqiao, F14–Cicun, F15–Linyi, F16–Xiakou, F17–Kendong, F18–Gudong, F19–Changdi.

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