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

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

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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 struc-tures 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.

transtensional structureseismic interpreta-tionanalogue modelingdynamic mechanismDongying Sag

Dawei DONG、Li ZHAO、Weizhong ZHANG、Jiyan LI、Ruixiang ZHANG、Jianlei YANG、Guangzeng WANG

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Shandong Institute of Petroleum and Chemical Technology,Dongying 257061,China

College of Resources and Environment,Shandong Agriculture University,Tai'an 271018,China

Geophysical Research Institute of Shengli Oilfield Branch Company,SINOPEC,Dongying 257022,China

Research Institute of Petroleum Exploration & Development,Shengli Oilfield Company,SINOPEC,Dongying 257000,China

College of Marine Geosciences,Ocean University of China,Qingdao 266100,China

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Shengli Oil Company Ltd.,Sinopec.Natural Science Foundation Project of Shandong Provincehe National Natural Science Foundation of Chinahe National Natural Science Foundation of China

ZR2020MD0364207216242072235

2024

地球科学前沿
高等教育出版社

地球科学前沿

CSTPCD
影响因子:0.585
ISSN:2095-0195
年,卷(期):2024.18(1)