Characteristics of a Cambrian normal fault system in the Southern Ordos Basin and its formation mechanism

doi:10.13745/j.esf.sf.2022.8.11

Abstract

Abstract:

The Early Paleozoic deep structures of the Ordos Basin are not well studied due to the complex tectonic superposition and great difficulty accessing the deep strata. Based on seismic data interpretation and field geological survey, we found a Cambrian normal fault system in the southern Ordos Basin made of a set of NE and nearly EW faults. Here, we present a detailed description and analysis of the plane and profile characteristics of this fault system, and combined with regional geological background,discuss the genesis of the fault system. Our results indicate that this fault system is formed by the inherited activities of preexisting Proterozoic NE-trending basement faults in the Cambrian. Meanwhile, small-scale EW-trending newly-generated faults are formed in some segments of the fault system. The discovery of this fault system may be of significance for understanding the evolution of the southern Ordos Basin in the Cambrian as well as for the regional hydrocarbon exploration.

Key words: Ordos Basin, Cambrian, fault system, inherited

CLC Number:

P542
P534.41

XIONG Weidong, XIAO Ancheng, WEI Guoqi, WU Lei, ZHANG Chunlin, WANG Yiping, YANG Liuyun, WANG Qianqian. Characteristics of a Cambrian normal fault system in the Southern Ordos Basin and its formation mechanism[J]. Earth Science Frontiers, 2022, 29(6): 305-313.

Figures/Tables 9

Fig.1 Regional geological map of the southern Ordos Basin

Fig.2 Interpreted seismic section of Line A-A'

Fig.3 Interpreted seismic section of Line B-B'

Fig.4 Interpreted seismic section of Line D-D'

Fig.5 Interpreted seismic section of Line C-C'

Fig.6 Field characteristics of the Cambrian faults in the southern Ordos Basin

Fig.7 Distribution of the Cambrian fault system in the southern Ordos Basin

Fig.8 Sedimentary characteristics of the Cambrian in the southern Ordos Basin

Fig.9 Model of the Cambrian fault system in the southern Ordos Basin

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