Structure and Evolution Analyses of the Liaobei Area of Bohai Bay Basin

doi:10.19657/j.geoscience.1000-8527.2020.06.082

Abstract

Abstract:

Based on fine interpretations of 3D seismic data and drill-hole data from northern Liaoning, the structural characteristics and fracture system of the basin are characterized in detail, and integrated with the regional geodynamic framework of the northern Liaodong Bay (northern part of the Liaoxi, Yuanyanggou, and central depressions). Cenozoic tectonic evolution process of the southern tip of the bulge and the northern tip of the Liaoxi bulge was analyzed in detail. The results show that: (1) Changes in the occurrence and activity of the major controlling basinal faults make the basinal structure in northern Liaoning different from south to north along the depression axis: the northern part is characterized by the southeast fault (sag). The simple half-graben fault features are controlled by the Liaoxi No.2 and No.3 faults in the middle, and two half-grabens are developed to form a domino-type half-graben system. The southern Liaoning large fault cuts the western boundary of the basin, as manifested by an asymmetric complex graben structure. (2) Paleocene-Eocene fault system has mainly NE-trending normal faults, which controls the basin basement structure. In the Oligocene, the NNE-trending strike-slip faults and their secondary faults dominate, and the main strike-slip fault zone has developed a typical trans-tensional/-pressive transition structure. The Neogene fault system is characterized by a series of secondary fault combinations with an NNE en echelon pattern. (3) Cenozoic northern Liaoning experienced three stages of tectonic evolution, i.e.Paleocene-Miocene strong extension and weak strike-slip stage, Oligocene strong extensional strike-slip stage, and Neogene strike-slip stage.

Key words: Bohai Bay Basin, Liaobei area, basin structure, fault structure, genetic mechanism

CLC Number:

TE121.2

ZHANG Jiangtao, GUO Tao, WANG Bingjie, LI Honglin, WANG Maozhen. Structure and Evolution Analyses of the Liaobei Area of Bohai Bay Basin[J]. Geoscience, 2020, 34(06): 1110-1118.

Figures/Tables 7

Fig.1 Geographic map of the Liaobei area

Fig.2 Interpreted seismic profile of the Liaobei area

Fig.3 Distribution of fault systems in the Liaobei area during different periods

Fig.4 Vertical displacement rate of the major faults in different periods

Fig.5 Extension rate of typical geological section in the Liaobei area

Fig.6 Diagram showing the structural evolution profile for ILN9700

Fig.7 Schematic Cenozoic tectonic evolution diagram for the Liaobei area

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