Types and Causes of Longitudinal Extensional Faulted Anticline

doi:10.19657/j.geoscience.1000-8527.2021.186

Abstract

Abstract:

Longitudinal extensional faulted anticline in extensional fault-bounded depression is an important oil and gas exploration field. According to faulted anticline geometry, these anticlines can be divided into double- faulted (a pair of normal faults) anticline, single-faulted anticline, and superimposed y-type faulted anticline. Based on Cenozoic geological data of the Bohai Bay Basin, origin of these three kinds of faulted anticlines is suggested as follow: (1) Double-faulted anticline is developed in rift valley stage, and is controlled by a pair of normal faults with face-to-face dipping mode. Its fault-bounded depression is mainly caused by local rock shortening during the early-stage regional extensional, differential subsidence and fault block tilting occurred in the late stage; (2) Single-faulted anticline is developed in the rift valley stage, and is controlled by single extensional fault-bounded depression. It is likely caused by the reverse traction, differential subsidence, and elastic flexure of rock formation during the descending process of the fault-bounded depression. Nonetheless local rock formation shortening is still a major factor; (3) Superimposed y-type faulted anticline is developed in post-rift stage and controlled by symmetric fault-bounded depression and the y-type faulted sag (i.e.fault-bounded sub-depression) among them. It is fundamentally different from the cause of strike-slip and extensional superimposed y-type faulted anticline, which does not actually belong to the longitudinal extensional faulted anticline category.

Key words: longitudinal extension faulted anticline, local rock formations shortening, extensional kinematics model, strike slip-extensional superimposed y-shaped faulted anticline

CLC Number:

TE121.2

CHEN Fajing, CHEN Zhaonian. Types and Causes of Longitudinal Extensional Faulted Anticline[J]. Geoscience, 2021, 35(06): 1789-1796.

Figures/Tables 10

Fig.1 Geological profile and location map of the southern Huanghua Depression

Fig.2 Sketch profile showing the formation of double-faulted anticline

Fig.3 TBB-85-NW444 seismic line profile and its location map

Fig.4 Seismic interpretation section of the Maxi reverse traction anticline

Fig.5 Sketch profile showing the formation of single-faulted anticline

Fig.6 Seismic profile of the Yellow River estuary depression, showing the superimposed y-type faults and anticlines among them

Fig.7 Sketch profile of the superimposed y-type faults and faulted anticlines among them in the western Bozhong sag

Fig.8 Sketch map showing pure shear and simple shear models of extension kinematics

Fig.9 Yannan strike slip-extensional superimposed y-type anticlines in the Liaohe Basin

Fig.10 Cross-section across the eastern margin of the Liaodongwan depression

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