Constraints the Depth and Geometry of the Subsurface Detachment Fault from Parameters of Propagation Anticline: Geometrical Model and It’s Applied to Thin-skinned Thrust in Chongqing Area, South China

Abstract

Abstract:

A geometrical model, which utilizes an assemblage of parameters of propagation anticline to constraint the depth and geometry of the blind detachment fault,is figured in this paper based on both balanced geosection principles and previous studies. The parameters measured from anticline in this model include backlimb angle, interlimb angle, the height of anticline, the width of the anticline and the thickness of the layer upwards point fault tip. The calculation could be practiced using software ZB1.0, which was programmed in VC⁺⁺, and gives results of the detachment fault, including ramp dip angle, fault-parallel distance, strata draught and the deepth of flat. Parameters of anticline, which are from seismic and geological sections of the Cizhuya propagation anticline, respectively, give the consistent depth and dip angle of detachment fault at 8.10-8.63 km and 29°-45°. The depth indicates the detachment fault along the bottom of Cambrian, while the dip angle suggests a medium dip for the fault ramp. The results are also consistent with the regional geological estimation, and thus proved that the geometrical model is practicable to petroleum exploration and subsurface structures in this area.

Key words: thin-skinned structure, propagation fold, geometrical model, detachment fault, quantitative constraint

CLC Number:

P542

ZHANG Bing Ya-Dan-Beng Song-Hong-Lin Zhang-Wei-Chen Xu-Ping Wei-Guo-Qiang JIN Zhe-Long. Constraints the Depth and Geometry of the Subsurface Detachment Fault from Parameters of Propagation Anticline: Geometrical Model and It’s Applied to Thin-skinned Thrust in Chongqing Area, South China[J]. Geoscience, 2008, 22(5): 779-786.

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