Subsalt Structural Deformation Models in the Kuqa Foreland Thrust Belt

doi:10.7657/XJPG20250405

Abstract

Abstract:

The structural modeling of the Kuqa foreland thrust belt has undergone three periods of theoretical transformations. The subsalt Mesozoic Triassic-Jurassic detachment structures have not been profoundly studied, and there are still considerable controversies regarding the structural deformation models and mechanisms of multi-detachment layers. Considering the presence of multi-detachment layers in the ultra-deep complex structural belts in the Kuqa foreland thrust belt, the structural deformation system of layered detachment in the Kuqa foreland thrust belt was investigated from the perspectives of geometry, kinematics and dynamics. Combined with the high-precision 3D seismic data, the subsalt structural deformation patterns were analyzed, and the structural models of the deep subsalt multi-detachment layers were depicted. The influences of geological factors such as paleo-uplifts, pre-existing faults, and evaporite rocks on the deep subsalt structures were discussed. The results show that the subsalt structural deformation in the Kuqa foreland thrust belt is mainly associated with five sets of regional detachment layers, exhibiting the features of multi-detachment layers in stacked distribution, vertically stratified detachment deformation, and spatially differentiated superposition deformation. Spatially, from the southwest to the northeast, the structures transform from the basement-involved thrust to the cap rock sliding, together with a ramp-flat multi-detachment-layer superimposed transition zone, generally presenting a trend of three-segment progressive deformation. Orderly and large-scale pop-up structures are developed at the ramp-flat fault transition joints. The subsalt Mesozoic has the possibility of developing secondary anticline traps in rows and bands, making it promising for oil and gas exploration.

Key words: Tarim Basin, Kuqa foreland thrust belt, subsalt structure, multi-detachment layer, structural deformation, ramp-flat

CLC Number:

TE121

MEI Yongxu, ZHANG Jinning, PAN Yangyong, LIU Peiye, XIANG Honghan, NENG Yuan. Subsalt Structural Deformation Models in the Kuqa Foreland Thrust Belt[J]. Xinjiang Petroleum Geology, 2025, 46(4): 429-437.

Figures/Tables 9

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