Physical modeling analysis on salt structure deformation with interbeded layers in Kuqa Depression
ZHANG Xichen;LUO Liang;YANG Keji;YU Xiaoxia;XIE Rongbo;LUO Lingyan;State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum;Department of Geology,China University of Petroleum;
Latest drilling and logging data indicate the Paleogene Kumugeliemu Formation is not pure salt in Kuqa Depression, it is composed of 4 interlayers. Based on stratigraphy assemblage, the interbeded ductile layer model is devised to physically simulate the evolution of four different interlayers. This model reveal differential deformation in 4 interlayers, interaction between the ductile layer and the strata beneath and above salt, and deformation mechanism of competent interlayer. Test results show that the bottom ductile layer was pierced by faults from sub-salt strata, absorbing a large number of thrust displacements. This layer also pierced overlying sand interlayer into top ductile layer. The sand interlayer was subjected to shear action of the surrounding ductile layers,and the dense minor folds were developed. Its intensive thickening usually occur in the footwall of the sub-salt faults with complex folds, which was controlled by violent thrust action from sub-salt strata. The top ductile layer is a significant decollement with the intense flow, expanding the range of deformation and promotes folds in the upper-salt strata. The top micro glass bead layer bent and flowed in the core of anticline. Interbeded layers is an necessary prerequisite for the study of salt structures in Kuqa Depression.
【CateGory Index】： P618.13