Structural Deformation Anatomy And Sandbox Simulation Experiment In Yinggehai Basin

The oil and gas reserves in the Yinggehai basin are very abundant.The current oil and gas exploration is mainly concentrated in the diapir tectonic area in the central part of the basin.The main control fault of the basin,the Honghe fault zone has experienced the transformation of the left rotation movement to the dextral movement.The academic circle has reached a consensus on this,but there are still many differences for the exact time of the movement.At the same time,there is no clear understanding of the formation time and mechanism of the diapir,and there are different views on the dynamic mechanism of basin formation.In this paper,the study method of structural analysis and equilibrium evolution has been adopted to find the"seesaw"variation in the stratum thickness of the Yingge basin,which can be used to find the exact time point of transition.This feature is the symbol of the change of the stress system in the basin,and it is also the result of the change of the regional movement mechanism.The left to right rotation time of the Red River fault zone is 2.4Ma.The five row diapir zone in the Yinggehai basin is formed under the dextral strike slip action of the Honghe fault zone.The fracture of the induced diapir activity belongs to the T tensile fracture,and the diapir activity is in the T₁₅^T₁₀,that is 1.4⁰.5Ma.With the guidance of the generalized fault model,the simulation experiment of the sand box in Yinggehai basin is designed and carried out.The regional tectonic characteristics of the whole Yingge Sea basin are reproduced well,and the two phase basin dynamic mechanism of the basin of Yingge Sea basin is verified by the superposition of the near North and South compression phase after the North-South extension of the Yingge basin.