Late Himalayan tectonic compression was strong in Kuqa Depression

Tarim Basin

resulting in complex hydrodynamic force distribution.In order to understand the effects of tectonic compression on hydrodynamic force in Kuqa Depression

we simulated the distribution of the maximum principal compressive stress of Kuqa Depression in the Late Himalayan period.The tectonic compression model was used to evaluate the amplitude of tectonic overpressure in the main tectonic zones of Kuqa Depression in the Late Himalayan period.The evolution history of fluid pressure in the major target formations of Kuqa Depression was defined and that of gas pressure potential was restored by integrating the depositional overpressure with the tectonic compressive overpressure. Based on restoration of tectonic stress field and paleohydrodynamic force

we analyzed the effects of tectonic compression on hydrodynamic force and the characteristics of gas migration and accumulation in Kuqa Depression.Tectonic compression can change the hydrodynamic force in Kuqa Depression during strong tectonic activity.The enhancement of hydrodynamic force can increase gas migration force

being favorable for gas migration.The lowe-ring of hydrodynamic force can reduce gas migration force

being favorable for gas accumulation.Tectonic compression also can change the direction of hydrodynamic force

turning the local traps into relatively low potential areas

to which gas migrate.Areas with weak hydrodynamic force in the direction of stronger hydrodynamic force are favorable for hydrocarbon accumulation.