Oil & Gas Geology ›› 2012, Vol. 33 ›› Issue (2): 208-216,235.doi: 10.11743/ogg20120207

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Effects of tectonic compression on hydrodynamic force in Kuqa Depression

Zhang Fengqi1,2, Wang Zhenliang2, Fan Changyu2, Zhao Xuejiao2   

  1. 1. School of Petroleum Resources, Xi’an Shiyou University, Xi’an, Shaanxi 710065, China;
    2. Department of Geology, Northwest University, Xi’an, Shaanxi 710069, China
  • Received:2011-05-15 Revised:2012-02-28 Online:2012-04-28 Published:2012-05-24

Abstract:

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.

Key words: tectonic compression, hydrodynamic force, tectonic stress field, Kuqa Depression, Tarim Basin

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