Xinjiang Petroleum Geology ›› 2009, Vol. 30 ›› Issue (2): 201-204.

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Effect of Gypsum-Salt Rocks on Hydrocarbon Accumulation in Kelasu Structural Belt of Kuqa Depression

YANG Xian-zhang, LEI Gang-lin, ZHANG Guo-wei, ZHAO Dan-yang   

  1. Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China
  • Received:2008-07-29 Online:2009-04-01 Published:2020-08-25

Abstract: The study shows that the Paleogene gypsum-salt rocks of Kelasu structural belt in Kuqa depression has a significant effect on hydrocarbon accumulation in this area: 1)the regional distributing thick gypsum-salt rocks could provide premium conditions for subsalt trapping; 2)the petrophysical property of the rocks, such as low density, high thermal conductivity, poor insulation, strong plastic flow and effectively releasing lateral squeeze stress, is favorable for protection of the deep reservoir's porosity and permeability; 3)the strong plastic flow prevents from damages of tectonic compression to subsalt structural traps, and helps preservation of large traps and dependence of gypsum-salt zone on the traps. The result shows that in-depth study of the spatial distribution and petrophysical property is of great significance for further petroleum exploration in this area.

Key words: Tarim basin, Kuqa depression, Kelasu structural belt, gypsum-salt rock, cap rock, reservoir, structural trap

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