Formation Mechanism of Condensate Gas Reservoir in Yaha Area in Slope Belt of Kuqa Foreland Basin

Abstract

Abstract: The reservoirs discovered in the slope belts of foreland basin in central?western China are mostly condensate gas reservoirs, but their hydrocarbon accumulation mechanisms are still unclear. Taking the Yaha area in Kuqa foreland basin as an example, the formation mechanism of condensate gas reservoir on this slope belt is analyzed. It is suggested that Yaha area is characterized by typical condensate oil and gas: high gas?oil ratio on the whole; low density, low viscosity and high wax for the condensate oil; wet gas for the condensate gas.Through measures of homogenization temperature of the brine inclusions associated with hydrocarbons, combined with burial history and geothermal history, it is determined that Yaha area has two periods of hydrocarbon accumulations: 8×106~5×106 a for crude oil charging and 5×106a for natural gas charging, particularly for 3×106a for natural gas charging. Hence, the formation process of Yaha condensate gas reservoir has been recovered, combined with the tectonic evolution history of Kuqa foreland basin, and the formation mechanism of“oil charging first and then gas invasion” for the secondary condensate gas reservoir in the slope belt of Kuqa foreland basin is proposed

CLC Number:

TE112.41

LUO Xiao1, JIANG Zhenxue1a,1b, LI Zhuo1a,1b, LIU Jianliang2, GAO Tian1a,1b, CHEN Lei1a,1b, FENG Jie1a,1b. Formation Mechanism of Condensate Gas Reservoir in Yaha Area in Slope Belt of Kuqa Foreland Basin[J]. , 2014, 35(6): 1-1.

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Formation Mechanism of Condensate Gas Reservoir in Yaha Area in Slope Belt of Kuqa Foreland Basin

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