Key Concept and Characteristics of Deep Basin Gas Accumulation
Received date: 2009-04-29
Revised date: 2009-07-01
Online published: 2009-10-10
The essence of deep basin gas accumulation is gas saturated feature in the basin center, which may present several hundred meters of gas in a well bore without water, and generally include coal bed absorbed gas, shale fracture gas, and sandstone void gas. Basin centered gas accumulation could easily happen in a basin with plenty of coal formation, moderate burial depth, tectonic constancy, and a mega temperature evolution history. Most of deep basin gas accumulations are sealed by tight reservoir water in updip direction and involve everlasting gas supply, but this is only one of deep basin gas styles. Mutual dissolution of water vapor and methane in the ancient HTHP situation and the formation of bound water in reservoir bed compaction lithogenesis led to the absence of water layers in deep basin gas accumulation.“Acid dew” which has lower salinity than formation water will present along with mutual dissolution vapor condensation during the cooling and shrinking stage of deep basin gas accumulation. Deep basin gas accumulation may have the subpressure or surpressure characteristics in different evolutionary phases. Deep basin gas accumulations are available in Songliao basin, Qinshui basin and other coal basins in Northwest China.
Key words： Deep basin gas; Tight sandstone; Lithologic trap; Hydroseal trap; Surpressure; Subpressure.
XU Hua-zheng,GAO Li,WANG Chuan-gang,LI Song,YIN Wei, LIU Chun-yan . Key Concept and Characteristics of Deep Basin Gas Accumulation[J]. Natural Gas Geoscience, 2009 , 20(5) : 781 -789 . DOI: 10.11764/j.issn.1672-1926.2009.05.781
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