From reservoir,source to carrier beds exploration:a case study of tight sandstone gas in Xujiahe Formation,Sichuan Basin
There is enormous resources potential in the Xujiahe Formation of Sichuan Basin.Owing to the tight reservoir,the fault-fracture bodies have high and unstable hydrocarbon production,as well as limited reserves scale;the tight sandstone reservoirs have low production,and cannot achieve benefits and efficiency,although with large reserves.In order to solve the key problems that lim-it efficient exploration,i.e.,high production,stable production and reserves scale,the new prospecting idea for tight sandstone gas carrier beds has been formed by integrating the exploration ideas for conventional natural gas in reservoirs and shale gas from source rocks.Specifically,the paper establishes the accumulation model of"dual source hydrocarbon supply,transportation by fault-frac-ture bodies,composite hydrocarbon accumulation"for tight sandstone gas,and also clarifies the hydrocarbon enrichment and high production laws of"spatiotemporal superposition of structure-transportation for controlling reservoir enrichment,effective fracture controlling production in later period,composite combination of source rocks,low-permeability matrix reservoirs and carrier beds for controlling stable production".Guided by the accumulation models for tight sandstone gas carrier beds,as well as the hydrocarbon enrichment and high production laws of tight sandstone gas,15 wells deployed in the Hexingchang area of western Sichuan depres-sion achieved high yield,thus solving the problem of"rich resources without reserves,large reserves with low production,high pro-duction without gas fields"in Xujiahe Formation,Sichuan Basin.Additionally,the field with the proven reserves of 100 billion cubic meters was built in Hexingchang area,western Sichuan depression.On this basis,the efficient exploration and development of ultra-low permeability tight sandstone gas reservoirs in the Xujiahe Formation of western Sichuan depression has been achieved.These a-chievements have important guidance significance for the efficient exploration and development of tight sandstone gas reservoirs in Si-chuan Basin and similar sedimentary basins.
accumulation modelsenrichment and high production regularitiestight sandstone gas carrier bedTriassic Xujiahe For-mationwestern Sichuan depressionSichuan Basin
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