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Study on the Dawsonite Sandstones Reformation with CO_2 Fluid

QU Xi-yu,LIU Li,HU Da-qian,MA Rui,YOU LiCollege of Earth Sciences,Jilin University,Changchun 130061,China  
Based on the study on the reformation of Dawsonite sandstones with CO2 fluids at different temperature(100℃,200℃ and 300℃) and different the CO2/H2O/sandstone systems in inclosed containers,it is suggested that the corrosion intensity of dawsonite sandstone will gradually be enhanced as the temperature increases.At the same time,the SEM study shows that gibbsite occurs on the sample surface.At 200 ℃,as dawsonite sandstone is being dissolved authigenic siderite forms.At 300℃,chlorite deposit on parts of the sample surface.The weak solution of dawsonite sandstone at 100℃ and the formation of siderite at 200℃ illuminate that CO2 being in carbonates in the strata can not be released when CO2 phase is adding to the system.
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