APPLICATION OF THE SUPERCRITICAL FLUID EXTRACTION TECHNIQUE IN GEOCHEMICAL PROSPECTING FOR OIL AND GAS
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摘要: 超临界流体的密度是气体的100~1 000倍,粘度比液体低10~100倍,扩散系数比液体高10~100倍,易于穿透介质,可以选择性分离,特别是基本消除了有机溶剂对人体和环境的危害。一般超临界萃取过程仅需10~60 min。选择某油田已知含油气区进行试验研究,结果表明,萃取出的烃类物质保真性好,可以与化探样品分析的其它指标进行对比,为油气化探提供可靠资料。Abstract: The densities of supercritical fluids are 100 to 1 000 times as much as the densities of gases.Their viscosities are 10 to 100 times less than that of liquids.And their coefficients of diffusion are 10 to 100 larger than that of liquids.A supercritical fluid is easy to penetrate the media and can achieve selective separation on hydrocarbons.Moreover,supercritical fluid extraction can basically remove the harm of organic solvents to human and environment.Generally,the process of supercritical fluid extraction only take 10 to 60 minutes.An existing oil and gas area in a oil field was selected where research on supercritical fluid extraction was made.The result shows that fidelity of the extracted hydrocarbons is high.The comparison between supercritical fluid extraction and the other indicators in petroleum geochemical exploration is possible.Supercritical fluid extraction can supply oil and gas geochemical exploration with reliable information.
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