实验研究碳酸盐岩储层烃类包裹体不混溶捕获行为

认识储层烃类包裹体的捕获机制对于解释包裹体分析结果有着重要的意义.通过人工合成烃类包裹体实验,对碳酸盐岩储层烃类包裹体的不混溶捕获现象进行了探讨.通过对人工合成烃类包裹体的显微荧光、均一温度测试和拉曼光谱分析,对不混溶包裹体内捕获的物质进行了辨别.根据包裹体的相态特征和实验分析结果,可以将实验合成的不混溶包裹体归纳为两...

Experimental study on trapping behavior of hydrocarbon-bearing immiscible inclusions in carbonate reservoirs

An enhanced understanding of the trapping mechanism of hydrocarbon-bearing inclusions in reservoirs is helpful to explain the results of fluid inclusion analysis. The study discussed the immiscible trapping phenomena of the hydrocarbon-bearing inclusions in carbonate reservoirs by synthetic inclusion experiments. To identify the fluid components trapped in the immiscible inclusions, the synthetic hydrocarbon-bearing inclusions were analyzed by fluorescence microscope, homogenization temperature, and in situ low temperature Raman spectroscopic analysis. Based on their phase behaviors and compositions, the synthetic immiscible inclusions can be divided into two groups （water-hydrocarbon immiscible inclusions and hydrocarbon-hydrocarbon immiscible inclusions） and six subgroups （ i.e. hydrocarbon-hydrocarbon-water, hydrocarbon-water, hydrocarbon-hydrocarbon, gas-hydrocarbon, gas- hydrocarbon-water, and gas-hydrocarbon-hydrocarbon-water immiscible inclusions）. Comparison of the trapping behavior of different immiscible inclusions indicates that the mechanism of immiscible trapping is mainly related with fluid phase behavior, interface effect between fluids and minerals, oil cracking, and non-thermodynamic equilibrium. The experimental results also show that the micro-behavior of fluids may have a remarkable effect on the formation of fluid inclusions.