矿物润湿性对储层烃类包裹体形成制约的实验研究

储层矿物润湿性制约了流体的微观流动特性,从而影响流体在储层的微观分布特征.油和水在矿物表面的润湿性差异导致油气充注过程中形成不同特征的流体包裹体类型.矿物表面实验分析表明,对于水和原油而言,石英具有较明显的亲水性,而方解石的亲水性和亲油性差别不大.轻质油(汽油)在矿物表面完全铺展,储层矿物具有明显的亲油性.通过在不同油...

Experimental study on wettability of minerals constrains on hydrocarbon-bearing inclusions forming in reservoir

The wettability of minerals constrains the characteristics of micro-flow and distribution of fluids in reservoirs. The difference of wettability between oil and water lead to different types fluid inclusions formed in reservoirs. Experimental analysis of mineral surfaces show that quartz is distinct oleophilic, but the wettability of calcite is no obvious difference between water and crude oil. Gasoline extend completely on quartz and calcite, it means that all minerals are oleophilic for light oil. Experiments of synthetic hydrocarbon-bearing inclusions and analysis of fluid inclusions from natural reservoir indicate that wettability have great effect on forming of fluid inclusions and in reservoir. Results of experiments proved that it have significantly effect on mineral crystal growth, diagenesis be suppressed, and the number of hydrocarbon-bearing inclusions decrease during accumulation of light oil. However, it does not remarkable effect on diagensis and forming of inclusions during emplacing of heavy oil. Overall, oils restrain quartz much more than calcite during accumulation of oil and gas because quartz is more oleophilic than calcite. So, it is always more hydrocarbon-bearing inclusions in calcite than quartz in same reservoir.