储油岩芯二相液体吸附特性的NMR研究及应用

为研究储油岩芯对液体的吸附机理,我们特地用同一岩芯制成以下几种样品:(1)吸附不同量的煤油;(2)吸附不同量的水;(3)先吸附一定量的水再吸附一定量的煤油.对以上三组样品,做了NMR自旋—晶格弛豫时间测定;考查了岩芯样品中各弛豫成分量与液体吸附量的变化规律;得出了岩芯内水和煤油受束缚越紧其弛豫时间越短的结论.并依据大量石油地质学的结论建立了砂岩孔隙中油水二相系统的核磁共振模型.

THE STUDY OF ADSORPTION CHARACTERISTICS OF TWO PHASE LIQUID IN OIL RESERVIOR CORE BY NMR AND APPLICATION

In order to study the absorption mechanism of liquids in oil reservior core, several samples were prepared using the same rock core: 1)different quantities of kerosene adsorbed; 2)different quantities of water adsorbed; 3)some quantity of waker was adsorbed first and then some quantity of kerosene was adsorbed later. The NMR spin lattice relaxation times were determined for the above three groups of samples; The conclusion is that the closer the water and oil molecules to the solid surface the shorter the relaxation time is. According to the conclusions on petroleum geology and NMR study results a NMR model of two phase (oil/water) system in porous sandstone was proposed.