激光扫描共聚焦显微镜研究储层孔隙结构

Application of Laser Scanning Confocal Microscope to the Measurement of Pore Texture in Reservoirs

这是一项首次应用激光扫描共聚焦显微镜 (LSCM)的激光荧光技术于油气储层的孔隙结构研究。供LSCM用的样品 ,用环氧树脂加入荧光剂后 ,经加压灌注 ,磨制成岩石薄片 ,在LSCM显微镜下观察孔喉的分布 ,可以测量面孔率 ,并可标出需要测量的每个孔喉的大小以及观察孔喉形状及分布状况。该法的优点 :1.可直接测量和观察到 2 μm左右大小的孔喉。 2 .在LSCM显微镜下可区分孔隙空间中的充填粘土杂基等 ,因此面孔率的测定较一般镜下统计和图像分析更为精确 ,因粘土矿物由于吸附染色剂后在颜色或灰度上有的不易区分。 3.岩石薄片中的微裂缝 ,在LSCM显微镜下可以更清楚地观察到。

Samples are pressure-impregnated with epoxy mixed with a fluorescent dye. So the Laser-induced fluorescence can be observed in thin section with LSCM (Laser scanning confocal microscope ). This technique provides a rapid method for directly obtaining measurement of visual porosity and the size of pores and throats from thin section. The advantages of this method are as follows: 1. The pore size larger than 2μm can be observed 2. The clay matrix in pore space can be differentiated with LSCM but it could not be distinquished with polarized microscope or image analysis during the clay minerals are absorbed with rose fluorescent dyes, so the measmement of visual porosity with LSCM would be more accurate 3. Some fissures in thin section can clearly be observed