六盘水地区龙潭组煤储层微观孔隙结构特征分析

Microscopic pore structure characteristics analysis of coal reservoir at Longtan formation in Liupanshui area

通过野外地质露头、钻井岩心系统观测和采样,采用高压压汞实验等测试方法对六盘水地区龙潭组煤储层孔隙结构特征进行研究,并对孔隙进行分类。研究结果表明:六盘水地区龙潭组煤储层孔隙根据进退汞曲线不同可分为滞后环宽大型、滞后环紧闭型两大类;六盘水地区龙潭组煤储层孔隙孔径以0.1μm及以下的纳米级孔隙为主,且连通性较好。

Through the field outcrop,systematic observation and sampling of drilling core,and using testing methods such as high pressure mercury intrusion experiment,the pore structure characteristics analysis of coal reservoir at Longtan formation in Liupanshui area was done,the classification of pores was done as well.The results showed that:based on the mercury withdrawal curve shape,pore structure types at Longtan formation in Liupanshui area could be divided into two categories:wide and large hysteresis loop and closed hysteresis loop.The pore diameters of coal reservoir at Longtan formation in Liupanshui area are mainly the nanometer grade pores whose diameters are equal to or under 0.1 μm,meanwhile,the connectivity is good.