基于高压压汞实验研究六盘水龙潭组煤储层孔隙分形特征

Fractal Features of Longtan Formation Coal Reservoir in Liupanshui on the Mercury Injection Method

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、煤岩鉴定等测试方法,对六盘水地区龙潭组煤储层孔隙分形特征进行了研究。结果表明,六盘水地区龙潭组煤储层以连通较好的板状开放孔为主。孔隙孔径以0.1μm及以下的纳米级孔隙为主,孔隙度略大,为3.42%。孔隙分形维数较大,表明其具有较高的不规则性。分形维数主要受镜质组反射率、煤岩显微组分、孔隙度、比表面积、比孔隙体积等参数的影响。

Through the field outcrop, systematic observation and sampling of drilling core, and using tes-ting methods such as high pressure mercury intrusion experiment, the pore fractal characteristics analysis of coal reservoir at Longtan formation in Liupanshui area was done. The results showed that： the pore di-ameters of coal reservoir are mainly the nanometer grade pores whose diameters are equal to or under 0. 1μm. The mean value of porosity is 3.42%. The fractal dimensions is large. This means the pores are itregular extremely. The influence factors are vitrinite reflectance, maceral composition, porosity, specific surface area, specific pore volume.