| Combined the equipments of microanalysis experiment as SEM,super-long focused microscope and polarizing microscope with the data from mercury injection of the samples, the method of pore mold is used in the observation of porosity microtexture of several typical Lower Triassic Jialingjiang carbonate rocks in Xishui, Guizhou province and in Luzhou, Sichuan province. It is shown that the types of pores mostly are residual intergranular pores, spreading intergranular pores, intragranular dissolved pores, intercrystalline pores and so on. The shapes of pores mainly are ruled near-equiaxial, triangular or polygon, asterion, Y-shaped and so on. The throats are mainly flak and flake curved. Pores distribute as spots in some dense areas in samples and connecting throats are lack from each other among these spots. Obvious difference of porosity microtexture in dissimilar rocks implies different sedimentary environments. |
