Abstract
Applying sedimentology, lithology and petrography, the outcrops, core and cuttings are observed and described. All kinds of Middle Triassic Series breccias in Sichuan Basin are identified. Then the relationship maps of sedimentary facies and breccia, and paleostructure and breccia are drawn. Based on petrology statistic method, this paper analyzes the pore characteristics of different breccias. It is concluded that there are three kinds of breccias in Middle Triassic Series of Sichuan Basin: platform margin slope breccia, gypse breccia and cave collapse breccia, which are mainly controlled by western Sichuan Basin platform margin, early Indosinian movement and northern and southern Sichuan Basin uplifts. The transformation in diagenetic stage has great influence on the pore space. The pore spaces of cave collapse breccia in Middle Triassic Series of Sichuan Basin are relatively well developed.
论文详情