The Study on Reservoir Property and Characteristics of the Emeishan Basalts of Zhougongshan and Its Neighbour Area in the Southwest Sichuan

Key words: 
• Emeishan basalt /
• characteristics /
• diagenesis /
• reservoir

Abstract: In the southwest of Sichuan, Upper Permian Formation, the thickness of Emeishan basalts of Zhougongshan and its neighbor area is from 40m to 500m，and it is formed by 12 cyclic basaltic volcanic rock. The volcanic breccias in the bottom and the stomatal basalts in the upper have some reservoir capability in cyclicity. The reservoir spaces mainly are air voids，basaltia jointing split and tectoclase. Generally, they form lower porosities, medium permeability or lower porosities,higher permeability reservoirs. In other sections, if there are not the superposition of tectonic movement，most of them can not form reservoir rocks，during the formation and evolution of this set of reservoirs, the condensation contract fissure of magmatic melt，tectonic rupture，organic maturation and chemical erosion. All of these have promoted the forming of reservoir spaces. But hydrothermal alterations and 4 stage cementation and 3 stage packing action have obvious damage affection to reservoir spaces.