Diagenesis of Volcanic Rocks and Its Effects on Physical Properties of Reservoirs of Kalagang Formation in Malang Sag of Santanghu Basin

Abstract

Abstract: Based on the core description, thin section analysis, pore character, microphotograph and scanning electric microscope observation, the petrological characteristics and diagenesis of volcanic reservoirs of Kalagang formation of the Upper Carboniferous in Malang sag are studied. The results show that the volcanic rocks of Kalagang formation consist mainly of basalt, andesite and volcanic breccia; the vaporization of volatile matter, dissolution, weathering and leaching process allow the reservoir quality to be better, the filling process makes the reservoir quality become poor, and the metasomatism is of the dual nature. The horizon of Metasomatism and the level of filling after mineral transmigration have a regularity of vertical zonation, of which the former becomes better in petrophysical property.

Key words: Malang sag, Kalagang formation, volcanic reservoir, diagenesis, secondary pore

CLC Number:

TE112.222

LEI Hai-yan, LIU Cheng-zhi, HE Ren-zhong, WANG Xin, CHEN Xuan, YU Hai-shan. Diagenesis of Volcanic Rocks and Its Effects on Physical Properties of Reservoirs of Kalagang Formation in Malang Sag of Santanghu Basin[J]. Xinjiang Petroleum Geology, 2011, 32(5): 480-483.

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