关键词: 孔隙类型及分布特征, 孔隙演化, 主控因素, 火山岩储层, 西泉地区, 准噶尔盆地

Abstract: The distribution of the Carboniferous volcanic reservoir is controlled by many factors in Xiquan area, east Junggar Basin.
Comprehensive research on the pore distribution characteristics, major controlling factors and pore evolution of volcanic rocks was
conducted by analysis of core observation, casting thin sections, physical properties, integrated with the imaging logging and oil test
data. The result shows that high value area of physical properties mainly distributes at 3 intervals under the top of the Carboniferous
unconformity: 0-50 m, 70-115 m, 130-155 m, and the distribution of favorable reservoirs are controlled by lithology of volcanic rock,
weathering and leaching, and tectonic activities. The influence of lithology on reservoir performances depends on the volcanic eruption
intensity and lithofacies types of volcanic rocks, and mineral compositions, textures, and mechanical property of rocks. The factors of
weathering and leaching mainly controlled the formation of secondary pores of andesite and dacite and favorable reservoirs under the
unconformity surface of 0-50 m. Fractures generated by tectonic activities played a major role in controlling the formation of volcanic
breccia favorable reservoirs under the unconformity surface between depths of 70-115 m and 130-155 m. Formation and evolution of
volcanic reserving pores includes 3 stages: syndiagenetic stage, epidiagenetic stage and burial diagenetic stage，different diagenetic
stages have different effects on pore evolution.

Key words: pore types and distribution characteristics, pore evolution, the major controlling factors, volcanic reservoir, Xiquan area, Junggar Basin