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Study on control factors for forming volcanic reservoir in Xingcheng development area of Xushen Gas Field

YAN Lin1,ZHOU Xue-feng1,GAO Tao2,WANG Yong-jun1 (1.Exploration and Development Research Institute of PetroChina,Beijing 100083,China;2.Exploration and Development Research Institute of Daqing Oilfield Company Ltd.,Daqing 163712,China)  
Xingcheng development area of Xushen Gas Field lies in Xujiaweizi Rift.Its reservoir is volcanic rocks of first member of Yingcheng Formation with characteristics of low porosity and permeability.The gas is mainly produced from rhyolite and volcanic rocks,and the main reservoir space includes stoma,intergranular pores,dissolved pores in the crystals of feldspar,dissolved pores in the matrix and structural fissure.Comprehensive analysis shows that the control factors for forming volcanic reservoir include tectonic action,lithofacies and diagenesis.Tectonic action leads to formation of structural fissure,which becomes effective drainage system,lithofacies decides the forming degree of original pores,and diagenesis modifies original pores and fissures.Lithology is different,and main control factor of reservoir forming is different.
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