Abstract: Through the research of the drilling and seismic data, the asymmetrical model of volcanic eruption is built. It is proposed that the typical asymmetrical model of volcanic eruption style controlled by faults is characterized by one small-scale side on the higher part of faults and by the other large-scale side in the lower part of faults. Based on the statistics of 257 wells drilled volcanic rocks, the distribution regularities of volcanic rocks of Huoshiling and Yingcheng formation has been known. The comprehensive studies of features of the deep volcanic rocks and their physical properties suggest that the acidic volcanic rock is the best type of reservoir rock. The volcanic lithofacies controls distribution of high-quality reservoirs in every independent volcanic edifice. The acidic explosive facies around asymmetrical volcanic crater is the favorable zone for volcanic reservoirs. Deep fractures, which not only improve filtering conditions of seepage flow, but also impel growth of secondary pores, are important pathways for deep fluids as well as key factors for buildup of gas pool with high production. Besides, the high-angle fractures densely developed are easy to form the favorable reservoir zones with the assemblage of high-angle fractures and corrasive pores. In addition, the constructive diagenesis and super genesis are assignable factors for high quality reservoir forming.

Key words: fault basin, typical asymmetrical model, characteristics of volcanic eruption, controlling factors of high-quality reservoirs

摘要： 通过大量钻井资料及地震资料的对比研究, 建立松辽盆地不对称火山岩喷发模式, 指出火山岩在断层高部位向低洼区流动, 高部位一翼延伸规模小, 低洼区延伸规模大。在对全区257口钻遇火山岩探井统计的基础上, 明确了火石岭组和营城组火山岩的分布规律, 认为酸性火山岩是优势储层岩类; 火山岩岩相控制优质储层的分布, 近火山口不对称的酸性爆发相为火山岩有利储层发育相带; 裂缝是深部流体运移的重要通道, 能改善渗透条件, 促使次生孔隙发育, 是高产气藏形成的关键, 高角度裂缝和溶蚀孔隙组合带是火山岩储层发育的有利区带。此外, 建设性的成岩表生作用是优质储层形成不可忽视的因素。

关键词: 断陷盆地, 不对称, 火山岩喷发特征, 有利储层控制因素