火山岩储层的岩石学评价

从火山岩岩石学研究出发，对火山岩储集条件予以论述。火山岩储集层有基性火山岩也有酸性火山岩。由于两者岩石物理性质的不同(如脆性、韧性)及其自身作用的差异，导致其破裂模式类型的转变，并呈现裂隙储臬空间或孔隙储集空间的多样形式。火山岩孔隙空间的次生加大，主要受控于火山岩岩石的矿物组成及其经不同程度的蚀变作用所产生的次生矿物的特征。文中按蚀变温度划分四个蚀变带，它反映出颗粒密度与岩石孔隙率的相应变化关系。在评价火山岩储臬能力时，火山岩岩石学是不可缺少的科学依据。

PETROLOGY EVALUATION OF VOLCANIC ROCK RESERVOIRS

Based on petrology study on volcanic rock, this paper discusses its reservoirconditions. Volcanic rock reservoir involves basic and acidic volcanic rocks. The differencesbetween the two types of rocks in physical property (such as fragileness and toughness) andfunction resulted in the variation of fracture pattern. and presented multiform fracture reservoir space and pore reservoir space. The secondary enlargement of pore space in volcanic rockis mainly controlled hy mineralogical composltion of volcanic rocks and characteristics of secondary mineral that is created by alteration of volcanic rocks in different degrees. In this paper, four a1teration zone are recognized according to alterational temperature. It reflects therelationship between density of granular particles and porosity of rocks. Petrology research ofvolcanic rocks is an indispensable scientiflc basis in reservoir ability evaluation of volcanicrocks.