Based on the core slice and the geochemistry data, starting from the basic characteristics of volcanic reservoir, the diagenesis of volcanic rocks and the formation mechanism of volcanic reservoir are analyzed. Study obtained that the volcanic rocks of Malang sag are mafic alkaline-calc-alkaline series rocks and formed in Island arc. The main lithology is basalt. The volcanic phase contain mainly effusive facies, explosive facies and volcanic sedimentary facies, The reservoir space is divided into two types: pores and cracks,especially the secondary dissolution porosity. Reservoir properties is middle-low, and permeability is low-ultra-low. Diagenesis and reservoir formation mechanism showed that: Tectonics, weathering and leaching factor is the major role in the formation of secondary pores; Acidic and alkaline fluid' s dissolution is the main mechanism of the formation of volcanic reservoir in this area.%利用岩心、薄片、及地化分析资料,从火山岩储层基本特征研究出发,对火山岩成岩作用与火山岩储层形成机制进行了分析.研究得出,马朗凹陷火山岩为岛弧环境下形成的中基性碱性-钙碱系列岩石.岩性以玄武岩为主,发育溢流相、爆发相和火山沉积相类型.储集空间分为孔隙和裂缝两种类型,以次生孔隙尤为发育.储层物性上具中低孔,低-特低渗特征.成岩作用与储层形成机制分析表明,构造作用、风化淋滤因素是形成次生孔隙的主要作用.酸性和碱性流体叠加溶蚀作用是本区火山岩储层形成的主要机制.
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