塔河地区二叠系火山岩储集层特征

Permian volcanic reservoirs in the Tahe region

利用岩心观察及室内镜下鉴定、扫描电镜、黏土矿物X衍射分析和测井解释等研究方法,对塔里木盆地塔河地区二叠系火山岩的岩石学特征、物性特征及储集空间成岩演化进行研究,结果表明,塔河地区二叠系火山岩储集层主要为英安岩和火山角砾岩,其次为玄武岩和凝灰岩。火山岩储集空间可分为原生孔隙、次生孔隙两大类11亚类。孔隙类型以裂缝-孔隙型为主。火山岩先后经历了冷却成岩和次生成岩两个成岩阶段。次生成岩阶段是火山岩成为有效储集层的重要成岩作用阶段。

The petrologic property, reservoir physical property and porosity diagenetic evolution of the Permian volcanic reservoir in the Tahe region, Tarim basin, are studied by core observation, scanning electron microscope (SEM), X-ray diffraction (XRD) and well log interpretation. The results suggest that the volcanic reservoir rocks are mainly daeite and volcanic breccias, then basalt and tuff. The volcanic reservoir spaces can be divided into two types: primary pores and secondary pores, including 11 sub types. Fracture-pore assemblage is the main pore type. The volcanic reservoir experienced two phases of cooling diagenesis and secondary diagenesis. The secondary diagenesis is important for developing reservoir spaces, which contributed an effective reservoir for the volcanic rocks.