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兴城气田火山岩储层岩性复杂,储集性能迥异。为了比较不同火山岩储集特征,寻找优质储集体,从火山岩储层孔隙成因及演化入手,应用岩心分析测试及镜下鉴定手段,对岩石组构、成岩作用以及储层物性对构造作用的响应3个岩石储集性能的影响因素进行研究,分析对比了兴城气田各类火山岩进行储集性能。分析认为,火山岩储层物性主要受成岩作用的类型及发育程度以及构造作用控制,而岩石组构决定了火山岩所发生的成岩作用类型,也决定了构造作用对储层的改造程度,有利的岩石组构是是形成优质储集体的前提;即岩石组构、成岩作用、构造作用三者影响储集空间的演化,岩石组构是火山岩储层储集性能的主要控制因素;研究区内有利岩石组构储集岩性有火山角砾岩、气孔流纹岩、角砾熔岩;其中,角砾熔岩的岩石组构利于原生孔隙的保存与次生孔隙的发育,储集性能最优,火山角砾岩与流纹岩次之,火山集块岩、凝灰岩、致密流纹岩、低孔流纹岩不易形成有效储集体。
Xingcheng gas field volcanic reservoir lithology complexity, different storage performance. In order to compare the characteristics of different volcanic reservoirs and search for high-quality reservoirs, the author started from the origin and evolution of the pores in volcanic reservoirs, and applied core analysis and microscopic identification to the response of tectonics to the rock formation, diagenesis and reservoir physical properties The influencing factors of rock reservoir performance were studied, and the reservoir performance of various volcanic rocks in Xingcheng gas field was analyzed and compared. The analysis shows that the physical properties of volcanic reservoirs are mainly controlled by the type and degree of diagenesis and tectonism, and the rock formation determines the types of diagenesis that volcanic rocks occur. It also determines the degree of tectonic effect on reservoir modification, favorable rock Structure is the prerequisite for the formation of high-quality reservoirs. That is, the rock formation, diagenesis and tectonism affect the evolution of reservoir space. The rock formation is the main controlling factor for the reservoir performance of volcanic reservoirs. The favorable rock The structural reservoir lithology is volcanic breccia, stoma rhyolite and breccia lava. The rock structure of breccia lavas is conducive to the preservation of primary pores and the development of secondary pores, and the reservoir performance is optimal. The volcanic angle Conglomerate and rhyolite are second, volcanic rocks, tuff, dense rhyolite, low-porosity rhyolite difficult to form an effective reservoir.