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通过对岩心和普通薄片的观察、荧光薄片及扫描电镜的分析,从火山岩岩性、孔隙类型、含油气性及成岩作用等方面研究,发现准噶尔盆地陆西地区石炭系火山岩岩性主要以火山熔岩及火山碎屑岩为主。火山熔岩主要包括玄武岩和安山岩,含油气性相对较好。火山碎屑岩主要为凝灰岩和火山角砾岩。孔隙类型主要以溶蚀孔隙和次生裂缝为主。因火山岩只有经过后期风化淋滤作用、断裂改造作用及溶蚀作用改造后才能成为有效储层,浊沸石充填对研究区优质储层的形成可能具有极好的控制作用。在研究的基础上建立了研究区不同类型火山岩储层的孔隙演化模式。
Through the observation of core and common sheet, the analysis of fluorescent sheet and scanning electron microscope, the lithology of volcanic rocks, pore types, hydrocarbon-bearing and diagenesis are studied. It is found that the lithology of Carboniferous volcanic rocks in Luxi area of Junggar Basin mainly consists of volcanic lava And pyroclastic rocks. Volcanic lava mainly includes basalt and andesite, with relatively good hydrocarbon-bearing properties. Pyroclastic rocks are mainly tuffs and volcanic breccias. Pore types are mainly dissolved pores and secondary cracks. Volcanic rocks can only become effective reservoirs after they have been retrograded by weathering and leaching, fracture modification and dissolution. Pleistocene zeolite filling may have very good control on the formation of high-quality reservoirs in the study area. Based on the study, the pore evolution models of different types of volcanic reservoirs in the study area have been established.