准噶尔盆地东部石炭系优质火山岩储层特征及分布规律

为研究准噶尔盆地东部石炭系优质火山岩发育规律，通过野外踏勘、岩心观察、铸体薄片鉴定、孔渗分析、测井及地震分析方法研究了火山岩储层特征及分布。结果表明：石炭系火山岩主要岩性岩相以溢流相安山岩、爆发相凝灰岩为主，其次为溢流相玄武岩、爆发相火山角砾岩；火山岩储层中气孔+溶蚀孔和溶蚀孔+裂缝型孔隙为有利的孔隙组合类型，溢流相玄武岩、安山岩和爆发相火山角砾岩储层物性最好，为优质储层发育岩性；优质火山岩储层发育受火山喷发环境、岩性岩相及后期构造改造综合控制，火山岩喷发环境决定了储集空间的发育程度与规模，水上喷发环境造成火山岩原生气孔较为发育，后期淋滤溶蚀改造较为强烈，因此水上喷发环境的火山岩储集性能要好于水下喷发环境；石炭系火山活动具有沿断裂呈串珠-中心式分布的特征，受到构造活动影响，靠近断裂的储层发育有大量的裂缝，对火山物性的改善至关重要，靠近断裂还可沟通烃源岩与储层，为后期有机酸溶蚀创造有利条件。可见准噶尔盆地东部石炭系火山岩油气勘探潜力巨大，火山岩储层中靠近断裂的水上近火山口爆发相和水下近火山口侵出相是最有利储层发育带，有利的火山岩区带主要分布在准噶尔盆地东部滴西地区、五彩湾地区和东部大井地...

Characteristics and controlling factors of Carboniferous high-quality volcanic reservoirs in eastern Junggar Basin

Volcanic rock is an important new field for global oil and gas exploration in the future. Carboniferous volcanic rocks are developed in the eastern Junggar Basin, which has great potential for oil and gas exploration. According to the field survey, observation volcanic cores and the identification of cast sections, the dominant lithofacies of the Carboniferous volcanic rocks are mainly the overflowing andesite eruption facies tuff, followed by the overflowing basalt eruption facies volcanic breccia. Gas pocket with dissolution pore and dissolution pore with fracture are favorable pore combination types