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准噶尔盆地东部北三台凸起石炭系填充序列为火山岩,其原生孔隙结构复杂,连通性较差,必须经过成岩作用和其他地质作用的改造才能成为有效储层。以测井、取心、录井、薄片鉴定、分析化验等资料为基础,研究了火山岩岩性、岩相、地层埋深、裂缝等因素对储层物性的影响。研究表明:该区火山岩储层中,凝灰岩和蚀变玄武岩的储集物性好于玄武岩,爆发相的物性好于溢流相;火山岩的孔隙度和渗透率受地层埋深影响较小,地层深处仍然可以形成良好储层;火山岩中裂缝十分发育,有利于油气运移和聚集成藏,为北三台地区火山岩形成良好的储层提供了有力支持。
The Carboniferous filling sequence of North Third Member in the eastern part of Junggar Basin is volcanic. The primary pore structure is complex and the connectivity is poor. Only after the diagenesis and other geologic alterations can it become an effective reservoir. Based on the data of logging, coring, logging, sheet identification and analysis, the effects of volcanic lithology, lithofacies, buried depth and fractures on reservoir physical properties are studied. The results show that the reservoir properties of tuffs and altered basalts are better than basalt in the volcanic reservoirs of this area, and the physical properties of the explosive facies are better than those of the overflow facies. The porosity and permeability of volcanic rocks are less affected by the burial depth of the strata, Which can still form good reservoirs. The fractures in volcanic rocks are well developed, which is favorable for hydrocarbon migration and accumulation and accumulation and provide strong support for the formation of volcanic rock reservoirs in the north.