三塘湖盆地牛东油田火山岩岩性岩相特征及其对储集性能的控制作用

Lithologic and Lithofacies Features of Volcanics and Their Control on Reservoir Capability in Niudong Oilfield of Santanghu Basin

为评价火山岩储集性能,优化评价井位部署,为牛东油田储量升级及产能建设方案的编制提供科学依据,以连续取心井资料为基础,通过岩心观察、薄片鉴定、全岩分析和测井解释,在牛东油田识别出火山熔岩和火山碎屑岩2大类10种火山岩岩石类型,其中火山熔岩以安山岩和玄武岩为主,火山碎屑岩以火山角砾岩和凝灰岩为主。通过钻井、测井、地震多学科结合,建立了3大类6种火山岩相,包括溢流相、爆发相和火山沉积相,以溢流相为主,火山活动表现出裂隙式喷发的特点。结合火山岩储层微观特征研究,认为火山岩岩性岩相是控制火山岩储集性能优劣的基础。

To evaluate the storage performance of volcanic rocks, optimize arrangement of well sites and lay a scientific foundation for reserves upgrading and producibility construction in Niudong Oilfield, on the basis of continuous coring data, two groups (volcanic lava and volcanoclastic rock) of volcanic rock, which included 10 types, were identified through core observation, thin-section analysis, composition analysis of silicate rock, ECS composition identification and FMI rock texture and frame explanation. Meanwhile, in combination of drilling, logging data with seismic data, three groups and six types of volcanic lithofacies, including mainly effusive facies, explosive facies and volcanic sedimentary facies are found. Volcanic activities are characterized by fissure eruption. In combination with study on microscopic features of volcanic reservoirs, it is considered that volcanic lithology and lithofacies are the main factors dominating the reservoir performance of volcanic rocks.