摘要
采用铸体薄片观察和压汞实验方法,识别松辽盆地南部王府断陷上侏罗统火石岭组火山岩类储层主要孔隙类型,分析孔隙微观结构特征。结果表明:王府气田火石岭组火山岩类储层储集空间主要由次生孔隙和裂缝构成。次生孔隙主要以溶蚀孔、脱玻化微孔为主;裂缝主要以构造缝、粒间溶蚀缝等为主。熔岩类主要发育脱玻化微孔,火山碎屑岩主要发育溶蚀孔和构造缝,熔岩—火山碎屑岩主要发育溶蚀孔和脱玻化微孔。溶蚀作用和裂缝作用的耦合增强火石岭组储层储集能力,改善储层渗流能力。在平均孔喉半径和平均配位数方面,火山碎屑岩(集块岩、火山角砾岩、凝灰岩)和熔岩—火山碎屑岩过渡类的大尺度孔喉系统较为发育。火山熔岩和熔岩—火山碎屑岩过渡类的微观孔隙结构好于火山碎屑岩类的,火石岭储层小尺度孔隙结构分为三类。Ⅰ型微观孔隙结构基本不发育。角砾熔岩、粗安岩、凝灰岩、凝灰熔岩主要以Ⅱ、Ⅲ型微观孔隙结构为主,孔隙结构相对较好;流纹岩、粗面岩、火山角砾岩以Ⅲ型微观孔隙结构为主,孔隙结构相对较差。
Pore types of Jurassic Huoshiling formation in Wangfu rift of the southern Songliao basin were identified as thin-sections,largeand small-scale pore structures were analyzed through visual thin-sections and mercury injection experiment respectively.Finally,micro-structure characteristic of Jurassic Huoshiling formation was revealed.Huoshiling formation is dominated by secondary pores and fractures,while the former mainly comprise dissolution pores and devitrified micropore,the latter are generally structure fractures and corrosion fractures.Lava is dominated by devitrified micropores,and volcanic clastic rocks are characterized by dissolved pores and structure fractures,and lava-volcanic clastic rocks are mainly dissolved pores and devitrified micropores.The reservoir quality is generally controlled by the dissolution,dehydration,structure,etc.The coupling of dissolution and fracture enhances reservoir capacity and improves flow property.The thin section reveals that the large-scale pore system varies with lithology.In terms of mean pore throat radius and mean coordination number,large-scale pore systems are developed in pyroclastic rocks and lava pyroclastic rocks.The mercury pressure test reveals that the micropore structure of volcanic lava and lava-pyroclastic rock is better than the volcaniclastic rock.The small-scale pore structure of the volcanic reservoir is divided into three types.Among them,the pore structure of type I is basically undeveloped.Breccia lava,coarse ante,tuff and condensate lava with typeⅡandⅢ pore structure indicate high-quality reservoir.Different from that,rhyolite,rough rock and volcanic breccia is dominated by typeⅢ pore structure,suggesting poor-quality reservoir.
作者
黄玉欣
阮宝涛
李忠诚
宋文礼
胡望水
Huang Yuxin;Ruan Baotao;Li Zhongcheng;Song Wenli;Hu Wangshui(School of Geosciences,Yangtze University,Wuhan,Hubei 430100,China;Research Institute of Petroleum Exploration and Development,Jilin Oilfield Company,PetroChina,Songyuan,Jilin 138000,China)
出处
《东北石油大学学报》
CAS
北大核心
2018年第6期1-9,121,共10页
Journal of Northeast Petroleum University
基金
国家科技重大专项(2016ZX05047-005)
关键词
孔隙类型
微观结构
上侏罗统
火石岭组
王府断陷
松辽盆地
pore types
micro pore-structure
upper Jurassic
Huoshiling fomation
Wangfu rift
Songliao basin
