摘要
油气储层孔隙可分为毫米级孔、微米级孔、纳米级孔3种类型,常规储层孔隙直径一般大于1μm。北美地区页岩气储层纳米级孔径范围为5～160nm,主体为80～100nm。在对中国非常规油气储层研究中,应用场发射扫锚电子显微镜与纳米CT重构技术,首次发现了小于1μm的油气纳米孔。其中,致密砂岩油气储层中纳米级孔隙以颗粒内孔、自生矿物晶间孔及微裂缝为主,喉道呈席状、弯曲片状,孔隙直径范围10～1000nm,主体为300～900nm;页岩气储层纳米级孔隙以有机质内孔、颗粒内孔及自生矿物晶间孔为主,孔隙直径范围5～300nm,主体为80～200nm。纳米级孔是致密储层连通性储集空间的主体。纳米级孔隙系统的发现,改变了微米级孔隙是油气储层唯一微观孔隙的传统认识,为认识常规油气局部富集,非常规油气连续聚集的地质特征、研究连续型油气聚集机理、增加资源潜力具有重要的科学意义。
The oil and gas reservoirs have been divided in three types： Millimeterpore,micropore and nanopore.The diameter of pore throat in conventional reservoir is generally larger than one micron.The diameter of nano-pore in shale gas reservoirs ranges between 5 and 160 nanometers in North American,mainly from 80 to 100 nanometers.Based on the field emission SEM and the nano CT reconfiguration technique,it was the first discovery of nano-pore in research of unconventional tight sandstone and shale gas reservoir in China,whose diameter is less than one micron.The nano-pore in tight sandstone gas reservoirs is mainly of grain micropore,authigenic mineral intragranular pore and microfracture,throat is sheetlike,bended platy,has poor connectivity and its diameter ranges between 10 and 1000 nanometers,mainly from 300 to 900 nanometers.The nanopore in shale gas reservoirs is mainly of organic matter nanopore,grain nanopore and authigenic mineral intragranular pore,and its diameter ranges between 5 and 300 nanometers,mainly from 80 to 200 nanometers.The nanopore is main body of connectivitive reservoir space in tight reservoirs.The discovery of nano-pore system within oil and gas reservoir has changed the traditional understanding that the micron-pore is exclusive.It also provided the significant scientific value with understanding geological characteristics of conventional oil and gas local accumulation,unconventionally continuous petroleum accumulation,develop petroleum accumulation mechanism and increase the potential of resources.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第6期1857-1864,共8页
Acta Petrologica Sinica
基金
国家油气重大专项项目(2011ZX001)资助
关键词
油气纳米孔
非常规油气
页岩气
致密油气
纳米油气
连续型油气聚集
Nano-pore
Unconventional petroleum
Shale gas
Tight sandstone gas
Nano petroleum
Continuous petroleum accumulation
