用储层岩石抽提物的饱和烃色谱指纹识别油气层

利用储层岩石抽提物的饱和烃色 质总离子图的指纹特征判识储层的流体（油、气）类型。油层或油饱和的储层，饱和烃色 质总离子流图的特征是正构烷烃碳数分布宽，碳数分布在C₁₅～C₃₈之间，与原油样品的正构烷烃碳数分布相似；凝析气层的正构烷烃碳数分布略窄一些，碳数分布在C₁₅～C₃₅之间，低碳数（小于C₂₁）的正构烷烃相对于油层富集，高碳数（大于C₂₁）的正构烷烃丰度明显低于油层；干气层的正构烷烃碳数分布最窄，碳数分布在C₁₅～ C₂₈之间，只有低碳数的正构烷烃，高碳数的正构烷烃丰度极低。据此可用来识别油层、凝析气层和干气层，也可用于一些测井资料不全或测井质量差的老井的油气层复查、测井难以识别的火成岩油气层的识别，还可用于地层评价，为油气酸化层位的优选提供科学依据。

Identifying Oil and Gas intervals Using Saturated Hydrocarbon Chromatography Fingerprints of Reservoir Extracted Hydrocarbon

Reservoir fluid types are usually identified by logging well technology,repeat formation test or geology ang geochemistry logging during drilling,and logging well interpreting is based on the physical property of reservoir fluids,there will be difficult in interpreting some low resistance oil intervals or volcannic rock oil reservoirs.However reservoir geochemistry technology can be remedial for those defects,which can directly identify reservoir fluid types(oil and gas)based on the fluid chemical character. authors use mass chormatography total ion chart of saturated hydrocarbon extracted from reservoir sandstones to indentify reservoir fluid types(oil and gas)).Fingerprints of oil saturated sandstones or oil intervals show wide n alkane distribution,which ranges from C 15 to C 38 ,and is similar to those of oil sample;fingerprints from condensate sandstone show lightly abbreviated n alkane distribution,which ranges from C 15 to C 35 ,but the content of high hydrocarbon compounds(>C 21 ) is apparently lower than that of oil sandstone;fingerprints from dry gas sandstone show a further abbreviated n alkane distribution,which ranges from C 15 to C 28 ,the content of high carbon compounds is very low,but the content of low carbon compounds is abundant,so this technology can be used to identify the types of reservoir fluid(oil and gas),reevaluate oil and gas intervals in old well whose log data is incomplete,and provide scientific evidence for optimizing acid treatment intervals.