摘要
对于多气源的沉积盆地来说,如何鉴别煤成气与油成气,是一个急待解决的问题。文留煤成气藏发现后,我们多途径研究了该气藏中天然气和凝析油的各项地化指标,发现这些指标与下第三系油成气有明显差别。利用这些差别,可鉴别各天然气藏的成因类型,并指出煤成气与油成气勘探的有利地区和有利部位。
Abstract
The natural gas of Wenliu gas pool in Dongpu depression,Henan Provin-ce,is considered to be originated from coal series of Permo-Carboniferous.The reservoir rocks are Lower Tertiary sediments.Methane contents of the gas is 95.12%,the ratio of C alkane to C alkane is 3.84%,condensate is22.98g/m.The average value of Ar/Ar is 1,231,much greater than thatof oil field gas in the same system of this same depression(441 for the oil-field gas)whereas δC-average value of methane is -28.16‰,which is 12.86‰ higher than that of the above mentioned oilfield gas,δD value is -182‰,Hg is 5.11×10ng/m.δC-value of the accompanying condensate is -24.5‰,while paraffin in-dex is 8.09,heptane value 41.76%,benzene 11.04%,methylbenzene 5.94% and its peak carbon mumber is C or C,Pr/Ph is 0.77.
论文详情