摘要
吐哈盆地的天然气依据成因可划分为油型气、煤型气、混源气和生物改造气4种类型。油型气主要产于托克逊凹陷及哈密凹陷,具有δC-δC值高、δC<-2.88%和演化程度较高等特征；煤型气主要富集于台北凹陷(鄯善油田、巴喀油田例外),具δC低、重烃气碳同位素重、δC>-2.88%等特征；混源气仅分布于鄯善油田及丘陵油田东块,具δC<δC<δC>δC的碳同位素“倒转”分布特征；生物改造气仅见于巴喀油田及丘陵油田陵4井区,具有密度小、干燥系数大、C/C及C/C值高、δC>δC等特点。
Abstract
The natural gases in Turpan-Hami Basin can be divided into 4 genetic types:oil-type gas,coal-formed gas,mixture source gas and biological remaking gas.Oil-type gas is mainly distributed in Tuokexun and Hami Sags,and characterized by high δC-δC,high maturity,δC<-2.88%;coal formed gas is enriched in Taibei Sag,and characterized by low δC,high δC,δC ratios,δC>-2.88% et. al.;mixture source gas is distributed in Taibei Sag,Shanshan Oilfields and eastern Qiuling Oilfields,characterized by δC<δC<δC>δC“reverse”carbon isotopic;biological remaking gas is distributed only in Baha Oilfields and Ling 4 well area in Qiuling Oilfields in Taibei Sag,and characterized by low density,big dry coefficient,high ratios of C/C,C/C and He/He of,δC>δC et. al..
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