吐─哈盆地天然气成因类型探讨  

GENETIC TYPE OF NATURAL GAS IN TURPANHAMI BASIN

作　　者：曾凡刚[1] 吴朝东[1] 苏传国 

机构地区：[1]北京大学地质系 [2]吐哈石油勘探开发会战指挥部

出　　处：《石油与天然气地质》1998年第2期162-164,共3页Oil & Gas Geology

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δ１３Ｃ３－δ１３Ｃ２值高、δ１３Ｃ２＜－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δ１３Ｃ１低、重烃气碳同位素重、δ１３Ｃ２＞－２８８等特征；混源气仅分布于鄯善油田及丘陵油田东块，具δ１３Ｃ１＜δ１３Ｃ２＜δ１３Ｃ３＞δ１３Ｃ４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、ｉＣ４／ｎＣ４及Ｃ２／Ｃ３值高、δ１３Ｃ２＞δ１３Ｃ３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 δ13C3-δ13C2,high maturity,δ13C2<-2880/0;coalformed gas is enriched in Taibei Sag,and characterized by low δ13C1,high δ13C2,δ13C3 ratios,δ13C2>-2880/0 et. al.;mixture source gas is distributed in Taibei Sag,Shanshan Oilfields and eastern Qiuling Oilfields,characterized by δ13C1<δ13C2<δ13C3>δ13C4“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 iC4/nC4,C2/C3 and 3He/4He of,δ13C2>δ13C3 et. al..

关 键 词：天然气 碳同位素 成因 吐-哈盆地 类型 

分 类 号：P618.130.1[天文地球—矿床学]