The Explanation on the Turnover of Carbon Isotopic Compositions of Hydrocarbon Series of Natural Gases in the Northern and Central Tarim Basin
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摘要: 塔里木盆地塔北、塔中地区天然气中烷烃气碳同位素组成序列存在着局部倒转现象,通过对此的研究和解释,初步认为塔北、塔中天然气中的烷烃气可能是以有机成因气为主;轮台构造单元天然气烷烃系列的δ13C3＞δ13C4倒转可能是混入了偏腐泥型的烷烃气体;轮南低凸起构造单元的天然气烷烃同系物碳同位素组成序列正常,天然气来源单一;塔中地区天然气按CH4和C2H6的碳同位素组成特征可分成两组,可能代表了两种不同的成因类。
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关键词:
- 塔北、塔中 /
- 天然气 /
- 烷烃同系物碳同位素组成序列倒转
Abstract: Abstract the carbon isotopic compositions of hydrocarbon series were measured from natural gases in the Northern and central tari m basin . any local turnover phenomena,e.g. δ13c1 ＞δ13c2＞δ13c3 or δ13c1 ＞δ13c2＞δ13c3＞δ13c4，exist in the carbon isotopic compositions of hydrocarbon series. they suggests thathydrocarbons of the natural gases may be mainly biogenic in the Northern and central tarim basin. ost of natural gas samples have the turnovers of δ13 c3 ＞δ13 c4 from the Northern Slope Zone in the Luntai uplift,and the cause of the turnovers may be that these natural gases were mixed less amount of sapropelic hydrocarbons. according to δ13c1values of natural gases and whether they have the δ13c1 ＞δ13c2 turnover,natural gases in the central tarim basin can be divided in to two groups. Natural gases of the first group have heavy δ13c1 values,bet ween -2l.l %"-30.7 %，and the13c1＞δ13c2turnover,such as tz26(0)well,tzl03(cⅡ）well and tzl03(cⅢ）well ；the others have light δl3c1，δl3c2 values,with -4l.0 %"-43.7 %，and -38.8 %"-39.6 %，respectively,without the δ13c1 ＞δ13c2 turnover,such as t24sp-3(cⅢ），tz4-8-30(cⅢ），tz-l(0)and tz45(0)well. t may suggest that less amount of abiogenic hydrocarbons was contained in natural gases of the first group,and that natural gases in the central tarim basin have two genetic types. all the natural gases do not exist turnover of carbon isotopic compositions fromthe Lunnan Lower- uplift,suggesting that they may come from the same source. -
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