The Explanation on the Turnover of Carbon Isotopic Compositions of Hydrocarbon Series of Natural Gases in the Northern and Central Tarim Basin
-
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。
-
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. -
[1] 徐永昌. 天然气成因理论及应用[C]. 北京: 科学出版社, 1994[Xu Yongchang.The Origin Theories and Applications of Natural Gases[C].Beijing:Science Press,1994] [2] 戴金星,裴锡古,戚厚发.中国天然气地质学[C]. 北京: 石油工业出版社, 1992[Dai Jinxing,Pei Xigu,Qi Huofa.Chinese Geology of Natural Gases[C].Beijing:Petroleum Industry Press,1992] [3] Hoefs J. Stable Isotope Geochemistry[M]. Berlin: Springer-Verlag, 1980 [4] 戴金星.概论有机烷烃气碳同位素系列倒转的成因问题[J]. 天然气工业,1990,6: 15～20[Dai Jinxing.Simply discussion on the origin of the turnover of carbon isotopic compositions of hydrocarbon series of natural gases[J].Gases Industry,1990,6:15～20] [5] 王国安,申建中,季美英.塔北、塔中天然气中CO2的碳同位素组成及成因探讨[J].地质地球化学,2001,29(4):36～39[Wang Guoan,Shen Jianzhong Ji Meiying.Carbon isotopic compositions and origin of CO2 of natural gases in Northern and Central Tarim Basin[J].Geology Geochemistry,2001,29(4):36～39] [6] Javoy M, Pineau F, Demaiffe D. Nitrogen and carbon isotopic composition in the diamonds of Mbuji Mayi (Zalre)[J]. Earth and Planetary Science Letters, 1984,68: 399～412 [7] Peters K E, Sweeney R E, Kaplan I R. Correlation of carbon and nitrogen stable isotope ratios in sedimentary organic matter[J]. Limnology and Oceanography, 1978, 23 (4): 598～604 [8] Greg H R, Michael A A, Walter E D. 15 N/14N variations in Cretaceous Atlantic sedimentary sequences: implication for past changes in marine nitrogen biogeochemistry[J]. Earth and Planetary Science Letters, 1987,82: 269～279 [9] 陈践发,徐永昌,黄第藩.塔里木盆地东部地区天然气地球化学特征及成因探讨(之二)[J].沉积学报,2001,19(1):141～144[Chen Jian fa,Xu Yongchang,Huang Difan.Geochemical characteristics and origin of natural gas in east portion of Tarim Basin(Ⅱ)[J].Acta Sedimentologica Sinica,2001,19(1):141～144] -
点击查看大图
计量
- 文章访问数: 518
- HTML全文浏览量: 11
- PDF下载量: 421
- 被引次数: 0
下载:
