天然气地球科学 ›› 2022, Vol. 33 ›› Issue (9): 1476–1484.doi: 10.11764/j.issn.1672-1926.2022.04.011

• 天然气地球化学 • 上一篇    下一篇

鄂尔多斯盆地富县古生界天然气成因及气源综合识别

王杰1,2(),贾会冲3,孙晓3,陶成1,2,张毅1,2,马亮帮1,2,王付斌3,姜海健1,2   

  1. 1.中国石油化工集团公司油气成藏重点实验室,江苏 无锡 214126
    2.中国石化石油勘探开发研究院无锡石油地质研究所,江苏 无锡 214126
    3.中国石化华北油气分公司勘探开发研究院,河南 郑州 450006
  • 收稿日期:2021-04-12 修回日期:2022-03-23 出版日期:2022-09-10 发布日期:2022-09-09
  • 作者简介:王杰(1975-),男,河南周口人,高级工程师,博士,主要从事油气地质及有机地球化学研究. E-mail:wangjie.syky@sinopec.com.
  • 基金资助:
    国家自然科学基金“海相深层不同类型有机质Re—Os赋存形式及年龄地质意义”(42072154);中国石化股份公司科技部鄂尔多斯项目群“鄂尔多斯盆地古生界资源潜力评价”(P17009-2);“鄂尔多斯盆地元古—下古生界目标评价与关键技术”(P20043)

Comprehensive evaluation on origin and source of natural gas in the Paleozoic in Fuxian area, Ordos Basin

Jie WANG1,2(),Huichong JIA3,Xiao SUN3,Cheng TAO1,2,Yi ZHANG1,2,Liangbang MA1,2,Fubin WANG3,Haijian JIANG1,2   

  1. 1.SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms,Wuxi 214126,China
    2.Wuxi Research Institute of Petroleum Geology,SINOPEC,Wuxi 214126,China
    3.Research Institute of Exploration and Development,Huabei Company,SINOPEC,Zhengzhou 450006,China
  • Received:2021-04-12 Revised:2022-03-23 Online:2022-09-10 Published:2022-09-09
  • Supported by:
    The National Natural Science Foundation of China(42072154);the Major Science and Technology Projects of SINOPEC(P17009-2)

摘要:

近年来,鄂尔多斯盆地南部(简称鄂南)古生界天然气勘探取得重要进展,展示了良好的勘探前景,但鄂南古生界天然气成因及气源研究相对薄弱,直接制约了下一步的勘探部署。为此通过系统开展富县古生界天然气组分、烷烃气碳氢同位素、稀有气体组分和同位素等地球化学分析,查明了鄂南富县古生界天然气中甲烷占绝对优势,含有一定量的重烃,非烃气CO2、N2含量相对较高,显示其为过成熟阶段生成的干气。鄂南富县古生界天然气以典型油型气为主,煤型气为辅,甲烷和乙烷的碳同位素组成存在倒转现象可能为油型气与煤型气的混合造成,上古生界天然气烷烃气碳同位素组成普遍比下古生界天然气偏重,可能混有相对较多的煤型气。综合运用烃源岩干酪根碳同位素—岩石脱附气碳同位素—天然气乙烷碳同位素、天然气甲烷氢同位素、稀有气体Ar同位素定年等综合地球化学手段,推断出鄂南富县古生界天然气可能主要来源于下古生界马家沟组烃源岩。

关键词: 天然气成因, 气源判识, 富县, 古生界, 鄂尔多斯盆地

Abstract:

In recent years, important progress has been acquired in the exploration of natural gas in the Paleozoic in the southern part of the Ordos Basin, which has shown a good exploration prospect. However, the study on the origin and source of natural gas in the Paleozoic in the area is relatively weak, which directly restricts the next exploration project in the Paleozoic in the southern part of the Ordos Basin. By means of systematic analysis of gas components, carbon and hydrogen isotopes, noble gas components and isotopes in the Paleozoic natural gas in Fuxian area, it is found that methane is the absolute dominant component in the natural gas with a certain amount of heavy hydrocarbons, and the carbon dioxide and nitrogen content is relatively high. The above characteristics show that the Paleozoic natural gases in Fuxian area are dry gases generated in over mature evolution. According to isotopic characteristics, it is concluded that the Paleozoic natural gases in Fuxian area are dominated by typical oil-type gas, supplemented by coal-type gas. The inversion of carbon isotopic composition of methane and ethane may be caused by the mixing of oil-type gas and coal-type gas, and the oil-type gas is predominant in the natural gas. The carbon isotopes of the Upper Paleozoic hydrocarbon gas are relatively heavier than that of the Lower Paleozoic, which shows that the Upper Paleozoic gas may be mixed with more coal type gas. By means of comprehensive geochemistry such as the carbon isotope of source rocks desorption gas and natural gas and kerogen, methane hydrogen isotope and argon isotopic dating method, it demonstrates that the Paleozoic natural gas in Fuxian area in the southern part of Ordos Basin mainly originated from the source rocks of the Majiagou Formation in the Lower Paleozoic.

Key words: Natural gas origin, Gas source evaluation, Fuxian area, Paleozoic, Ordos Basin

中图分类号: 

  • TE122.1

图1

鄂尔多斯盆地大型气田分布"

表1

鄂南富县古生界天然气地球化学分析数据"

井号层位组分含量/%δ13C/‰δD1 /‰
H2N2CO2CH4C2H6C3H8iC4H10nC4H10CO2C1C2C3
XF3-1马五60.261.2711.3583.542.950.550.07-11.7-30.7-36.4-32.9-157
XF3-2马五60.305.527.9285.620.520.12-6.7-30.2-36.1-31.7-155
FG4马五50.769.3088.940.230.01-4.3-32.6-37.0-30.4-159
XF11马五12.020.8316.9877.721.660.500.070.17-4.5-31.6-39.6-31.9-161
FT1马五52.385.5991.590.390.06-33.7-37.5-30.5
FP1H-1盒10.364.357.0286.71.000.400.10-8.2-30.2-33.9-29.8-147
FP1H-2盒10.144.206.9687.970.610.13-6.4-30.3-36.1-31.7-150
XF9上石盒子组0.062.496.5389.231.460.25-13.7-26.7-32.1-31.6-146

图2

鄂南富县古生界天然气碳同位素组成特征"

图3

鄂南富县古生界天然气烷烃气碳同位素组成特征及其成因类型"

图4

鄂南富县古生界天然气二氧化碳含量与其碳同位素组成的关系"

图5

鄂南富县古生界天然气乙烷碳同位素与潜在烃源岩干酪根碳同位素组成对比"

表2

鄂尔多斯盆地马家沟组烃源岩脱附气的碳同位素分析数据"

井号层位深度/mTOC校正/%δ13C1/‰δ13C2/‰δ13C3/‰
LT1-1马五段2 591.00~2 591.541.20-41.4-28.8/
LT1-2马五段2 594.60~2 594.800.76-40.9-30.3/
LT1-3马五段2 720.350.95-40.1-31.3/
LT1-4马四段2 985.820.52-38.2-31.8/
LT1-5马三段3 206.50~3 207.000.67-39.8//
LT1-6马一段3 384.50~3 387.000.48-37.8-31.0/
XF5-1马五6亚段2 889.000.57-39.2-37.9-30.6
XF5-2马五6亚段2 894.000.66-40.6-34.4-27.6
XF5-3马五62 900.301.35-39.5-37.8-28.2
D113-6马五5亚段2 921.75~2 923.671.43-39.4-28.9-26.1
D113-22马五1-4亚段2 897.23~2 898.120.83-35.0-29.9-29.3
D113-30马五1-4亚段2 885.31~2 887.081.37-39.6-28.3-29.6

图6

鄂南富县古生界天然气与马家沟组烃源岩脱附气碳同位素组成对比"

图7

鄂南富县古生界天然气甲烷氢同位素组成特征与乙烷碳同位素组成特征"

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