鄂尔多斯盆南部上古生界天然气地球化学特征——以志丹-甘泉地区为例
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P618.13

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陕西省教育厅重点项目(15JS093);国家自然科学(41502132)


Geochemical Characteristics of Upper Paleozoic Natural Gas in Southern Ordos Basin:A Case Study Of Zhidan Ganquan Area
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    摘要:

    通过对志丹-甘泉地区天然气样品的组分、稳定碳氢同位素的测定,综合分析、对比、认为:①鄂尔多斯盆地甘泉-志丹地区天然气主要组分甲烷的稳定碳同位素主要分布在-32‰≤δ13C1≤-25‰范围内,乙烷的稳定碳同位素主要分布在-38‰≤δ13C2≤-24‰范围内,天然气甲烷氢同位素主要分布在-170‰≤δ2D1≤-160‰内;②研究区碳氢同位素相比北部苏里格气田偏重,天然气类型主要为煤系烃源岩Ⅲ型干酪根初次裂解气,同时混有少量液态烃的二次裂解气。该区天然气已发生明显的次生变化,但是扩散运移和外部气源的混入都可以使测试样品发生碳同位素的斜率的倒转;③运移分馏是造成该区天然气产生碳同位素倒转和次生变化的主要原因之一。以上成果认识对本区天然气地球化学特征具有重要指导作用,对类似盆地天然气地球化学特征研究具有一定借鉴价值。

    Abstract:

    Through the determination, comprehensive analysis and comparison of the components, stable carbon and hydrogen isotopes of natural gas samples in Zhidan-Ganquan area, it is considered that: (1) The stable carbon isotopes of methane, the main component of natural gas in Ganquan-Zhidan area of Ordos Basin, are mainly distributed in the range of -32‰≤δ13C1≤-25‰, and the stable carbon isotopes of ethane are mainly distributed in the range of-38‰≤δ13C2≤-24‰. Methane hydrogen isotopes are mainly distributed in -170‰≤δ2D1≤-160‰. Secondly, the hydrocarbon isotopes in the study area are heavier than those in the northern Sulige gas field. The natural gas type is mainly primary kerogen type III pyrolysis gas from coal-bearing source rocks and secondary pyrolysis gas mixed with a small amount of liquid hydrocarbons. The natural gas in this area has undergone obvious secondary changes, but both diffusion and migration and the mixing of external gas sources can cause the slope inversion of carbon isotopes in the tested samples. 3. Migration and fractionation is one of the main reasons for the carbon isotope inversion and secondary changes of natural gas in this area. The above results play an important role in guiding the geochemical characteristics of natural gas in this area, and have certain reference value for the study of geochemical characteristics of natural gas in similar basins.

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陈军军,赵靖舟,李军,等. 鄂尔多斯盆南部上古生界天然气地球化学特征——以志丹-甘泉地区为例[J]. 科学技术与工程, 2020, 20(26): 10598-10604.
CHEN Junjun, ZHAO Jingzhou, LI Jun, et al. Geochemical Characteristics of Upper Paleozoic Natural Gas in Southern Ordos Basin:A Case Study Of Zhidan Ganquan Area[J]. Science Technology and Engineering,2020,20(26):10598-10604.

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历史
  • 收稿日期:2019-10-24
  • 最后修改日期:2020-06-02
  • 录用日期:2020-03-12
  • 在线发布日期: 2020-10-21
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