Application of butane geochemistry of natural gas in hydrocarbon exploration
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- 作者：Zhongying Miao (1) (2)
Jianfa Chen (2)
Jing Wang (3)
Guannan Wang (2)
Chen Zhang (4)
Wei Li (2) - 关键词：Natural gas ; n ; butane ; isobutane ; carbon isotope ; genetic types of natural gas ; migration direction
- 刊名：Petroleum Science
- 出版年：2012
- 出版时间：December 2012
- 年：2012
- 卷：9
- 期：4
- 页码：455-462
- 全文大小：154KB
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Jianfa Chen (2)
Jing Wang (3)
Guannan Wang (2)
Chen Zhang (4)
Wei Li (2)
1. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037, China
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China
3. Luliang Oilfield Operation District, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang, 834000, China
4. Department of Natural Gas, PetroChina Tarim Oilfield Company, Korla, Xinjiang, 841000, China - ISSN：1995-8226
文摘
In order to distinguish the source and migration direction of natural gas by geochemical characteristics of butane, the components and carbon isotopes of natural gas from major hydrocarbonbearing basins in China were analyzed. The results showed that: (1) Oil-type gas has i-C4/n-C4<0.8, δ13Cbutane <?8- δ 13C i-butane <?7- δ 13C n-butane <?8.5- whereas coal-type gas has i-C4/n-C4>0.8, δ 13Cbutane >?5.5- δ 13C i-butane >?4- δ 13C n-butane >?6- (2) When δ 13C i-butane-δ 13C n-butane is greater than 0, the maturity of oil-type gas is generally more than 2.4% and that of coal-type gas is greater than 1.4%, whereas when the difference is less than 0, the maturity of oil-type gas is generally less than 1.1% and that of coal-type gas is less than 0.8%. (3) When natural gas migrates through dense cap rocks, the value of i-C4/n-C4 increases, whereas when it migrates laterally along a reservoir, the value of i-C4/n-C4 decreases. (4) Sapropelic transition zone gas with composition and carbon isotopic signatures similar to those of oil-type gas in the low thermal evolution stage is found to have a relatively high butane content. (5) The values of i-C4/n-C4 and δ 13C n-butane δ 13C i-butane of gas which has suffered biological degradation are significantly higher than those obtained from thermogenic and bio-thermocatalytic transition zone gas. Thus, natural gas of different genetic types can be recognized through component analysis and carbon isotopic signatures of butane, the natural gas maturity can be estimated from the difference in carbon isotopic content between isobutane and n-butane, and the migration direction of natural gas can be determined from i-C4/n-C4 ratios and transport conditions, which can also be used to thermogenic and bio-thermocatalytic transition zone gas.