| Discrimination of abiogenic and biogenic alkane gases |
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| 摘 要： | We have combined the analytical data of the carbon isotope distribution pattern, R/Ra and CH4/3He values of abiogenic and biogenic (referring to the thermogenic and bacterial or microbial) alkane gases in China with those of alkane gases from USA, Russia, Germany, Australia and other countries. Four discrimination criteria are derived from this comparative study: 1) Carbon isotopic composition is generally greater than -30‰ for abiogenic methane and less than -30‰ for biogenic methane; 2) Abiogenic alkane gases have a carbon isotopic reversal trend (δ 13C1> δ 13C2> δ 13C3> δ 13C4) with δ 13C1>-30‰ in general; 3) Gases with R/Ra >0.5 and δ 13C11 δ 13C2>0 are of abiogenic origin; 4) Gases (meth- ane) with CH4/3He≤106 are of abiogenic origin, whereas gases with CH4/3He≥1011 are of biogenic origin.
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Discrimination of abiogenic and biogenic alkane gases |
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| Authors: | JinXing Dai CaiNeng Zou ShuiChang Zhang Jian Li YunYan Ni GuoYi Hu Xia Luo ShiZhen Tao GuangYou Zhu JingKui Mi ZhiSheng Li AnPing Hu Chun Yang QingHua Zhou YanHua Shuai Ying Zhang and ChengHua Ma |
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| Institution: | (1) Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, 100083, China;(2) Department of Earth Sciences, Zhejiang University, Hangzhou, 310027, China;(3) Research Institute of Petroleum Exploration and Development (Langfang Branch), PetroChina, Langfang, 065007, China |
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| Abstract: | We have combined the analytical data of the carbon isotope distribution pattern, R/Ra and CH4/3He values of abiogenic and biogenic (referring to the thermogenic and bacterial or microbial) alkane gases in China with those
of alkane gases from USA, Russia, Germany, Australia and other countries. Four discrimination criteria are derived from this
comparative study: 1) Carbon isotopic composition is generally greater than −30‰ for abiogenic methane and less than −30‰
for biogenic methane; 2) Abiogenic alkane gases have a carbon isotopic reversal trend (δ13C1> δ13C2> δ13C3> δ13C4) with δ13C1> −30‰ in general; 3) Gases with R/Ra >0.5 and δ13C1− δ13C2>0 are of abiogenic origin; 4) Gases (methane) with CH4/3He⩽106 are of abiogenic origin, whereas gases with CH4/3He⩽1011 are of biogenic origin.
Supported by the Science and Technology Project of PetroChina (Grant No. 07-01C-01-07) |
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| Keywords: | biogenic abiogenic alkane gas discrimination carbon isotope helium isotope |
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