SUMMARY OF THE ABIOGENIC ORIGIN THEORY AND THE ABIOGENIC GAS POOLS(FIELDS)
SUMMARY OF THE ABIOGENIC ORIGIN THEORY AND THE ABIOGENIC GAS POOLS(FIELDS)
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DOI：
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发表时间：
2001
影响因子：
1.8
通讯作者：
Dai Jin-xing
中科院分区：
文献类型：
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作者：
Dai Jin-xing
我国的非生物成因理论研究处于世界前沿，大量的科学研究和实践证明，相当大比例的烃类，特别是石油，是有机成因的，但这并不排除有相当大比例的烃类，特别是天然气，是非生物成因或天然气的可能性，有机成因和非生物成因天然气的鉴定如下：（1）非生物成因的CH_4具有大于-30‰的δ~ 13C_1值，2）非生物成因的烷烃气具有负碳同位素序列，3）CH_4/ ~ 3 He值为n×10~5~7; 4）无机成因δ~（13）CCO_ 2值大于-常德气田可能是世界上第一个非生物成因的烃类气田，非生物成因气田的有利位置可按以下标准选择：1）莫霍向上喷流或地幔柱的存在; 2）热流值大于1.3HFU、地温梯度大于3.5℃/100 m的高热或热构造区; 3）R/Ra 1异常，特别是R/Ra 2异常带;4）沿气源附近断裂带存在玄武岩带沿着。
The research on the abiogenic origin theory in China is in the forward position in the world.Extensive scientific research and practi ce have proven that a relatively large percentage of hydrocarbons,especially oil ,are generated organically.However,this does not rule out the possibility that a nother large proportion of hydrocarbons,gas in particular,may be of abiogenic or igin.The identifications of organic and abiogenic gases are as the follows:1) Th e abiogenic origin CH_4 has a δ~13 C_1 value greater than -30‰; 2) The abiogenic alkane gases have negative carbon isotope sequences; 3) CH_4/ ~3He values are n×10~5～7; 4) Abiogenic δ~13 Cco_ 2 values are greater than -8‰.The Changde Gas Field is possible the first abiog enic hydrocarbon gas field in the world.Favorable locations for abiogenic gas fi elds can be selected by following criteria:1) Existance of Moho up-pouring or m antle plume; 2) High thermal or thermal structural area with a heat flow value g reater than 1.3 HFU and a geothermal gradient higher than 3.5℃/100m; 3) Anomalo us R/Ra1,especially R/Ra2 zones;4) Presence basalt rock zone along the faults near the gas resource.