天然气来源的多种途径及其意义

doi:10.11743/ogg20050401

Abstract

Abstract:

Natural gas has multi-origin compared with oil,which can be expressed as multiple genetic types,multiple gas genetic models and multiple occurrences of gas-generating material.Multiple genetic types include organic origin and inorganic origin,single origin and multiple origins,as well as the multistage and continuous gas-generating and evolutional processes from organic matter.Multiple gas genetic models,including mainly various gas-generating mechanisms(such as biochemistry,decarboxylation,polycondensation,pyrolysis,cracking,mechanical chemistry,catalysis and hydrogenation,as well as other chemical reactions) would play different roles in different stages of gas generation,due to the differences in source rock's kerogen and physico-chemical conditions.Multiple occurrences of gas-generating material include the dispersed and accumulative,dissoluble and insoluble organic matters,as well as the water-soluble organic matters that can be used by organisms,CO₂ and the previously formed organic matter.In superimposed basins,accompanying the resubsidence and resedimentation,the better catalytic condition of dispersed and dissoluble organic matter or asphaltene would lower the activation energy for cracking which would be favorable for cracking of kerogen into gaseous hydrocarbons.

Key words: genetic type, genetic model, gas-generating material, dissoluble organic matter

CLC Number:

TE112.1

Liu Wenhui, Zhang Dianwei, Gao Bo, Zheng Jianjing, Wang Xiaofeng. Multiple origins of natural gas and their significance[J]. Oil & Gas Geology, 2005, 26(4): 393-401.

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Multiple origins of natural gas and their significance

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