Experimental research on the potential of sapropelic kerogen cracking gas and discrimination of oil cracking gas

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  • 1.Langfang Branch,Reasearch Institute of Petroleum Exploration and Development,PetroChina,Langfang 065007,China;
    2.Laboratory of Gas Reservoir Formation and development,CNPC,Langfang 065007,China

Received date: 2015-07-01

  Revised date: 2015-10-22

  Online published: 2019-09-19

Abstract

It is the consensus that sapropelic matter generated oil at first and then the oil cracked into gas in the process of hydrocarbon-generation evolution,however,there is still dispute that how much gas is generated by kerogen directly and how to identify it.The experimental samples are low mature sapropelic shale in Xiamaling Formation in North China,the experimental devices are high temperature-pressure gold tube system and normal autoclave thermal simulation,gas generation simulation experiments of original kerogen,residual kerogen and oil from the same shale are developed.It concluded that:(1)the gas generated from kerogen directly accounts for about 20% after the oil generation peak period,The main gas generating stage is from 422-566℃(RO=1.3%-2.5%),and the amount takes up 85.5%.(2)the value of Ln(C1/C2) and Ln(C2/C3) increases with the growth of evolution degree for both kerogencracking gas and oil cracking gas.However,at over mature period,the value of Ln(C2/C3) increases for the kerogencracking gas while the value for oil cracking gas keeps stable,and the value of ln(C1/C2) at low heating rateislarger than that at high heating rate.(3)the new oil cracking gas discrimination chart is established consideringevolution degree.The gas from Sinianand Cambrian in Sichuan Basin is oil cracking gas from the above understanding.The research resultsreveal that not kerogen cracking gas but oil cracking gas is the main target at high evolution degree where sapropelic matter developed,and these can provide important evidence for the determination of whole process hydrocarbon-generation evolutionlocus curve of organic matter.

Cite this article

Xie Zeng-ye, Li Zhi-sheng, Wei Guo-qi, Li Jian, Wang Dong-liang, Wang Zhi-hong, Dong Cai-yuan . Experimental research on the potential of sapropelic kerogen cracking gas and discrimination of oil cracking gas[J]. Natural Gas Geoscience, 2016 , 27(6) : 1057 -1066 . DOI: 10.11764/j.issn.1672-1926.2016.06.1057

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