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Application of the Degration Degree of Organic Matter  to Evaluating the Biogas Source Rock

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  • 1. Langfang Branch of Research Institute of Petroleum Exploration and Development,PetroChina,Langfang 065007, China; 2. Research Institute of Petroleum Exploration and Development, PetroChina DaqingOil Company, Daqing 163712, China; 3. China University of Geosciences (Beijing), Beijing 100083, China.

Received date: 2009-05-18

  Revised date: 2009-09-09

  Online published: 2009-12-10

Abstract

]The Degration degree of organic matter during the anaerobic period of bacteria can be used as a method for evaluating the biogas source rock. The organic geochemical and microscope analyses for 20 samples in the north of Sonliao basin indicate that the degree of degration of organic matter is not correlated to the maturity of organic matter, while it is positively correlated to the type of organic matter. Degree of degration of organic matter is up to 80% for the type I biogas source rock but is always less than 60% for the type Ⅲ biogas source rock. The degration degree of organic matter and the production of biogas (it can be used to calculate the conversion ratio of biogas) of original algea before and after biogas simulation showed that the degree of degration of organic matter is positively correlated to the conversion ratio of biogas. When the degree of degration is up to 80%, the conversion ratio of biogas is 40%~50% and when the degree of degration is less than 10%, the conversion ratio of biogas is only 7%. The TOC of immature biogas source rock can be calculated approximately by the relationship between the degree of degration of organic matter and the conversion ratio of biogas.

Cite this article

LUO Xia,WANG Xue,LI Jian,FANG Wei,ZHANG Ying,FENG Zi-hui,WU Da-mao,LIU Wei . Application of the Degration Degree of Organic Matter  to Evaluating the Biogas Source Rock[J]. Natural Gas Geoscience, 2009 , 20(6) : 945 -950 . DOI: 10.11764/j.issn.1672-1926.2009.06.945

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