BIOGAS FORMING MECHANISM AND GEOCHEMICAL CHARACTERISTICS OF ITS SOURCE ROCK
Received date: 2003-05-27
Revised date: 2003-09-04
Online published: 2003-10-20
Biogas has been formed in the immature and/or lowe-mature stage of organic matter, which generating process is very complex and divers, mainly including two ways of H-2+CO-2 biochemical reduce and the acetate fermentation. According to biogas forming machine, the geochemical characteristics of its source rocks are relation to the action of bacteria-generating methane.;The source materirals mainly are mixed type. The content of organic carbon is low, and I {HC}+IH>100 mg/g·TOC, but also IO>100 mg/g·TOC. The abundance of non-hydrocarbon is higher in chloroform extracts. The distributional pattern of n-alkane is similar to that of fatty acid compound. The phytane, terpane and sterane compounds have been characterized by bacterial source and other source transformed by bacteria. Some terpane compositions of indicating environment suggest that organic matter has been deposited in strong reducing conditions.
Key words： Biogas; Gas source rock; Geochemistry; Qaidam basin.
DING An-na,WANG Ming-ming, LI Ben-liang, ZHANG Dao-wei, PENG Xiu-li,HUI Rong-y . BIOGAS FORMING MECHANISM AND GEOCHEMICAL CHARACTERISTICS OF ITS SOURCE ROCK[J]. Natural Gas Geoscience, 2003 , 14(5) : 402 -407 . DOI: 10.11764/j.issn.1672-1926.2003.05.402
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