柴达木盆地第四系脂肪酸分布特征与生气潜力的关系

doi:10.11743/ogg20050614

Abstract

Abstract:

Fatty acids(methyl ester)of dissoluble organic matter in Quaternary mudstone samples obtained from 540-1 490 m interval in Sebei area of Qaidam basin are analyzed through GC-MS.Even-odd predominance index of normal fatty acids varies greatly in 1 200-1 381 m interval.It is caused by various factors,of which the input of organic materials and bacterial action are dominant.In intervals of 796-810.8 m,1 188.24-1 210 m and 1 291.54-1 300.74 m,several biomarker indexes of fatty acids,such as content of fatty acids,even-odd predominance index and component dispersancy index,are at their valleys,as the major organic matters input in these intervals are of aquatic organism type,which are easy to be degraded by bacteria.All these indicate that source rocks dominated by indigenously sourced organic matter type have relatively high gas generating potential.Abundance of unsaturated acid and isomeric acid are discovered in 1 188.24-1 210 m interval,indicating that the geochemical environment and type of gas source rock in this interval are suitable for living and growth of bacteria.This specific fatty acid distribution might indicate high quality gas source rocks.

Key words: fatty acid, bacteria, biogas, Quaternary, Qaidam basin

CLC Number:

TE125.2

Kang Yan, Wang Wanchun, Zhang Daowei, Ren Junhu. Relationship between distribution of fatty acids and gas-generating potential in Quaternary in Qaidam basin[J]. Oil & Gas Geology, 2005, 26(6): 778-785.

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Relationship between distribution of fatty acids and gas-generating potential in Quaternary in Qaidam basin

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