低熟泥灰岩、钙质泥岩干酪根脂肪酸的分布特征及赋存形式

doi:10.11743/ogg20050607

Abstract

Abstract:

Three acid series,including straight chain monoacid,straight chain binary acid and aromatic acid,have been detected in the kerogen of low mature Tertiary source rocks with low organic carbon content in Qaidam basin.Relative abundance of straight chain monoacid is the highest among these three acid series,and C_16:0 acid occurs as the main peak(saturated fatty acid),with obvious even carbon number predominance.The volume of kerogen fatty acid is over three times that of enhanced kerogen fatty acid,and the former has much larger relative abundance of straight chain binary acid than the latter.In addition,the volume of fatty acid that enrich in carbonate crystals of source rocks in the form of calcium(magnesium)fatty acid salt and fatty acid is far greater than that occur in kerogen network.When these carbonate crystals were decomposed at high temperature(and at complex geologic conditions),the fatty acid salt and fatty acid might be cracked into small molecular hydrocarbon,i.e.,gaseous hydrocarbon.The sulfur in deposited organic matters in the study area occur as pentabasic,hexabasic and octatomic ring stable states,and would make contribution to the enrichment and existence of fatty acid(salt)due to its strong electron negativity.

Key words: carbonate crystal, fatty acid(salt), kerogen, hydrocarbon generation, Tertiary, Qaidam basin

CLC Number:

TE125.2

Meng Qianxiang, Zheng Jianjing, Fang Xuan, Sun Minzhuo. Distribution and occurrence of kerogen fatty acids in low mature marl and calcareous mudstone[J]. Oil & Gas Geology, 2005, 26(6): 736-741.

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Distribution and occurrence of kerogen fatty acids in low mature marl and calcareous mudstone

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