煤成气轻烃组分和碳同位素分布特征与天然气勘探

doi:10.7623/syxb201001007

石油学报 ›› 2010, Vol. 31 ›› Issue (1): 42-48.DOI: 10.7623/syxb201001007

煤成气轻烃组分和碳同位素分布特征与天然气勘探

胡国艺 1,2 李谨 3 李志生 3 王淑英 3

1中国石油勘探开发研究院北京 100083； 2 中国石油天然气股份有限公司油气地球化学重点实验室北京 100083； 3 中国石油勘探开发研究院廊坊分院河北廊坊 065007

收稿日期:2009-02-12 修回日期:2009-06-17 出版日期:2010-01-25 发布日期:2010-05-21
通讯作者: 胡国艺

Composition and carbon isotopic distribution characteristics of light hydrocarbon in coal-derived gas and natural gas exploration

HU Guoyi 1,2 LI Jin 3 Li Zhisheng 3 WANG Shuying 3

Received:2009-02-12 Revised:2009-06-17 Online:2010-01-25 Published:2010-05-21
Contact: HU Guoyi

摘要/Abstract

摘要：

采用烃源岩热模拟实验和轻烃单体烃碳同位素分析方法,对煤热解轻烃生成模式及煤系烃源岩热解轻烃碳同位素组成特征的研究表明，在成熟度 R_o 值为1.1%～1.7%时,煤热解轻烃大量生成;当 R_o 值大于1.7%时，以芳烃生成为主。煤热解轻烃中苯和甲苯碳同位素均较重，苯的碳同位素值平均为－22.2‰，甲苯的碳同位素值平均为－22.1‰，与母源有机质干酪根碳同位素值非常接近，具有良好的碳同位素继承效应。对塔里木、准噶尔、鄂尔多斯、四川和松辽等盆地煤成气轻烃组分和碳同位素分析表明，煤成气具有甲基环己烷分布优势，在甲基环己烷、二甲基环戊烷和正庚烷相对组成中，173个煤成气样品中有92%的样品甲基环己烷相对含量大于50%；煤成气轻烃中苯、甲苯、环己烷和甲基环己烷碳同位素重，碳同位素值平均分别为－20.9‰、－20.4‰、－21.9‰和－22.0‰。应用轻烃组成变化对苏里格煤成气大气田天然气运移方向进行的研究表明，在气藏形成时期，天然气运移方向为由南向北。

关键词: 煤成气, 轻烃, 苯, 甲苯, 碳同位素, 天然气运移方向, 苏里格气田

Abstract:

The thermal simulation test of light hydrocarbon and the individual light hydrocarbon carbon isotope analysis method were used to investigate the generation model and carbon isotopic composition of light hydrocarbon obtained from coal. The results showed that a large amount of light hydrocarbon was generated from coal when the maturity R_o ranged from 1.1% to 1.7%, and the aromatic amount was the most while the maturity R_o was over 1.7%. The carbon isotope values of benzene and toluene in coal pyrolysed gas are comparatively greater. The δ¹³C value of benzene was from －25.2‰ to －17.6‰, and the average value was －22.2‰. The δ¹³C value of toluene varied from －25.3‰ to －17.2‰, and the average value was －22.1‰. All of these values are quite similar to the carbon isotopes of kerogens in the source rocks, which shows a good inherit effect of carbon isotopic between kerogen and aromatics. The light hydrocarbon composition characteristics of coal-derived gas and carbon isotope analysis showed that the relative content of methylcyclohexane was more than 50% in the C₇ light hydrocarbons of methylcyclohexane, dimethylcyclopentane and normal heptane in about 92% of 173 gas samples. The carbon isotope values of benzene, toluene, cyclohexane and methylcyclohexane in natural gas were greater. The δ¹³C value of benzene ranged from －24.4‰ to －16.2‰, and the average value was －20.9‰. The δ¹³C value of toluene varied from －24.1‰ to －16.9‰, and the average value was －20.4‰. The δ¹³C value of cyclohexane ranged from －25.8‰ to －16.2‰, and the average value was －21.9‰. The δ¹³C value of methylcyclohexane varied from －25.9‰ to －18.7‰, and the average value was －22.0‰. The natural gas migration direction analyzed by means of light hydrocarbon composition change showed that the hydrocarbons migrated mainly from the south to north in the forming stage of gas reservoir in Sulige Giant Gasfield.

Key words: coal-derived gas, light hydrocarbon, benzene, toluene, carbon isotope, natural gas migration direction, Sulige Gasfield

胡国艺李谨李志生王淑英. 煤成气轻烃组分和碳同位素分布特征与天然气勘探[J]. 石油学报, 2010, 31(1): 42-48.

HU Guoyi;LI Jin Li Zhisheng WANG Shuying. Composition and carbon isotopic distribution characteristics of light hydrocarbon in coal-derived gas and natural gas exploration[J]. Editorial office of ACTA PETROLEI SINICA, 2010, 31(1): 42-48.

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煤成气轻烃组分和碳同位素分布特征与天然气勘探

Composition and carbon isotopic distribution characteristics of light hydrocarbon in coal-derived gas and natural gas exploration

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