热模拟实验甲烷碳同位素演化特征——兼析实验与自然条件下δ13C1-Ro关系的差异

薛罗; 徐思煌; 袁彩萍; 刘晓霞; 李松峰

doi:10.11781/sysydz201206617

热模拟实验甲烷碳同位素演化特征——兼析实验与自然条件下δ¹³C₁-R_o关系的差异

doi: 10.11781/sysydz201206617

中国地质大学(武汉)构造与油气资源教育部重点实验室, 武汉, 430074

基金项目: 国家科技重大专项子课题(2011ZX05023-001-015)资助

详细信息

作者简介:
薛罗(1988- ),男,在读硕士,从事油气地球化学及资源评价方面的研究工作.E-mail:xueluo5555@126.com

中图分类号: TE121.3⁺4
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出版历程
- 收稿日期: 2012-06-11
- 修回日期: 2012-09-25
- 刊出日期: 2012-11-28

Evolution characteristics of methane stable carbon isotope in thermal simulation experiment:Discussion of δ¹³C₁-R_o relationship under experimental and natural conditions

Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, Hubei 430074, China

摘要

摘要: 对珠一坳陷古近系5个泥岩样品进行了热模拟实验,测定了热模拟甲烷碳稳定同位素值。研究发现,热模拟条件下甲烷碳稳定同位素在R_o为1.2%～1.3%之前是随着R_o的增大而减小,之后是随着R_o的增大而增大。用甲烷的碳同位素动力学模型来分析这种"先减小后增大"的规律,认为这是由¹³C甲烷(重甲烷)与¹²C甲烷(轻甲烷)的活化能差异造成的。对比发现,实验条件下与自然条件下甲烷碳稳定同位素与成熟度的关系有明显的差异性,认为这是由"成烃后作用"造成的,其中大规模气体运移将导致碳同位素分馏效果弱化。这对于气田的勘探有较好的指导意义,甲烷碳同位素重,说明气源岩成熟度高、运移体积规模大、大气藏勘探前景较好。
- 甲烷碳同位素 /
- 热模拟实验 /
- 动力学模型 /
- 活化能 /
- 体积效应
Abstract: By means of thermal simulation experiment,5 mudstone samples from Palaeogene of the Zhu Ⅰ Depre-ssion have been tested.The studies of methane stable carbon isotope have shown that when R_o is below 1.2%-1.3%,methane stable carbon isotope decreases as R_o increases.When R_o is over 1.2%-1.3%,methane stable carbon isotope increases as R_o increases.The changing principle may be explained by the differences of activation energy between ¹³C methane(heavy methane)and ¹²C methane(light methane).Under experimental and natural conditions,the relationship between methane stable carbon isotope and R_o are different,which might be the results of "effects after hydrocarbon generation".Due to the effects,massive gas migration leads to the weaken-ing of carbon isotope fractionation.The studies may guide gas field exploration.Heavy methane carbon isotope indicates high-mature gas source rocks,large-scale migration and good prospects for gas exploration.
- methane carbon isotope /
- thermal simulation experiment /
- kinetic model /
- activation energy /
- volume effect

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