收稿日期: 2014-10-31
修回日期: 2015-02-02
网络出版日期: 2015-06-10
基金资助
中国石油天然气股份有限公司科学研究与技术开发项目(编号:2012E-2603-06)；国家重点基础研究计划(“973”)课题(编号:2012CB214702)；国土资源部公益性行业科研专项基金项目(编号:201311022)；教育部高等学校博士学科点基金项目(编号:20110023110017)联合资助.
Comparison of the Characteristics of Hydrocarbons Generated by TypeⅠ of Organic Matter Using Two Different Experiment Methods in Gold Tube System
Received date: 2014-10-31
Revised date: 2015-02-02
Online published: 2015-06-10
对2个Ⅰ型有机质干酪根样品在黄金管体系中采用常规连续加热和分步阶段加热的方法进行了生烃模拟实验。通过对2种实验条件下生成原油和气体的分析对比、实验结果的地质推演，得到如下结论:①黄金管体系中进行分步加热模拟方法，不但可以确定不同演化阶段有机质的生油量，同时也可以确定在不同演化阶段的生气量；②源岩生油和其中未排出的残留油的裂解不是2个截然分开的过程，在生油窗的后期，源岩在生油的同时会有一部分在生油窗早期生成的原油发生裂解，至生油窗结束时，已裂解的原油占总生油量的8%~10%；③Ⅰ型有机质热解生成气体较少，一般不超过130mL/g TOC，其生气结束的成熟度界限为RO=3.8%；④在干酪根热解气与原油裂解气共存的成熟度范围(RO=1.5%~2.5%)，干酪根热解甲烷碳同位素值高于原油裂解甲烷碳同位素值，干酪根热解生气要比原油裂解气碳同位素值至少高0‰~5‰。且在此范围内成熟度越高，2种不同来源甲烷的碳同位素值差值越大。
孙萌萌，米敬奎，冯子辉，李贤庆，张居和，刘洋 . 黄金管体系中Ⅰ型有机质2种模拟方法生烃特征对比[J]. 天然气地球科学, 2015 , 26(6) : 1156 -1164 . DOI: 10.11764/j.issn.1672-1926.2015.06.1156
Two types of hydrocarbon generation simulation experiments for two kerogen samples with typeⅠ organic matter were conducted in gold tube by continuously heating and step by step heating methods.The amount of oil and gas,and the carbon isotope of generated gas were quantified and analyzed.Then,the results of experiments were deduced to geological setting.Finally,the following knowledge about hydrocarbon generation from organic matter was concluded.(1)Both the oil generated from organic matter and gas directly generated by organic matter thermal decomposition could be gained by step by step heating methods.(2)The processes of oil generation from organic matter and cracking of oil resided in source rock overlap in the later of oil window.The cracked oil takes up 9%-10% of total oil generated by organic matter at the end of oil window.(3)The volume of accompanied gas generated directly by thermal degradation of type Ⅰorganic matter is not more than 130mL/g TOC in general.The thermal upper limits of gas generation for type Ⅰ organic matter is 3.8 %(RO).(4)The carbon isotope of methane generated by thermal degradation of type Ⅰ organic matter is heavier than that of cracking gas in the maturity range(RO=1.5%-2.5%)where primary gas from thermal degradation of organic matter and cracking gas co-exist.Their difference ranges from 0‰ to 5‰,and larger difference accompanied by higher maturity for the range from 1.5%(RO) to 2.5%(RO).
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