摘要
本文应用太赫兹时域光谱技术研究了灰色泥岩在半封闭半开放体系下经历不同生烃模拟温度、压力所得干酪根的光学性质,获得了不同干酪根样品在太赫兹波段的吸收谱和折射率,结合样品的镜质体反射率,建立了干酪根在不同演化阶段的生烃模式,分析了干酪根样品在地质升温速率下的自然演化过程及主生烃期,为研究烃源岩的演化及油气生成提供了参考.
Kerogen is a mixture of organic chemical compounds that make up a portion of the organic matter in sedimentary rocks. In this paper terahertz time-domain spectroscopy has been used to probe the evolution process of the kerogen in selected gray mudstone in semi-closed and semi-opened system. The absorption and refractive index spectra at different simulating temperatures （7） indicated the evolution regulation of kerogen which is composed of immature （T〈325℃）, early matured （325℃≤T〈350℃）, middle matured （350℃≤T〈370℃）, later matured （370℃≤T〈400℃） and over matured stages （400℃≤T）. There is certain relationship between kerogen terahertz absorption coefficient and hydrocarbon evolution stages. The immature kerogen has relatively low absorption coefficient, while the absorption coefficient is relatively high in oil and gas generated stages. The present identification based on terahertz time-domain spectroscopy is in agreement with the pyrolysis simulation experiments, suggesting that the terahertz technology can act as a non-destructive, contact-free tool for kerogen hydrocarbon generation ability probing.
出处
《中国科学：物理学、力学、天文学》
CSCD
北大核心
2012年第5期458-463,共6页
Scientia Sinica Physica,Mechanica & Astronomica
基金
北京市自然科学基金资助项目(编号:4122064)
