PY/MIT/HS-SPME技术在深层-超深层烃源岩轻烃定量及单体同位素分析中的应用研究

轻烃馏分是深层烃源岩重要组成部分，其参数是进行油源对比、油气资源评价至关重要的指标。我们常用的烃源岩组分提取方法多为索式提取，提取过程中轻烃组分均损失殆尽，从而无法应用轻烃生标进行油源对比。因此，寻找新的提取方法迫在眉睫。我们前期工作观察到，热解析联合分子印迹顶空固相微萃取技术(PY/MIT/HS-SPME)不仅获得了C8-C13甲基萘、咔唑类轻烃生标，而且获得了与索式提取组分中相一致的大分子量的生标，其甾萜烷分布特征非常相似。因此PY/MIT/HS-SPME技术可能是提高深层-超深层烃源岩轻烃组分及同位素分析准确度的有效方法。本项目拟对萃取机理及富集条件的优化研究，确定最佳方案，并对不同母质来源、不同演化程度的深层烃源岩进行系统研究，总结PY/MIT/HS-SPME技术提取烃源岩轻烃生标与索式提取生标的分布特征及同位素关系，建立一套新的深层-超深层烃源岩轻烃组分油源精细对比新方法。

Light hydrocarbon fraction is an important part of deep hydrocarbon source rock, and its parameters are important indexes for oil source comparison and evaluation of oil and gas resources. Most of the commonly methods used to extract the hydrocarbon source rock are cable extraction, and all the light hydrocarbon components are lost in the extraction process, so the light hydrocarbon biomarkets cannot be used for oil source comparison. Therefore, it is urgent to find a new extraction method. In previous work, we observed the thermal desorption joint molecularly imprinted Headspace Solid-phase Microextraction (PY/MIT/HS-SPME) techniques extracted hydrocarbon source rocks not only won the C8 - C13 methyl naphthalene light hydrocarbon components, carbazole biomarker compounds, and get the same type of consistent big molecular weight biomarkets, the pristane、phytane、steranes and terpane distribution characteristics are very similar. Therefore, thermal desorption combined with molecularly imprinted headspace solid phase microextraction may be an effective method to improve the accuracy of light hydrocarbon composition and isotope analysis of source rocks. This project intends to study the optimization of thermal desorption conditions, solid-phase microextraction mechanism and extraction and enrichment conditions, determine the best scheme, and conduct a systematic study on deep source rocks with different parent material sources and different evolution levels. In addition, this paper summarizes the distribution characteristics and isotopic relations of light hydrocarbon and cable extraction in the pyrolysis and molecularly imprinted solid phase microextraction of source rocks, and establishes a new method for fine oil source comparison of light hydrocarbon components in deep-superdeep source rocks.