中国典型海相富有机质页岩的生气机理

发布时间：2018-02-04 10:11

本文关键词： 富有机质页岩生烃动力学排烃作用干酪根沥青地球化学　出处：《地球科学》2017年07期 　论文类型：期刊论文

【摘要】：目前页岩生烃的评价体系主要停留在静态条件下,忽略了成烃的动态过程,不能正确评价页岩原始的生烃潜力.采用生烃动力学模拟实验方法,分别对一个相对低成熟的典型海相富有机质页岩及其干酪根样品开展封闭体系和半开放体系下的人工熟化,并对熟化后的两个系列样品进行黄金管生气动力学模拟实验.对裂解产物中气态烃化合物、轻烃类化合物以及碳同位素开展了定量分析,结果表明,甲烷生成过程被划分为4个阶段,即生油(小于1.0%EasyRo)、凝析油生成(1.0%~1.5%EasyRo)、湿气生成(1.5%~2.2%EasyRo)和干气生成阶段(大于2.2%EasyRo);页岩中甲烷的最大产率主要来自干酪根的初次裂解(占22.7%)、可排沥青(占57.6%)和残余沥青(占19.6%)的二次裂解;经过早期排烃作用的页岩样品仍有大量的可溶沥青,在高-过成熟阶段其可以与干酪根、不可溶沥青相互作用,成为晚期主要的页岩生气母质.
[Abstract]:At present, the evaluation system of shale hydrocarbon generation mainly stays in static condition, neglects the dynamic process of hydrocarbon generation, and can not correctly evaluate the original hydrocarbon generation potential of shale. The hydrocarbon-generating kinetic simulation experiment method is adopted. Artificial maturation of a relatively immature typical marine organic rich shale and its kerogen samples were carried out in the closed system and semi-open system respectively. The gas kinetic simulation experiments of two series of aged samples were carried out. The quantitative analysis of gaseous hydrocarbon compounds, light hydrocarbon compounds and carbon isotopes in pyrolysis products was carried out, and the results showed that. The methane generation process is divided into four stages: oil generation (less than 1.0 syRo, condensate oil 1.0 ~ 1.5 syRo). Wet gas formation (1.5 ~ 2.2 syRo) and dry gas generation stage (> 2.2 syRo); The maximum yield of methane in shale mainly comes from the primary cracking of kerogen (22.7m), the secondary cracking of removable asphalt (57.6g) and residual asphalt (19.6g). After early hydrocarbon expulsion, shale samples still have a large number of soluble bitumen, which can interact with kerogen and insoluble asphalt in the high-over-maturation stage, and become the main source material of shale gas in the late stage.
【作者单位】：中国科学院广州地球化学研究所有机地球化学国家重点实验室;中国科学院大学;
【基金】：国家基础地质调查项目(No.12120114046801) 国家自然科学基金项目(No.41672126)
【分类号】：P618.13
【正文快照】： 页岩气作为非常规油气资源,其勘探开发始于美国(Curtis,2002).随后,全球掀起了轰轰烈烈的“页岩气革命”,多个国家开展了页岩气前期评价和勘探开发试验.我国在烃源岩特征和形成机理方面研究相对较多(丁修建等,2016;李松峰等,2016),近几年关于页岩气资源潜力评价和勘探开发上也

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