天然气地球化学

塔里木盆地煤岩在不同介质条件下热模拟实验中烷烃系列有机地球化学特征

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  • [1]中国石油勘探开发研究院;[2]中国石化石油勘探开发研究院;[3] 中国科学院地质与地球物理研究所兰州油气资源研究中心; 甘肃兰州;
刘全有(1975-),男,山西朔州人,博士后,主要从事石油天然气地质学与地球化学研究.E-mail:qyouliu@sina.com.

网络出版日期: 2006-06-20

ORGANIC GEOCHEMISTRY OF N-ALKANES FROM TARIM COAL WITH DIFFERENT MATERIALS IN PYROLYSIS UNDER CLOSED SYSTEM

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  • 1.Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083,China;
    2.Exploration & Production Research Institute, SINOPEC, Beijing 100083, China3.Lanzhou Research Center of Oil & Gas Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences, Lanzhou 730000, China

Online published: 2006-06-20

摘要

对塔里木盆地侏罗系煤岩在不同介质下的热模拟实验和正构烷烃系列色质测试分析结果表明,在400℃前后煤岩成烃机理不同。结合对峰型、ΣC21-/ΣC22+值、OEP指数和P r/Ph值等地球化学参数的研究,指出了不同热演化阶段的成烃机理:在低温阶段(<350℃)煤岩主要是裂隙、晶格间吸附烃和结构边缘烃的排出;在350~400℃之间,脱甲基及链断裂效应使得煤岩排烃进入高峰期;在高演化阶段(≥450℃),大量内部结构烃发生断裂重排,550℃以上温度达到第二个热降解高峰,产出烃发生脱甲基、链断裂和开环效应。模拟实验还表明,OEP指数变化较大,其每次变化都伴随一次生烃高峰;P r/Ph值随着热演化程度呈降低趋势;有水、伊利石和蒙脱石存在时,会改变煤岩在热演化过程中高碳数烃的热降解速率,有利于液态烃的形成。

本文引用格式

刘全有;刘文汇;孟仟祥; . 塔里木盆地煤岩在不同介质条件下热模拟实验中烷烃系列有机地球化学特征[J]. 天然气地球科学, 2006 , 17(3) : 313 -318 . DOI: 10.11764/j.issn.1672-1926.2006.03.313

Abstract

The Jurassic coals from Tarim basin with different minerals and water were subjected to closed system pyrolysis,in sealed steel tubes,under isothermal temperature conditions,ranging from 250 to 550°C at temperature intervals of 50°C(pyrolysis time 72 hours).The distribution of n-alkanes extracted from pyrolysate products illustrates the difference of hydrocarbon origins before and after 400℃.Together with these geochemical features,such as peak types,ΣC 21-)/ΣC_(22+),OEP and Pr/Ph ratios.

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