摘要
碳酸盐岩排烃问题一直是地球化学界争论和研究的焦点问题之一,也是模拟实验中的一个难点。通过对碳酸盐岩与泥岩生排烃过程中的产物和排烃动力的定量模拟实验研究,确定了碳酸盐岩烃源岩的有效排烃方式,讨论了碳酸盐岩在排烃临界条件下的有机质丰度的取值范围。实验结果表明,碳酸盐岩排烃模式与泥岩的模式不同,有其特殊的排烃方式;在碳酸盐岩排烃过程中生烃增压是主要的排烃驱动力;有机质丰度下限值不是一个定值,正好相反,随着热演化温度的不同,有机质丰度下限值也不尽相同。根据碳酸盐岩特殊的排烃模式,源岩有机碳含量0.4%～0.5%可能是满足碳酸盐岩源岩有效排烃条件的临界有机质丰度范围值。
The problem on the hydrocarbon expulsion of carbonate source rock has been the focal point that the geochemistry academia has disputed and studied all the time, and it is the difficult point in the simulation experiment too. According to the quantitative simulation experiment on production and the dynamics of hydrocarbon expulsion, the effective mode of hydrocarbon expulsion of carbonate source rocks is confirmed, and threshold of the organic matter abundance is discussed in the critical condition of hydrocarbon effective expulsion of carbonate source rocks. The experimental results indicate that the mode of hydrocarbon expulsion of carbonate source rocks is different from that of the argillite, and has its own special characteristics. It is the hydrocarbon-generating pressurization that is the main driving force of hydrocarbon expulsion of carbonate source rocks. Threshold of the organic matter abundance is not a constant and is a variable with the variety of thermal evolution temperature. According to the special mode of hydrocarbon expulsion of carbonate source rocks, it is concluded that the critical conditions of hydrocarbon effective expulsion of carbonate source rocks may be 0.4% - 0. 5% TOC.
出处
《地球化学》
CAS
CSCD
北大核心
2006年第2期167-173,共7页
Geochimica
基金
国家重点基础研究发展计划项目(19990433)
关键词
碳酸盐岩
排烃模式
生烃增压
有机质丰度下限
模拟实验
carbonate rocks
hydrocarbon expulsion mode
hydrocarbon-generating pressurization
threshold of the organic matter abundance
simulation experiment
作者简介
赵喆（1976-），男，博士研究生，地质资源与地质工程专业，主要从事油藏地球化学、油气运聚与成藏研究工作。通讯作者：ZHAO Zhe，E-mail：zhaozhe76@163．com，Tel：＋86-10-89734548
