摘要
通过对三塘湖盆地二叠系火成岩与烃源岩热演化关系的研究,分析了火成岩对烃源岩热演化的影响。三塘湖盆地二叠系主要发育的火成岩有玄武岩、安山岩、辉绿岩和凝灰岩等,作为喷出岩的玄武岩、安山岩、凝灰岩,对岩石有机质的热演化基本没有影响或影响很小;只有侵入的辉绿岩可以较长时间在地层中保持一定温度,影响其周围有机质的成熟演化程度。辉绿岩厚度越大,分布范围越广,对烃源岩的影响越大,估算的垂向影响范围应小于200 m。搞清辉绿岩的分布,有助于了解一定范围内烃源岩的热演化特征和生油气能力。
Through the studying of thermal evaluation relationships between igneous rock and source rock, it shows that igneous rock directly affects thermal evaluation of source rock. The main kinds of igneous rock are basalt, andesite, diabase and tuff etc in Permian. The effusive rock such as basalt, andesite and tuff have very little effect on evaluation of organic matter in source rock, and only intrusive rock such as diabase whose temperature can be kept in a long time and influent maturity evaluation of organic matter. The greater the thickness and the extent of diabase, the better effect on source rocks. It is estimated that the influent vertical depth is less than 200 m. If the scope of diabase is clear, it is facilitate to know the thermal evaluation and hydrocarbon-generating capability of source rock.
出处
《石油实验地质》
CAS
CSCD
北大核心
2009年第5期462-465,共4页
Petroleum Geology & Experiment
基金
国家重点基础研究发展计划(973计划)项目(2007CB209503)
关键词
火成岩
热演化
烃源岩
三塘湖盆地
igneous rock
thermal evaluation
source rock
Santanghu Basin
