三塘湖盆地二叠系火成岩分布及其对烃源岩热演化的影响

PERMIAN IGNEOUS ROCK DISTRIBUTION AND ITS INFLUENCE TO THE THERMAL EVOLUTION OF SOURCE ROCK IN SANTANGHU BASIN

高岗 梁浩 沈霞 焦立新 李华明

Gao Gang Liang Hao Shen Xia Jiao Lixin Li Huaming

中国石油大学, 油气资源与探测国家重点实验室, 北京, 102249 2. 中国石油, 吐哈油田分公司勘探开发研究院, 新疆, 哈密, 839000 3. 中国石油吉林油田分公司, 勘探开发研究院, 吉林, 松原, 138000

State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China 2. Research Institute of Exploration and Development, Xinjiang Tuha Oilfield Company, Hami, Xinjiang 839000, China 3. Research Institute of Exploration and Development, Jilin Oilfield Company, Songyuan Jilin 138000, China

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.

国家重点基础研究发展计划(973计划)项目(2007CB209503)

https://doi.org/10.11781/sysydz200905462