苏北盆地下第三系烃源岩热演化研究

A STUDY ON THERMAL EVOLUTION OF ORGANIC MATTER IN LOWER TERTIARY SOURCE ROCK OF SUBEI BASIN

李贤庆 包建平 王文军

Li Xianqing Bao Jianping Wang Wenjnn

江汉石油学院测试中心 湖北江陵434102 2. 江苏石油勘探局地质科学研究院 江苏邵伯225261

The Center of Geochemistry, Jianghan Petroleum Insitute 2. Geological Research Institute, Jiangsu Oil Exploration Bureau

本文应用多种光学和化学标志,对苏北盆地下第三系烃源岩有机质热演化特征和阶段进行了研究。研究表明,(1)镜质组反射率Ro是最可靠的演化标志;(2)孢子体和藻类体的荧光变化规律相同,均具有特殊重要的演化意义;(3)随热演化程度的增加,烃源岩可溶有机物成分和结构发生显着变化;(4)苏北盆地有机质热演化阶段划分为阶段Ⅰ和阶段Ⅱ,其界线出现在Ro0.60%～0.65%,并揭示出不同构造单元有机质热演化的不均衡性。

Based on many optical and chemical indexes the characteristics and stages of thermal evolution of organic matter in lower Tertiary source rock of Subei Basin were studied in this paper. The following four conclions could be made from the stydies: (1)the vitrinite reflectance (Ro)is the most reliable scale for thermal evolution, (2)With the same fluorescence alternation Sporinite and alginite,are of special importance in thermal evolution, (3)the component and struture of soluble organic matter in source rock changed greatly as the degree of thermal evolution increase, (4)the thermal evolution of organic matter in Subei Basin could be divided into two stages,i. e. stage Ⅰ and stage Ⅱ, which by 0.60%～0.65% Ro,and moreover, the difference of maturity in different tectonic units was showed.

国家85-102-06-01专题

https://doi.org/10.11781/sysydz199601096