生油岩与火成岩的相互作用研究初探—有机酸对火成岩的蚀变及过渡金属对有机质演化的催化作用

在发育火成岩的生油层中 ,微生物和热解作用导致生油岩有机质形成有机酸 ,这些有机酸对火山矿物中的金属元素是一种有效的溶剂和迁移介质 ,特别是能促使其中的过渡金属活化和溶解。这样造成与火成岩共存的生油岩内过渡金属含量显著增加 ,一些过渡金属是有机质成烃演化良好的催化剂。同时火山和热液活动还能向生油层提供过渡金属元素 ,从而使与火成岩共生的生油岩油气生成量大大提高。

INTERACTION BETWEEN SOURCE ROCKS AND IGNEOUS ROCKS— A PRELIMINARY INVESTIGATION OF DISSOLUTION OF IGNEOUS ROCKS BY ORGANIC ACIDS AND CATALYSIS OF TRANSITION METALS IN THE GENERATION OF HYDROCARBONS IN THE SOURCE ROCKS

In the source rocks interbedded with volcanic rocks, organic acids were an active solvent in corrosion of transition metals from igneous minerals, and a fluid carrying the metals into the source rocks. The organic acids were generated by germs and thermal degradation of sedimentary organic matter during diagenesis and thermal alteration stages. Volcanoes and thermal fluids also produced and provided transition metals to the source rocks. Therefore, the contents of transition metals in the source rocks increased obviously. The transition metals did great catalysis in hydrocarbon generation from organic matter in the experiments by Mango et al.The authors believed that the transition metals also made catalysis to hydrocarbon generation in sub-surface source rocks.;