欧利坨子中北段火山岩与浊积岩岩相研究

Study on volcanic and turbidite facies in the mid-north section of Oulituozi

运用测井方法对欧利坨子地区火山岩岩性进行了识别,同时利用粒度分析关系图对砂岩特征进行了研究,提出了浊积岩与火山岩二者之间互补沉积的接触关系,研究还认为该区浊积岩与火山岩属于断陷湖盆扩张期的产物,建立了陡坡浊积扇沉积与火山岩喷发模式,该模式在实践应用中得到了验证,对于指导东部凹陷岩性勘探具有重要的意义。

This paper identifies volcanic lithology in Oulituozi area with logging method,studies sandstone characteristics with grain-size analysis map,and proposes a compensated sedimentation relationship between turbidite and volcanic rocks.The study also indicates that the turbidite and volcanic rocks in this area are results of faulted lake basin extension.A model of turbidite fan deposit and volcanic eruption on steep slope is set up and verified in practical application.This may guide lithologic exploration in the eastern sag of Liaohe depression.