东濮凹陷咸化湖盆优质烃源岩的发育特征及意义

采用岩石学及地球化学方法测试分析东濮凹陷咸化湖盆烃源岩,确定了咸化湖盆页岩及油页岩为优质烃源岩。其具有两层结构,主要由富含有机质的纹层和夹有黄铁矿的钙质纹层构成;生物标志化合物普遍具有奥利烷丰度低,伽马蜡烷丰度高,而C_(27),C_(30)甾烷相对丰富,姥鲛烷与植烷质量分数之比(Pr/Ph)低等特征,反映出强还原咸水沉积环境,有机质主要来自于水生生物。高生产力及盐水分层造成的强还原环境是造成东濮凹陷咸化湖盆优质烃源岩的形成与发育的主要原因。富集生烃灶将是效益勘探形势下的重点研究方向。

Development characteristics and significance of high quality source rocks of salty lake in Dongpu Depression

Analyzing the source rocks of the salty lake basin in Dongpu Depression by petrological and geochemical methods,the shale and oil shale of the salty lake basin were identified as high quality hydrocarbon source rocks.The source rocks have a twostory structure consisting essentially of organic-rich layers and calcareous layers with pyrite;biomarker compounds generally have low valerine mass fraction,high gamma fraction content,and relatively rich C27,C30 steranes,low Pr/Ph characteristics,reflecting the strong reduction of salt water deposition environment,organic matter mainly from aquatic organisms.Strong reduction environment caused by high productivity and brine stratification is the main reason for the formation and development of high quality hydrocarbon source rocks in the salty lake basin in Dongpu Depression.Enriching hydrocarbon generation foci will be the focus of the exploration situation under the benefit research direction.