东濮凹陷北部沙三段泥页岩岩相特征

东濮凹陷北部沙三段泥页岩厚度大、分布广,具有良好的页岩气生烃潜力;但陆相湖盆泥页岩非均质性强,不同岩相生烃能力和储集性能差异较大。为厘清不同岩相的含油气性特征,通过偏光显微镜、X衍射等手段研究泥页岩微观岩相类型,发现东濮凹陷北部沙三段主要发育块状粉砂质泥岩相、纹层状膏质泥岩相、纹层状灰质泥岩相三种典型岩相及多种过渡岩相。通过对比不同泥页岩相地球化学特征、荧光特征、试油试气数据,发现深湖-半深湖环境中的纹层状灰质泥岩相是页岩油气赋存的优势岩相。

The lithofacies characteristics of Es3 in the Northern Dongpu Depression

The Es3 member shale of the northern Dongpu Depression frequently see abnormal gas and oil and gas,showing that the shale oil and gas potential is huge,but the continental lake basin facies are complex, the reservoir properties and hydrocarbon generation ability differences of different lithofacies are big. In order to clarify the control of different lithofacies, the author analyzes the core features of the shale, mineralogical features, fluorescence characteristics of Es3 member to study the micro lithofacies types and characteristics and the favorable facies, finding that the shale layers can be divided into three kinds of typical shale lithofacies: the laminated calcareous shale lithofacies and laminated gypsum shale lithofacies, lump silty shale lithofacies. the kinds have good matching relationship with the deposition facies, by comparing the geochemical characteristics, the fluorescence characteristics, try oil gas data shows that the the laminated calcareous shale lithofacies in the deep lake - half deep lake environment is the favorable facies of shale oil and gas occurrence.