济阳坳陷东部新近系馆陶组下段辫状河三角洲沉积研究

根据水下沉积的标志 (泥岩颜色和富存的古生物化石 )和湖泊水流作用的标志 (岩性和结构、沉积构造、粒度分析、岩石的成分与结构成熟度、岩心的沉积相序以及砂体的平面形态等 ) ,证实了济阳坳陷新近系馆陶组下段为辫状河三角洲 ,而不是陆上河流或冲积扇沉积。通过解剖济阳坳陷东部某油田馆陶组的沉积序列发现 ,在馆下段沉积时期 ,辫状河三角洲发育水下辫状河道、河口砂坝以及前缘席状砂等微相 ,这为渤海湾盆地新近纪古湖泊研究和济阳坳陷新近系油气勘探提供了新的思路

Braided river delta sedimentary facies of lower Guantao Formation of the Neogene in easten Jiyang Depression

Some facies marks of submerged sedimentary (such as shale color and palaeobiological fossil) and reworking marks of lake current (such as lithology and texture, sedimentary structure, grain size analysis, litholic composition and its maturity, facies sequence in the cores, plane pattern of sand body) have been found in the lower Guantao Formation of the Neogene in the eastern Jiyang Depression. It is proved that Guantao Formation of the Neogene in Jiyang Depression is a braided river delta sedimentation rather than fluvial facies. The braided river delta has developed submerged braided river, river mouth bar, frontal sheet sand and other microfacies. This new discovery is of great significance for oil exploration and production of the Neogene in Jiyang Depression.