沾化凹陷馆上段湖相沉积砂体特征

Characteristics on lithosomic sand bodies of upper member of Guantao formation in Zhanbua depression

综合利用录井、测井、古生物及相关分析化验资料,并重点通过连续取心井的岩心观察,提出了沾化凹陷馆上段不仅发育河流相,还发育湖相沉积砂体的观点。研究区馆上段在沉积早期发育辫状河、曲流河等河流相沉积体系,在沉积中晚期发育浅水三角洲—浅水湖泊、滨浅湖滩坝和浅水振荡湖泊沉积体系。将湖相沉积理论及沉积模式应用于与油田生产密切相关的小层对比、寻找剩余油和油气勘探中,使小层对比更具科学性,同时拓展了勘探领域,研究区Ng1+2砂层组滩坝砂体和水道砂坝与砂坪砂体是较好的勘探目标。

Comprehensively using well drilling, well log, logging, regional geological characteristicS, all kinds of dynamic and quiescent data, we obtain the conclusions that the upper member of Guantao formation in Zhanhua depression developed not only fluvial facies but also lacustrine sand bodies. The early upper member of Guantao formation developed fluvial facies of braided and meandering streams, and the middle-late developed depositional systems of shore and shallow lacustrine and shallow delta-oxidizing and fluctuated shallow lake. The lacustrine depositional model expands the exploration area, and the lacustrine depositional theory, combining with production practice of oilfield, makes stratigraphic correlation more reliable. The beach bar, channel sand, and flat sand bodies are better exploration areas of Ng1+2 in Zhanhua depression.