苏北盆地溱潼凹陷阜宁组第三段物源-沉积特征

Provenances and depositional features of the 3rd Member of Funing Formation in Qintong Sag,Subei Basin,China

通过岩心观察、薄片鉴定、测井曲线等资料的综合分析,探讨苏北盆地溱潼凹陷阜宁组第三段的物源方向、岩石类型、古生物及沉积构造特征。阜宁组第三段沉积期物源主要来自北部,南部泰州凸起及西南斜坡无物源供给;溱潼凹陷斜坡带主要发育三角洲前缘亚相沉积;泰州凸起两侧及溱潼凹陷西南斜坡南华-兴旺地区为浅湖沉积环境,发育浅湖滩坝砂储层。斜坡带三角洲前缘主体部位是构造型油藏勘探有利区,西南斜坡带南华-陈家舍地区三角洲前缘侧翼-浅湖滩坝沉积区是岩性油藏勘探的有利区。

Based on the drilling core observation,thin section identification and logging curve analysis,the characteristics of provenance direction,lithology,paleontology and sedimentation of the 3rd Member of Funing Formation in Qingtong Sag are studied.It shows that the depositional materials of the 3rd Member of Funing Formation mainly came from the northern direction and the depositional materials hardly reached to the Taizhou uplift and southeast slope.Analysis indicates that the slope belt of Qintong Sag mainly consists of delta front subfacies deposition.Taizhou uplift and Nanhua-Xingwang area of southeastern slope in Qintong Sag are characterized by sallow lacustrine facies and develop shallow lake beach bar sand reservoir.It is considered that the slope delta front is a favorable exploration zone of structural oil traps,while the lateral zone of delta front and the depositional area of shallow lacustrine beach bar is favorable exploration zone of lithologic oil traps.