摘要
高邮凹陷周庄油田戴一段油藏存在油藏类型及砂体展布等认识不清的问题,在前人研究的基础上,通过岩心观察和粒度特征分析等研究认为,研究区主要发育扇三角洲沉积,局部发育三角洲沉积。以砂体的展布规律为主要依据的物源方向进行研究认为,周庄地区E2d1沉积时期存在来自吴堡低凸起和北西方向的"双向物源",并利用单一小层的解剖,在E2d11砂组4小层中发现了2个物源交汇处发育的一条砂岩尖灭带。研究区E2d12下段9、10号小层属于岩性上倾尖灭油藏。通过对该油藏类型的新认识,重新预测了砂体的边界,并成功对周15井实施了侧钻,为该油田的滚动扩边提供了方向,初步估算可增加经济可采储量超过60×104t。
The type and sand body distribution of the Dai I member reselwoir in the Zhouzhuang Oilfield within the Gaoyou sag are indistinct yet. Based on predecessors＇ studies, by core observation and grain size feature analysis etc., it reaches the conclusion that the study area chiefly develops fan delta deposit, locally with delta deposit. Ac- cording to the analysis of provenance direction that is mainly based on distribution rule of sand bodies, there were ＂bidirectional provenances＂ { i.e., the Wubu low bulge and the northwest zone） during the deposit period of E2dI in the Zhouzhuang region. Moreover~ by dissecting single sub-layer, we tbund a sand pinehout belt in the intersec- tion zone of the two provenances in 4th sub-layer of the E2d1^1 sand group. No.9 and No. 10 sub-layers in lower E2d1 of the study area belong to lithologieal updip pinchout reservoirs. By new cognition of this reservoir type, we predicted the sand body boundary again, and successfully conducted sidetrack drilling of Well Zhou 15, which pro- vides direction of rolling boundary extension for this oilfield. The preliminarily estimated new economically recovera- ble reserves is more than 60×10^4t.
出处
《特种油气藏》
CAS
CSCD
北大核心
2017年第5期10-14,共5页
Special Oil & Gas Reservoirs
基金
中国石化科技攻关项目"小断块油藏油水过渡带提高采收率技术研究"(P13125)
关键词
岩性油藏
沉积微相
成因分析
周庄油田
戴南组
lithological reservoir
deposit microfacies, genesis analysis
Zhouzhuang Oilfield
Dainan Formation
