摘要
对于厚度薄、层数多、垂向叠置、横向连片的滨浅湖滩坝砂体,以小层为单位的沉积微相平面图不能准确反映砂体的分布特征,如果开展单砂体级别的沉积微相研究,则可以精细描述单一坝砂体。文中以柴达木盆地扎11井区新近系上新统下油砂山组第Ⅳ油层组第10小层为例,探索精细刻画单一坝沉积微相的方法。具体步骤为:1)根据测井相特征在单井上识别坝中和坝缘;2)根据单砂体底部等高、测井曲线形态相似及单一坝水低油高的特征,开展单一坝井间对比,由此确定单砂体分布范围;3)从下向上厘定单一坝的形成期次;4)将各井中单一坝的沉积微相和分布范围投射到平面图上,并结合平面油水关系适当调整。这种方法能够实现对单一坝砂体的精细刻画,对加密井部署和注采调整有重要的指导意义。
In shore and shallow lake,beach-bar sand bodies are often characterized by thin thickness,multilayers,superimposition in vertical direction,and sheet shape in lateral direction.Therefore,the sedimentary microfacies plan in the unit of individual reservoir cannot show the sand body distribution characteristics accurately,and sedimentary microfacies research of single sand body will help to descript single bar in detail.Taking N2^1Ⅳ-10 individual reservoir in Zha 11 wellblock in Qaidam Basin as an example,the method to descript the single bar microfacies in detail is explored in this paper.This work has been done by the following steps:identify bar center and margin from well loggings based on logging facies;on the principle of same bottom height,similar logging curve shape and law of low water and high oil in one single sand body,confirm every single bar range by correlating single bar from well to well;dividing single bars into different stages in well-tie section;project the single bar microfacies and distribution range of the single-stage to the plane to sketch the microfacies plan,then to adjust some range of the sand body with the oil-water distribution law.As a result,single bar microfacies are descripted in detail by this method.These microfacies plans can describe detailed single sand bodies and are very helpful to deploy infilling well and adjust injection-production well.
作者
胡光明
何幼斌
李积永
李汉阳
许玛丽
李军
HU Guangming;HE Youbin;LI Jiyong;LI Hanyang;XU Mali;LI Jun(School of Geosciences,Yangtze University,Wuhan 430100,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;Exploration and Development Research Institute,Qinghai Oilfield Company,PetroChina,Dunhuang 736202,China)
出处
《断块油气田》
CAS
CSCD
北大核心
2020年第2期171-175,共5页
Fault-Block Oil & Gas Field
基金
国家自然科学基金项目“稳定构造背景下气候驱动的陆相河流层序地层模式研究”(41472097)
中国石油大学(北京)油气资源与探测国家重点实验室基金项目“放射性测井反演古气候新方法研究”(PRP/open-1608)
中国石油天然气股份有限公司重大科技专项“柴达木盆地建设高原大油气田勘探开发关键技术研究与应用”(2016E-01)。
关键词
滨浅湖
单一坝
单砂体
沉积微相
柴达木盆地
shore and shallow lake
single bar
single sand body
sedimentary microfacies
Qaidam Basin
