利用不确定性高精度反演数据表征曲流河储层构型

发布时间：2018-01-26 22:20

  本文关键词： 曲流河 河道 点坝 不确定性反演 储层构型 明化镇组下段Ⅱ油组小层　出处：《石油地球物理勘探》2017年03期 　论文类型：期刊论文

【摘要】：由于曲流河储层构型横向岩性变化快、储层空间变化复杂、单砂体厚度小,而海上油田井距大、井网稀疏,因此采用陆上密井网条件下的多井预测方法很难准确表征曲流河储层构型;地震解释方法受常规地震资料及常规反演资料纵向分辨率的限制,只能识别厚度为10~20m的大套厚层砂体,无法识别薄互层小砂体,也不能满足曲流河储层构型分析的精度要求。为此,在曲流河砂体沉积模式的指导下,以不确定性高精度反演数据为基础,结合测井数据分析,采用"垂向分期、横向定边、三维定型"的方法对渤海W油田明化镇组下段Ⅱ油组3小层(N_(2m)~LⅡ-3)的R23砂层组的曲流河砂体构型进行层次分析。根据测井曲线形态差异和反演地震数据特征将R23砂层组在垂向上划分为R23-1和R23-2两个沉积单元,在R23-1和R23-2两期复合河道中识别出6条近SN向展布的单一河道,且在单一河道内识别出多个规模不等的复合点坝,在海上油田稀疏井网条件下精细识别了不同级次曲流河砂体构型边界,有效提高了复合河道、单河道及点坝体的识别精度。
[Abstract]:Because of the rapid change of lateral lithology of meandering river reservoir, the complex spatial change of reservoir, the small thickness of single sand body, the large well spacing and sparse well pattern in offshore oil field. Therefore, it is difficult to accurately characterize the conformation of meandering river reservoir by using multi-well prediction method under the condition of overland dense well pattern. The seismic interpretation method is limited by the vertical resolution of conventional seismic data and conventional inversion data, so it can only identify large thick sand bodies with thickness of 10 ~ 20m, and can not identify thin interbedded and small sand bodies. Therefore, under the guidance of the sedimentary model of meandering river sand body, based on the uncertainty and high precision inversion data, combined with log data analysis. Adopt "vertical staging, lateral fixing edge." Three-Dimensional stereotyping method for formation 3 of Lower member 鈪，

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