Study on Reservoir Architecture and Reservoir Units of Fluvial Deposits of Dongying Formation in Yuke Oilfield
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摘要: 为解释榆科油田榆108和榆24断块东营组存在的油水关系复杂、注采不对应、注水开发效率差等问题.通过采用地质、地球物理及开发动态资料，开展沉积微相、单河道及点坝砂体储层构型研究，提出2类河流相砂体连通模式；结合生产动态，在研究区内河流相储层中，划分出4类油藏单元和5类油藏单元组合.给出3个实例，证明基于沉积微相和储层构型研究划分出的油藏单元，可用于解释油藏勘探开发中暴露的矛盾.该研究可为下一步油藏精细开发调整、提高油藏开发水平提供依据.Abstract: In order to explain the problems of Dongying Formation in Yu108 and Yu24 fault blocks in Yuke Oilfield, such as complicated oil-water relationship, non-correspondence of injection-production and efficiency of water-injection development. Based on the study of microfacies and reservoir architecture of the fluvial reservoir of Dongying Formation in Yuke oilfield by using core, well loggings, seismics, lab analysis, production dynamics and reservoir monitoring data, this paper proposes two connection patterns of single channel and point bar. Combined with the production dynamic analysis, an oil reservoir unit classification scheme is proposed, consisting of four reservoir units and five combinations of reservoir units. In this paper, three examples are given to prove the reservoir units divided based on the study of sedimentary microfacies and reservoir architecture can not only explain the problems existing in the development of Dongying Formation reservoirs in the Yuke Oilfield, but also provide theoretical basis for fine development and adjustment of reservoirs and improvement of reservoir development level.
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图 1 冀中坳陷深县凹陷榆科油田构造井位及区域构造位置
单位：m
Fig. 1. Structural well location and regional structural location map of Yuke oilfield in Shenxian Sag, Jizhong Depression
图 2 榆科油田东营组油藏曲流河砂岩典型沉积构造
Fig. 2. Typical sedimentary structure of meandering river sandstone of Dongying Formation in Yuke oilfield
图 3 榆科油田东营组河流相油藏单河道砂体识别的对比标志
单位：m
Fig. 3. Comparison mark for identification of single channel sand body in fluvial facies reservoir of Dongying Formation in Yuke oilfield
图 4 Ed1-Ⅰ-10地层切片Mean Amplitude属性图沉积解释
Fig. 4. Ed1-Ⅰ-10 stratigraphic section Mean Amplitude attribute diagram sediment interpretation
图 6 对子井法计算侧积层倾角β和侧积层间距ΔL
a. 对子井法示意图；b. Ed2-Ⅱ-11小层对子井附近沉积微相平面分布图；c. Ed2-Ⅱ-11小层侧积层1和侧积层2；d. Ed2-Ⅱ-13小层侧积层3和侧积层4
Fig. 6. Paired wells method for calculating the angle β and spacing ΔL of lateral accretion surfaces
图 7 多曲流河道叠加和单河道侧积体连通性评价
Fig. 7. Evaluation of multimeander channel superposition and single channel lateral integration connectivity
图 8 榆科油田东营组曲流河油藏单元及组合的分类表（注水开发阶段）
PB. 点坝；ACH. 末期/废弃河道；CCH. 决口水道；CVS. 决口扇；OB. 越岸沉积；FP. 泛滥平原（河漫）；CHB. 心滩；L. 侧积层延伸长度；h. 河道满岸深度
Fig. 8. Classification table of the units and combinations of the curved liuhe reservoir of Dongying Formation, Yuke Oilfield (waterflood development stage)
图 9 榆科油田东营组油藏Ⅳ油组3小层油藏单元平面图和剖面
海拔单位：m
Fig. 9. Plan and section map of reservoir unit of the Ⅳ-3 layer of Dongying Formation, Yuke Oilfield
图 10 A4型油藏单元中注采关系、沉积微相、储层构型及示踪剂综合分析图
a. Ed1-Ⅱ-11小层Y108-10注采井组断层构造-沉积微相-储层构型-油藏单元分布图；b. 注水井（Y108-10）及采油井（Y108-27和Y108-17）注水曲线及生产曲线；c. 注采井组示踪剂分析成果表
Fig. 10. Comprehensive analysis diagram of injection-production relationship, sedimentary microfacies, reservoir configuration and tracer in A4 reservoir unit
图 11 Ⅰ油组8和9小层不同点坝纵向深切型油藏单元（A1）
a. Ed1-Ⅰ-8+9小层油藏单元平面图；b. Ed1-Ⅰ-8+9小层隔夹层等厚图；c. 构型剖面；d. 油藏剖面；e. 开发曲线；海拔单位（m）
Fig. 11. Reservoir units with deep longitudinal cutting at different point bars in the eighth and ninth small layer of the Ⅰ oil group (A1)
表 1 单河道砂体和点坝构型单元定量经验公式
Table 1. Quantitative empirical formula for single sand body and point bar architecture element
公式序号 学者 经验公式 备注 1 Schumm et al.（1960） F=255M-1.08 F：河道宽深比，无量纲；
M：粉泥质含量(%)；
H：满岸河道深度(m)；
hm：平均交错沙丘厚度(m)；
a：参数，无量纲；
Sm：平均交错层厚度(m);
h：平均砂体厚度(m);
Wm：满岸宽度(m)；
WL：侧积体宽度(m)；
β：侧积倾角(°);
Wc：单一曲流带宽度(m);
Wd：点坝长度(m)；
Wa：侧积层最大宽度(m)2 Bridge et al.（1972） H=6hm；a=Sm/(1.8hm)；hm= 2.22a1.332 3 Leeder（1973） Wm=6.8H1.54 4 Wm=1.5H/tanβ 5 WL= 2Wm/3 6 Bridge and Mackey（1993） Wm=59.9h1.8 7 Lorenz et al.（1985） Wc=7.44Wm1.01 8 岳大力等（2018） Wd=3.631 9Wm+40.612 
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