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以鄂尔多斯盆地长8致密油藏为例，利用聚类分析方法，根据有效厚度、孔隙度、渗透率、储层品质因子和含油饱和度5个参数划分出4类原始流动单元，在静态参数的基础上，根据储层加砂强度、产液量2个动态参数将研究区储层划分为4类开发后流动单元，并对开发前后流动单元进行三维建模，对流动单元的分布特征进行分析；结合剩余油数值模拟研究，对研究区油藏进行挖潜级别划分并给出了开发策略。研究表明，沉积相展布控制着原始流动单元分布，高级别流动单元沿着主河道分布延伸，砂体厚度大，砂体呈叠加式连续展布；低级别流动单元分布于主河道两侧，砂体厚度变小，砂体呈分离式。开发方式控制着动态流动单元，经压裂改造后，井周流动单元普遍优于井间流动单元。油藏经过压裂改造及阶段开采后，流动单元A类和B类区由于流动性强、采出程度高导致含油饱和度逐渐降低，剩余油富集区逐渐向流动性相对较差的C类和D类流动单元转移。根据开发后流动单元分布和剩余油展布特征，可将开发区块划分为6种挖潜级别，一级挖潜区剩余油含量和开发后流动单元级别均高，为下一步生产开发的首选区域；二级挖潜区开发后流动单元级别较低，但剩余油多，可配合一级挖潜储层进行共同开发。本研究可为同类型的致密油藏流动单元研究和后期开发方案调整提供借鉴意义。
Abstract：Taking the Chang 8 tight reservoir in Ordos Basin as an example, the cluster analysis method is used to divide the reservoir into four types of initial flow units according to the five static parameters of effective thickness, porosity, permeability, reservoir quality factor, and oil saturation. On the basis of static parameters, the reservoir in the study area is divided into four types of developed flow units according to the two dynamic parameters of reservoir sand strength and liquid production. The three-dimensional modeling of the flow units before and after development is carried out, and the distribution characteristics of the flow units are analyzed. Combined with the numerical simulation of remaining oil, some suggestions are put forward for the subsequent reservoir potential tapping scheme. The research shows that the distribution of sedimentary facies controls the distribution of static flow units, and the high-level flow units extend along the main channel. The thickness of sand bodies is large, and the sand bodies are superimposed and continuously distributed. The low-level flow units are distributed on both sides of the main channel, the thickness of the sand body becomes smaller, and the sand body is separated. The development method controls the dynamic flow unit. After fracturing, the flow unit around the well is generally better than the inter well flow unit. After stage oil recovery and fracturing, the fluidity of the Class A and Class B of flow unit and the initial high value of oil saturation increases while the oil saturation decreases, resulting in the remaining oil-rich area being transformed into Class C and Class D flow units with relatively poor fluidity. Based on the distribution of developed flow units and the distribution characteristics of remaining oil, the reservoir can be divided into six potential tapping levels. The remaining oil content and developed flow unit level of the first-level potential tapping reservoir are high, which is the preferred area for the next production and development. The developed flow unit level of the second-level potential tapping reservoir is low but the remaining oil content is high, which can be jointly developed with the first-level potential tapping reservoir. The research provides reference for the study of flow units and the adjustment of later development schemes in the same type of tight oil reservoirs.
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基本信息:
DOI：10.16152/j.cnki.xdxbzr.2026-01-016
中图分类号:TE327
引用信息:
[1]尹虎,屈红军,张磊岗,等.致密油藏开发前后流动单元动态变化与剩余油分布关系[J].西北大学学报(自然科学版),2026,56(01):171-186.DOI:10.16152/j.cnki.xdxbzr.2026-01-016.
基金信息:
国家自然科学基金重大项目及面上项目(41390451,41172101)
2026-02-24
2026-02-24