结合模糊综合评判与随机建模识别夹层空间分布——以孤岛油田中一区馆6段为例

Identifying spatial distribution of the interlayers with fuzzy evaluation and stochastic modeling-taking Guantao 6 Member in Zhongyi area of Gudao Oilfield as an example

识别夹层在储层空间上的三维分布,可以更好地指导油田剩余油预测和挖潜,提高油田采收率。使用模糊综合评判法识别夹层,以此为约束条件,结合储层随机模拟建立夹层空间分布模型,为夹层空间分布的研究提供了新思路。模型分析结果表明,孤岛油田中一区馆6段夹层分布范围广,其形态、分布规律复杂,厚度变化大,平均厚度为0.61m,延伸距离为50～180m,分布面积一般为0.01～0.1km2,分布密度为0.11～0.63m/m,分布频率为0.52～1.24个/m,单夹层厚度为0.4～5.5m,储层非均质性较强。

Identifying the 3D spatial distribution of the interlayers in reservoirs can provide better guidance to find remaining oil,tap the potential and improve recovery efficiency.Fuzzy comprehensive evaluation method is applied to identifying the interlayers.Three-dimension spatial distribution model of the interlayers is built with reservoir stochastic simulation on the basis of the above results as constraint conditions,which offers a new method for studying the 3D spatial distribution of the interlayers.The model analysis reveals many interlayers found in Ng6,Zhongyi area,Gudao Oilfield,while the distribution regularities and shapes of the interlayers are complex.Their thickness varies in different areas with 0.61m of the average thickness.Extended distance is 50-180m,and the distribution area is 0.01-0.1km2.Interlayer distribution density is 0.11-0.63 m/m,distribution frequency is 0.52-1.24 layers/m,and single interlayer thickness is 0.4-5.5m.The reservoirs in Guantao 6 Member are of high heterogeneity.