Simulation of Array Laterolog Response of Fracture in Fractured Reservoir
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摘要: 为了研究裂缝性储层裂缝的阵列侧向测井响应, 采用裂缝组平板裂缝模型, 利用三维有限元方法, 进行不同裂缝参数条件下的高分辨率阵列侧向测井响应数值模拟.表明阵列侧向视电导率和裂缝孔隙度与裂缝流体电导率成线性关系; 低角度裂缝的阵列侧向深浅视电阻率呈现负差异特征, 高角度缝呈现正差异; 相同裂缝孔隙度下, 裂缝密度增加可使得阵列侧向视电阻率增加, 当裂缝密度足够大时, 测井响应特征基本不随裂缝密度发生变化; 交叉缝的测井响应与具有相同角度的平行裂缝组差异明显, 且不同倾角组合的交叉缝的测井响应之间差异明显.阵列侧向测井对裂缝有较强的敏感性, 根据其测井视电阻率大小可以评价裂缝孔隙度, 根据深浅视电阻率的幅度差异可以研究裂缝的产状, 这些为将阵列侧向测井用于裂缝性储层裂缝评价有指导意义.Abstract: To understand the response of array laterolog to fracture in the fractured reservoir, based on the plane model of parallel fractures with equal space, the three-dimensional finite element method is used to simulate the responses of the high-definition array laterolog in fractured formation with different fracture parameters.The results show that conductivitites of array laterolog are linearly related to the porosity of fracture and the conductivity of pore fluid.A negative separation between the deep and shallow resistivity appears in the low-angle fractured formation, the positive appears in high-angle conditions.Apparent resistivity increases gradually with fracture density increasing under the same porosity of fracture conditions.If fracture density is large enough, the log response will not vary with essentially fracture density.Log response of crossing fracture is apparently different from that of the parallel fracture group with the same angle, and log response of crossing fracture is different under the different dip grouping system.Accordingly the array laterolog is sensitive to the fracture and its apparent resistivity can be used to determine the fracture porosity and the separation between the deep and shallow apparent resistivity can be used to study the fracture attitude.The above researches have contributions to the application of array laterolog in the fractured reservoir evaluation.
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Key words:
- fracture reservoir /
- fracture group /
- fracture dip /
- fracture aperture /
- porosity of fracture /
- fracture fluid /
- array laterolog
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图 3 单一裂缝的阵列侧向测井响应与张开度的关系
Fig. 3. Array laterolog response of single fracture with different fracture aperture
图 4 单一裂缝的阵列侧向响应与裂缝倾角的关系
Fig. 4. Array laterolog response of single fracture with different fracture angle
图 5 裂缝组的测井响应与裂縫角度的关系
Fig. 5. Array laterolog response of fracture group with different fracture angles
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