裂缝型储层电成像测井响应三维数值模拟

根据微电阻率扫描成像测井仪器的设计原理、结构及测量方式．利用三维有限元法研究了微电阻率扫描成像测井仪器对裂缝的响应，模拟了测井响应随裂缝宽度、裂缝延长深度、电阻率对比度及裂缝倾角的变化关系，并考察了仪器对2条水平裂缝的分辨率。研究结果表明：单一水平裂缝的宽度和电阻率对比度的变化对测井响应有明显的影响：高角度裂缝的测井响应出现明显的不对称现象；双水平裂缝间距小于5mm时．2条裂缝无法分辨开来。这一研究结果对于利用电成像测井进行裂缝识别及定量评价具有参考价值。

Three-dimensional numerical simulation of electrical imaging logging response in fractured reservoir

According to the design principle, structure and logging mode of micro-resistivity image logging instrument, this paper studied the electrical image logging response characteristics to fractured reservoir by three-dimensional finite element method, simulated the logging response changes with the fracture width, fracture extension depth, resistivity contrast and fracture dip, and researched the resolution of the instrument to the two horizontal fractures. The results show that the changes of fracture width and resistivity contrast have obvious influence on the logging response. The logging response to high angle fracture appears obvious asymmetry. If the double horizontal fracture spacing is less than five millimeter, they can not be distinguished. This research result is helpful for using electrical image logging to identify and quantitatively evaluate fracture.