摘要
裂缝性储层高角度裂缝的双侧向测井响应通常呈正差异,低角度裂缝的双侧向测井响应呈负差异,这种裂缝响应的正负差异是由临界角决定的,是划分裂缝状态及判断响应差异的重要依据。针对裂缝性储层的特点,利用三维有限元法模拟不同条件下裂缝性储层的双侧向测井响应。同一双侧向测井仪器使用不同情况下刻度的电极系系数K值得到的临界角差异较大,不同公司的仪器使用相同条件下刻度的K值其临界角也会存在差异。裂缝孔隙度、基岩电阻率、泥浆电阻率、井径等这些因素对临界角的大小都有影响,尽管临界角变化不大,但在判断裂缝状态时应综合考虑这些影响因素,提高根据不同裂缝状态反演计算裂缝性储层参数的准确性。
In fractured reservoir, the dual laterolog responses in high-angle fracture usually have positive separation and in low-angle fracture have negative separation, which is determined by the critical angle and is a important criterion to classify the fracture types and judge the response sep-aration. According to fractured reservoir characteristics, the dual laterolog responses in fractured reservoir with different conditions are simulated using 3-D FEM （Finite Element Method）, and the critical angle is not only affected by instrument types and K-factor, but also related with res- ervoir parameters and borehole conditions. So, in order to correctly classify the fracture types u- sing the critical angle, these factors, such as fracture porosity, bedrock resistivity, mud resistivi-ty and borehole diameter, etc. , should be considered to improve the accuracy of fractured reser-voir parameters from inversion on the basis of different fracture types.
出处
《测井技术》
CAS
CSCD
北大核心
2012年第5期456-459,共4页
Well Logging Technology
关键词
双侧向测井
裂缝性储层
测井响应
临界角
有限元法
doul laterolog, fractured reservoir, logging response, critical angle, Finite Element Method （FEM）
