复杂泥浆侵入环境下阵列侧向测井正演响应特性研究

阵列侧向测井仪器相较常规双侧向测井仪器可以得到多种探测深度的电阻率值(R₀－R_５),能更精细的描述侵入剖面,从而更准确求取地层电性参数,目前已在油田得到较广泛的应用。利用有限元法对复杂泥浆侵入环境下的阵列侧向测井响应进行了数值模拟。在研究了阵列侧向测井探测特性的基础上,对泥浆侵入的复杂情况逐一进行了研究。研究发现,探测深度越大的模式对应电阻率值受泥浆不对称侵入程度的影响越大；探测深度较浅的模式的电阻率值受强纵向泥浆侵入向各向异性影响较大；阵列侧向测井响应普遍受径向泥浆侵入各向异性影响严重；中探测深度的阵列侧向响应对低阻环带比较敏感。

Study on Forward Response Characteristics of Array Lateral Logging with Complex Mud Invasion

Compared with the conventional dual laterolog tool, array lateral logging tool can obtain various resistivity values of different investigation depths(R0-R5). It can be used to describe the invasion profile more accurately, and to obtain the electrical parameters of formation more accurately, so it has been widely used in oil field. The finite element method is used to simulate the response of array lateral logging under complex mud invasion. Based on the study of the characteristics of array lateral logging, the complex situation of mud invasion is studied one by one. It is found that the larger the investigation depth is, the larger the effect of the resistivity value is affected by the degree of asymmetry invasion of mud. The resistivity value of the model with shallow depth of investigation is greatly affected by the strong longitudinal anisotropy mud invasion. And array lateral logging response is generally affected by radial anisotropic mud invasion. The array lateral logging response of the medium investigation depth is sensitive to the low resistivity zoon.