斜井中各向异性储层阵列侧向测井正演响应特性

Forward response of array lateral logging in anisotropic reservoir of inclined shaft

阵列侧向测井是在常规双侧向测井仪器的基础上发展起来的一种新型测井仪器,可提供6种不同探测深度的电阻率值。利用有限元数值模拟技术对阵列侧向测井响应进行了模拟,研究了斜井状态下仪器响应随井斜角、储层各向异性系数变化的特征。研究表明:当井斜角小于30°时,R_1,R_2受影响较小;井斜角大于30°,阵列侧向测井响应普遍受井斜角影响较大;井斜角小于30°时,R_3,R_4,R_5基本不受储层各向异性特征的影响;井斜角大于30°,R_3,R_4,R_5随各向异性系数变化明显;探测深度较浅的R_1,R_2受储层各向异性特征影响明显。

Array lateral logging is a new logging tool developed from conventional dual laterolog tool, which provides six resistivity values of different depths of detection. Based on the finite element numerical simulation technique, the response of array laterolog was simulated. On the basis of the correctness of the model under the two-dimensional model, the characteristics of the array lateral logging response with inclined angle and reservoir anisotropy coefficient were studied. The results show that when the angle of deviation is less than 30°, R1 and R2 are negatively affected. While the angle of deviation is larger than 30°, the response of the array lateral logging is generally affected. When the angle of deviation is less than 30°, R3, R4 and R5 are not affected by the reservoir anisotropy. When the angle of deviation is more than 30°, R3, R4 and R5 change obviously with the anisotropy coefficient, and the two kinds of responses of R1 and R2 for shallower exploration are obviously affected by the anisotropy of reservoir.