电阻率测井的主要目的之一,是求准地层真电阻率,但由于泥浆侵入影响,尤其在侵入深度较大时,却往往求不准。为了克服泥浆的侵入影响,就必须增加仪器的探测深度,这样就要增加仪器的长度,并使仪器的测值受邻层(或围岩)的影响变大。虽然具有聚焦作用的仪器(感应测井仪或侧向测井仪)有可能不降低纵向分辨能力而增加探测深度,但仍是有限的。假如选择三种(至少三种)适当的电阻率测井方法,其探测深度不同而纵向 One of the main purposes of resistivity logging is to find the true resistivity of the formation. However, due to the mud invasion, especially when the depth of penetration is large, it is often not accurate. In order to overcome the invasion effect of mud, it is necessary to increase the depth of detection of the instrument, thus increasing the length of the instrument and increasing the measurement value of the instrument affected by the adjacent layer (or surrounding rock). Although focusing instruments (inductive tools or lateral tools) are likely to increase the depth of investigation without degrading their longitudinal resolution, they are still limited. If you choose three (at least three) the appropriate resistivity logging method, the depth of their exploration of different vertical