lateral logging
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Laterolog is a resistivity logging method. Its feature is that shield electrodes of the same polarity are placed on both sides of the power supply electrode, thereby keeping the current from the main electrode within a narrow range as it penetrates vertically into the formation, **reducing mud diversion and the influence of the surrounding rock layers. Lateral logging is an important method for overcoming the effects of saline mud and studying high-resistance thin formations. Depending on the number of electrodes, it is further divided into three-electrode lateral logging, seven-electrode lateral logging, and eight-electrode lateral logging, etc. Lateral logging essentially involves studying changes in the grounding resistance of the main electrode, and is also known as shielded grounding resistance logging. Different electrode arrangements and sizes result in different detection depths, which is why there are deep and shallow lateral logging types. The combined use of deep and shallow lateral logging enables the study of the properties of the mud invasion zone in permeable formations, which aids in the separation of oil and water layers.
Shield electrodes of the same polarity are placed on either side of the power supply electrode, thereby keeping the current from the main electrode within a narrow range as it penetrates vertically into the formation, **reducing mud diversion and the influence of the surrounding rock layers. That’s great! Lateral logging can be divided into deep, shallow, three-type, seven-type, and eight-type lateral loggers, which is mainly related to the number of electrodes and their properties. The principle is as mentioned by the original poster: it is similar to microelectrode and microgradient logging (extended to microsphere-focused logging). All these methods rely on a focusing principle, and it is through this principle that the detection depth is controlled. I’m not sure if that’s correct