JDX-2D electrode system logging tool is a downhole apparent resistivity logging combination tool. It can simultaneously measure the apparent resistivity curves of the gradient electrode system and the potential electrode system in one trip, and can also measure the natural potential curve without power supply. Resistivity logging is an ancient logging method. It has been well developed in the early stages of well logging development. Resistivity logging and natural potential logging are based on the resistivity differences and electrochemical differences in the lithology of the borehole section, and the formation properties are studied by measuring this difference. Although apparent resistivity measurement is affected by many factors such as well fluid, borehole diameter, rock formation polarizability, etc., it is still one of the widely used well logging methods.

Apparent resistivity logging is widely used as a basic logging method in various fields of metal mines, petroleum, coal fields and hydrology. Resistivity and natural potential logging are also good means of evaluating coal quality, water quality, salinity, ore grade, etc.

The JDX-2D electrode system logging tool adopts a solution where power supply and measurement are completed underground. The tiny signals measured in this way are amplified, analog-to-digital converted and encoded underground and then transmitted to the surface. This solves the problem that analog-to-digital signals are susceptible to interference when transmitted directly through long cables, and improves the accuracy of measurement. The instrument adopts a microcontroller system that automatically adjusts power supply and measurement, which simplifies the instrument operation process and improves logging efficiency. The size of the electrode system can be customized according to user requirements, and the combined measurement parameters can also be selected and customized by the user.