k value of SFL tool in homogeneous media mainly depends on the size of electrode array,and its accuracy is a good help to the design of the array.

Secondly, it presents the research in three areas on this topic in detail after the main frame of this topic is introduced, which are the design and calibration of electrode array test unit for measuring the resistivity, the hardware design, installation, software development and debugging of one-dimensional resistivity measurement device on gas hydrate.

The experiments are carried out on the electrode system which is a key factor to have influence upon the detecting results of the aging properties.

The application of the PC-based controller of SIEMENS WinAC to the electrode control system of Ladle Furnace is introduced in this paper,fieldbus and WinAC Open Developer Kit(ODK) entitle electrode system to character of real-time and reliability.

If we have not low dual laterolog data,quantitative formation resistivity information are acquired from borehole micro-resistivity imaging logging responds,each button electrode constant must be simulativly calculated by the logging responds.