Investigation Depth of MWD Propagation Resistivity Logging.
Shi Xiaofeng, Li Zheng, Cai Zhiquan.
In LWD resistivity logging, the amplitude based log and the phase based log are often separated in formation. In this paper, the investigation depth of LWD propagation resistivity tool is studied in detail, the results of which show that the separation is related to the method used to convert phase and amplitude data into risistivity. The paper also indicates that the depth of investigation based on IRPGF (integrated radial pseudo geometrical factor) is at most a qualitative statement, and in such sense, that deeper IRPGF investigation depth does not mean its measurement is always closer to the uninvaded formation resistivity. At the end, the elements effecting the investigation depth are sumed up, and the more reliable method for evaluating the invaded formation with the LWD resistivity tool is put forward.
【CateGory Index】： P631.8