Abstract：Utilizing axial view downhole TV(ATV) and digital panoramic borehole camera system(DPBCS)，continuous images of 360°borehole wall are obtained from forward-looking and side-looking，respectively. Through the qualitative description and quantitative analysis of borehole phenomena with the images which acquire downhole with borehole optical imaging technology，it is found that these images have characteristics of high resolution，high wall coverage of and visual credibility. Based on the research and application results of geological phenomenon，engineering activity，solution and fractured zones observation，their individual characteristics and applicability are summarized；and these two methods are proven to have good complementary contribution to logging. By comparison of the individual characteristics with other geophysical methods such as borehole imaging，drilling data，electromagnetic wave tomography and elastic sound wave，a combined analytical way to utilizing the 100% coverage of wall and high resolution images by digital borehole imaging is proposed，utilizing the strata extend data in hole-hole section by electromagnetic wave CT and proceeding the three- dimensional developmental condition about the geological structure(as fractured zone) in boreholes. The DPBCS can provide image evidence for other geophysical method for the wall interval images are variable whereas the wall length of ATV images is fixed. The quantitative description of fractured zone with borehole wall unrolled images was studied；it is indicated that the percentage of image area is also applicable for fractured zone grading. The percentage of integrity area in the wall unrolled image area with fracture area is subtracted from which is close to the total core recovery(TCR) based on core length percentage.
