Potential of detection range of borders of oil reservoir using logging tool with broadband electromagnetic pulse

On large-scale radar stand at the IF SB RAS, the experiments on sensing of oil-saturated sand using the laboratory pulsed electromagnetic logging tool, which was placed in a cylindrical shell of a commercially available borehole logging tool (VIKIZ), were conducted. For this purpose a big wood box (1.5м x 3.2м x 2.7м) filled moist sand moisturized with brine was built. The box was located in a laboratory room on a concrete screed. Borehole radar antennas are resistively loaded dipole antenna with extended bandwidth. The transmitting antenna was connected to the hi-voltage (~3kV) generator, the receiving antenna to the stroboscopic oscilloscope. With variation of the distance between the transmitting and receiving antennas the signals of receiving pulses were recorded. On the basis of measurements of the pulse shapes at the output of the receiving antenna, depending on the distance between the transmitting and receiving antennas were found propagation velocity and attenuation of sensing pulses. Experimentally was proved the possibility of recording probe pulses, that propagates in the oil-saturated sand at the distance up to 2.65 m. At given dynamic range of the logging tool transceiver (128.3 dB), the boundary of the oil-saturated sand can be detected at the distances up to 1.3 m. Furthermore it is shown that temporary forms of sensing pulses measured at the output of the receiving antenna of the logging tool are described theoretical model with high accuracy. The results of this study allow you to plan and start bench testing of prototypes borehole probes.