Abstract
SUMMARY Seismoelectric logging method is based on measuring the electric field generated by the seismic waves in a fluid-filled borehole. Two kinds of the electromagnetic (EM) fields can be generated inside the formation and at the interface of formations. One is a stationary or local EM wave. The other is a radiating EM wave. In this paper we made various fractured borehole models with artificial materials or natural rocks and measure the electric field generated a seismic source in a water-filled borehole. The experimental results show that the Stoneley wave generates a radiating EM wave on the fracture, which propagates with light speed in the borehole. And the Stoneley wave also generates a stationary EM wave at the borehole wall. When the aperture of the fracture increases, the amplitude of the seismoelectric wave decreases due to the low ion concentration in the fracture. Comparing with the acoustic waveforms in the same borehole, the seismoelectric waveforms have more advantages for determining and characterizing a fracture or fractured zone intersecting a borehole.
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