The concept of crosswell or cross borehole logging was introduced as early as 1929 when crosswell seismics were proposed in oilfield exploration. In the early 1980's, the introduction of new technologies made the use of crosswell logging feasible for application to petroleum, minerals (including coal mining), and geotechnical problems. At least two groups, bhp engineering and bolt geophysical, have now announced the commercial availability of crosswell seismic tomography services for the minerals industry.
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