Refraction velocities of trap basalts |
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| Authors: | S Varadarajan G N Behl |
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| Institution: | 1. Research and Training Institute, Oil and Natural Gas Commission, Dehra Dun
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| Abstract: | Refraction surveys conducted by the Oil & Natural Gas Commission in the Cambay Basin, Gujarat, Rajahmundry area, Andhra Pradesh and near Rajamahal Traps, West Bengal, have indicated longitudinal velocities of the order of 4.2 to 5.8 km/sec for the Traps. Measurements of velocities by Sonic log in wells drilled for oil in the Cambay basin yielded values, ranging from 4.8 to 5.1 km/sec. While Sonic log velocities compare well with field refraction measurements, published values for trap basalt determined in the laboratories in India by various workers indicate a consistently high value of 6.6–7.2 km/sec. The distinctly lower value obtained by refraction methods can be attributed to weathering effects, thickness of trap flows, unsuspected inter-trappeans, dispersion in layered rocks etc. The mean values for the Traps of the Cambay, Rajamundry and Rajmahal areas come out to 4.78, 4.10 and 4.81 km/sec respectively. |
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