Uphole rig, Libya
Uphole rig in Libya

Uphole rig, Libya

Mayhew 1000 drilling rig in Libya
Mayhew 1000 in

When I first went to in 1984 I was an ‘Assistant Seismologist'. My job function was to determine the static corrections needed to apply to the seismic data so it all made sense in the processing cycle. To do this we had a couple of Mayhew 1000 drilling rigs mounted on Belgian MOL trucks. They'd go out to the location we directed and drill typically a 10 cm diameter hole to a depth of up to 100 meters. I'd then lower a down the hole, hit a metal strike plate with a sledge hammer and record the travel time of the sound wave. I'd then pick the up 5 meters and strike the ground again, repeating this till the was back on the surface. Back in I'd then get out th graph paper and plot the time and distance chart to develop a surface velocity model and from that, calculate the static corrections.

This image was taken in 1985 in the dunes about 50 km west of Maradah, on Fujichrome Velvia using an rangefinder point-and-shoot camera.