![]() Around 80% of acoustic signal distortion comes from propagating through the top 100 metres of ground, with the most problems encountered nearest the surface. To achieve high-fidelity reservoir characterisation, the surveyors aim to exclude as many variables as possible. "Depending on the target, the trucks can be tuned to work across a pre-defined frequency spectrum, providing 'multicoloured' views in terms of elastic waves." ![]() "The vibroseis method uses trucks with heavy masses and baseplates that vibrate the ground to provide a far more controlled source," Laake explains. What Earth Observation can provide is a detailed preview of a region's topography and geology, valuable for assessing areas that will produce the best and worst seismic quality – meaning the sending and receiving of vibration signals – far in advance of commencing the survey.Ĭrew deploying geophones in the Middle East Seismic surveyor WesternGeco, has been working with ESA for the last three years to integrate satellite data into its working practices. Often carried out in the remotest parts of the planet, these surveys are almost military in scale and expense a seismic crew exploring a 500-square-kilometre area can require 400 people with up to 50 small and 15 large vehicles working with up to 600,000 geophones, and carrying out 600 seismic 'shots' daily. ![]() ![]() ![]() Today, seismic surveys planned with satellites are yielding clearer, deeper subterranean views at reduced cost. Modern methods include large vibrator trucks and many thousands of surface sensors called geophones, all precisely located to obtain the most useful information with which to explore for hydrocarbons. ![]()
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