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Before petroleum technicians can begin work on an oil reservoir, prospective sites must first be sought by geological exploration teams. These crews perform seismic surveying, in which sound waves are created and their reflection from underground rocks recorded by seismographs, to help locate potential sources of oil. Other team members collect and examine geological data or test geological samples to determine petroleum and mineral content. They may also use surveying and mapping instruments and techniques to locate and map test holes or the results of seismic tests.