What if I...? - The Use of Vibroseis 'Energy Tests'as an Aid in Parameter Choice

摘要

A core component in planning a land seismic survey is the choice of source and its parameters. Parameterstests are often performed as part of the survey start-up, but Interpretation of the results from these tests isfrequently subjective, particularly when a complete line or swath is not acquired and processed. Thetypical instinct is to err on the side of caution and this may result in the application of an excessive amountof source energy, thus negatively impacting survey efficiency and cost. However, the effect from differentsources and source parameters on signal-to-noise ratio and other key quality indicators can be tested andanalyzed in a systematic way. This will allow comparison of a much wider variety of source options thanis possible through the acquisition of a very limited number of costly and time-consuming test lines. Wecan also identify possible efficiency improvements resulting from acquiring data with equivalent signal-tonoiseratios, but different parameter combinations. A suite of such tests has been developed withinWesternGeco and are referred to as energy tests. Within this paper, we will describe the results from suchtests and its interpretation.