English to Russian Tech/Engineering Geology сейсмическая разведка

[0046] In some sense, each frequency sub-band can be viewed as its own survey with its own spatial sampling requirements, and so will have its own particular preferred inline and crossline shot-spacing requirements. In some variations there will be no need for shots in different frequency sub-bands to use the same acquisition grid (although this might be done in some cases for processing and/or acquisition convenience). In a marine survey, the inline shot spacing may easily be customized simply by choosing a different source repeat interval time. Crossline shot spacing is less conveniently varied, but could be achieved by, for example, alternating lines shot using just the higher-frequency sub-band sources with lines shot using sources covering all the sub-bands. In this way, the higher-frequency sub-band sources would have half the crossline spacing of the others. In a marine case, when working out the sampling requirements for each sub-band, 240, each sub-band source will typically be towed at its own optimal depth. See, for example, Laws, R., and Morice, S. P., 2007, Method of seismic surveying, a marine vibrator arrangement, and a method of calculating the depths of sources: patent US 7,257,049 B1, herein incorporated by reference in its entirety for all purposes.

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