METHOD OF DETERMINING MERIT OF OFFSET AND AZIMUTH DISTRIBUTIONS IN SEISMIC DATA ACQUISITION

摘要

A planned survey comprises several lines of receivers, preferably bottom-fixed or otherwise maintaining a fixed position, in the survey area. The survey area is divided into a number of "bins" of a convenient shape and size, such as squares with a side equal to half the receiver spacing (when the receivers are equally spaced on the receiver lines). The data from the suite of shot and receiver positions are analyzed and all shot-receiver pairs that have a common sort point (CSP) are assigned to the spatial bin in which the CSP is located. The CSP maybe a common mid-point (CMP). The data within each bin are analyzed to give a figure of merit of the adequacy of the sampling for each bin. These figures of merit are displayed in a color display that makes the inadequacies of the sampling apparent, making it possible to modify the planned acquisition geometry prior to the actual deployment of the receiver lines. Alternatively, a figure of merit is determined for the overall survey. To facilitate the evaluation, a neural net may be trained to evaluate the survey based upon the figure of merit.