Configuration of source and receiver lines for 3-dimensional seismic acquisition

摘要

A method for performing a seismic survey with even fold. An inline direction and a crossline direction are selected. Seismic signals are generated at a plurality of source locations positioned along one or more source lines. The source locations are substantially equally spaced, and the source lines are substantially parallel to each other. Seismic signals are detected at a plurality of receiver locations positioned along a plurality of receiver paths having longitudinal axes parallel to the inline direction, and substantially equally spaced in each receiver path. Each receiver path is positioned along its axis, and extends in a regular pattern on both sides of the axis. The axes are substantially parallel to each other. A desired fold, F.sub.i, is determined in the inline direction, and a desired fold, F.sub.x, is determined in the crossline direction. A number of receiver channels, NC.sub.i, per receiver path in the inline direction, a spacing, RI.sub.i, between receiver locations in the inline direction, a number, NRL.sub.x, of receiver paths in the crossline direction, and a number, NS.sub.x, of source locations in the crossline direction are determined. Spacing, SI. sub.i, between source locations in the inline direction satisfying the expression F.sub.i =(NC.sub.i ×RI.sub.i)/(2×SI.sub.i), and spacing, SI.sub.x between source locations in the crossline direction, and distance, R.sub.x, rolled in the crossline direction which satisfy the expression F.sub.x =(NRL.sub.x ×NS.sub.x ×SI.sub.x)/(2. times.R.sub.x) are selected.