A numerical investigation on wide-line seismic data acquisition and processing
HE Baoqing1,2, XIE Xiaobi2
1. Acquisition Technique Center, BGP Inc, CNPC, Zhuozhou, Hebei 072751, China; 2. Institute of Geophysics and Planetary Physics, University of California, Santa Cruz, CA 95064, U S A
Abstract：The wide-line is a way between 2D and 3D seismic survey.In this paper, we investigate the wide-line seismic method with both theoretical analysis and numerical simulations.Response functions of a wide-line acquisition system for both monotonic signals and broad band signals are calculated for different parameters commonly used in the acquisition.To numerically simulate the entire process including the acquisition and data processing, we generate synthetic 3D narrow azimuth data using the full-wave finite-difference method, conduct wide-line processing, and finally use the 2D reverse time migration to generate the depth image.Horizontal structures, dipping structures, and a near-surface scattering layer are built into a 3D model to study the advantages of the wide-line method.Benefitted from the flexibility of the numerical calculation, we can adjust acquisition geometry parameters in a large range and test their effects on the image results.In particular, we investigate the mechanisms how various wide-line parameters, including line spacing, number of lines, aperture, and signal frequency band, will affect the migration image.Based on our analysis, a geometry with 120~200m aperture and 3~5 receiver lines is most advantageous for suppressing lateral interference.Our study may provide a reliable basis for more efficient use of wide-line seismic method.
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