Efficient High-Resolution Seismic Data for Near-Surface Corrections
Tariq Alkhalifa1*, Ramzy AlZayer2, and Majed AlMalki1
1KACST, Saudi Arabia
Accurate corrections for topography and near-surface complexities of surface seismic data from the Arabian Peninsula require accurate modeling of the near-surface and an effective correction algorithm that uses of the model. Refraction and residual statics-based modeling, though they help improve results, have fallen short of what is required in complex regions in the area. In fact, almost all the existing near-surface correction methods require an accu-rate near-surface velocity model. In some cases, however, the model is impossible to esti-mate from conventional low-resolution seismic data in which the near-surface inhomoge-neities occur within the near-field region of wave propagation. Through numerical model-ing, we show that a reasonably accurate shallow-velocity model can be obtained from ap-plying conventional horizon-based velocity analysis on shallow high-resolution seismic data. The model proved to be effective in correcting the conventional deep seismic image using either the simple static shifts or wave-equation datuming. We also present a novel idea to acquire high-resolution shallow seismic data in a cost-effective way. The novelty of the approach is in the spacing of the receivers, in which we used conventional acquisition configurations to acquire the high-resolution data with minimal additional cost. We investi-gated the resolution limits achieved from conventional configurations. A real experiment in the Riyadh region shows the possible resolution limits obtainable using this approach.
AAPG Search and Discovery Article #90077©2008 GEO 2008 Middle East Conference and Exhibition, Manama, Bahrain