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3D Full Wavefield Imaging of Up and Down-Going VSP Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
Borehole-related seismic data has a broader frequency band and better quality mainly because of the single propagation through a possibly unconsolidated near-surface area, resulting in a high-resolution image. However, it is common practice within our industry to utilize only the primary up-going wavefield to produce and image of the subsurface. Usually, the up- and down-going wavefields present in the 3D VSP data are separated and multiple scattering is attenuated prior to the imaging process. This means that a lot of valuable information is neglected. In this paper we will demonstrate the significant value of the down-going wavefield and multiple scattering in a closed-loop imaging process, as proposed by full wavefield migration. By including all multiple scattering available in the VSP data and closing the imaging loop, a true amplitude reflectivity image will be obtained with high resolution and maximum lateral extent.