TY - GEN

T1 - Velocity analysis for VSP data using multiples

AU - Nasyrov, Denis

AU - Kiyashchenko, Denis

AU - Kiselev, Yurii

AU - Kashtan, Boris

AU - Troyan, Vladimir

PY - 2018/1/1

Y1 - 2018/1/1

N2 - The quality of the subsurface images obtained using VSP data strongly depends on the velocity model used for migration. The velocity model derived from surface seismic is often not accurate enough for VSP imaging and there is a need for its improvement. We propose the method for updating of velocities using VSP data. The main idea is to use the images of the subsurface obtained using different types of waves: primary reflections and surface-related multiples. If the background velocity is correct, then these images will be similar, and they will not coincide, if the velocity model is erroneous. We develop the algorithm of velocity updating based on this criterion. The proposed method allows us to retrieve the velocity below the borehole receivers. This is complementary to first break VSP travel time tomography, which helps to retrieve velocity only above the receivers.

AB - The quality of the subsurface images obtained using VSP data strongly depends on the velocity model used for migration. The velocity model derived from surface seismic is often not accurate enough for VSP imaging and there is a need for its improvement. We propose the method for updating of velocities using VSP data. The main idea is to use the images of the subsurface obtained using different types of waves: primary reflections and surface-related multiples. If the background velocity is correct, then these images will be similar, and they will not coincide, if the velocity model is erroneous. We develop the algorithm of velocity updating based on this criterion. The proposed method allows us to retrieve the velocity below the borehole receivers. This is complementary to first break VSP travel time tomography, which helps to retrieve velocity only above the receivers.

UR - http://www.scopus.com/inward/record.url?scp=85059096356&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:85059096356

SN - 9781605607856

T3 - 78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008

SP - 3420

EP - 3424

BT - 78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008

PB - Society of Exploration Geophysicists

T2 - 78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008

Y2 - 9 November 2008 through 14 November 2008

ER -