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Results
Method Both AVO and reflection tomography require that rays be traced from the image point back to the individual sources Our procedure consists of estimating the dip field, and receivers that contributed to this image. This requires conditioning the dip field, resolving the acquisition knowledge of both the reflector dip at the image point, and azimuth, and then incorporating the dip and azimuth in the the acquisition azimuth. In practice, this ray tracing is often ray tracing from the image point back to the surface for done assuming zero dip and zero azimuth. This can lead to each offset.
Single-well Imaging Using the Full Waveform of an Acoustic Sonic
Chabot, L. (CREWES Project, University of Calgary, Canada) | Henley, D.C. (CREWES Project, University of Calgary, Canada) | Brown, R.J. (CREWES Project, University of Calgary, Canada) | Bancroft, J.C. (CREWES Project, University of Calgary, Canada)
ABSTRACT This work evaluates single-well imaging using the full waveform acquired by an acoustic well-logging tool. It begins by reviewing wave propagation in a fluid-filled borehole. Next we introduce a waveform processing flow using known seismic processing methods and apply it to a real field data set. The ultimate goal of this work is to image scattered energy beyond the borehole wall and thus gain a better picture of the reservoir characteristics around the borehole.
- North America > Canada > Alberta (0.48)
- North America > United States > Texas (0.31)
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying > Seismic Processing > Seismic Migration (0.99)
- Geophysics > Seismic Surveying > Borehole Seismic Surveying (0.94)
- North America > Canada > Saskatchewan > Western Canada Sedimentary Basin > Alberta Basin > Viking Formation (0.99)
- North America > Canada > Alberta > Western Canada Sedimentary Basin > Alberta Basin > Viking Formation (0.99)
- North America > Canada > Alberta > Western Canada Sedimentary Basin > Alberta Basin > Blackfoot Field > Blackfoot Reserv. 10 Th 14-19-22-23 Well (0.99)
Summary A new 2-D common-offset prestack time migration algorithm is presented. In the prestack time migration the formula of poststack phase shift migration is generalized to common-offset section for constant-velocity medium. These formulae of phase shift migration of common offset sections are obtained using numerical fitting method. This migration method takes into account vertically varying velocity by using average velocity. Theoretically, these formulae are accurate only when velocity is constant. However, synthetic and real examples indicate that data with even reasonably rapidly vertical velocity variation can be imaged effectively. One important feature of the proposed method is significantly to reduce computation cost.
ABSTRACT Assuming a scatter point located beneath a stack of layers with vertical transverse isotropy (VTI), we derive an accurate double-square-root (DSR) converted-wave (Cwave) diffraction equation, and incorporate the equation into the Kirchhoff prestack time migration. The DSR is controlled by five parameters: P- and S-wave stacking velocities VP2 and VS2, vertical velocity ratio ?0, and anisotropic parameters ?eff and ?eff, which define the anisotropic velocity model for migration. We demonstrate using real data how to build the anisotropic model from reflection moveout analysis, and evaluate the merit of prestack time migration. The DSR equation has a similar form to its isotropic counterpart, which allows an efficient implementation of prestack time migration. Applications to real data show that the C-wave imaging obtained by the new approach is more focused and coherent than the imaging by isotropic methods.
- Europe > United Kingdom (0.71)
- North America > United States > Texas (0.32)
- Geophysics > Seismic Surveying > Seismic Processing > Seismic Migration (1.00)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling > Seismic Anisotropy (0.34)
- Europe > United Kingdom > North Sea > Central North Sea > Moray Firth > Moray Firth Basin > Moray Firth Basin > Witch Ground Graben > P.213 > Block 16/26a > Brae Field > Alba Field > Caran Sandstone Formation (0.99)
- Europe > United Kingdom > North Sea > Central North Sea > Moray Firth > Moray Firth Basin > Moray Firth Basin > Witch Ground Graben > P.213 > Block 16/26a > Brae Field > Alba Field > Alba Sandstone Formation (0.99)
- Europe > United Kingdom > North Sea > Central North Sea > Moray Firth > Moray Firth Basin > Fladen Ground Spur > Witch Ground Graben > P.213 > Block 16/26a > Brae Field > Alba Field > Caran Sandstone Formation (0.99)
- Europe > United Kingdom > North Sea > Central North Sea > Moray Firth > Moray Firth Basin > Fladen Ground Spur > Witch Ground Graben > P.213 > Block 16/26a > Brae Field > Alba Field > Alba Sandstone Formation (0.99)