Changes

  | isbn    = 0891816607

  | isbn    = 0891816607

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The more control the geoscientist has in mapping the subsurface, the greater the accuracy of the maps. Control can be increased by the correlation of seismic data with borehole data. The synthetic seismogram (often called simply the “synthetic”) is the primary means of obtaining this correlation.

The more control the geoscientist has in mapping the subsurface, the greater the accuracy of the maps. Control can be increased by the correlation of [[seismic data]] with borehole data. The synthetic seismogram (often called simply the “synthetic”) is the primary means of obtaining this correlation.

Velocity data from the sonic log (and the [[density log]], if available) are used to create a synthetic seismic trace. This trace closely approximates a trace from a seismic line that passes close to the well in which the logs were acquired. The synthetic then correlates with both the seismic data and the well log from which it was generated.

Velocity data from the sonic log (and the [[density log]], if available) are used to create a synthetic seismic trace. This trace closely approximates a trace from a seismic line that passes close to the well in which the logs were acquired. The synthetic then correlates with both the seismic data and the well log from which it was generated.

  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

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Once a stratigraphic model has been built using velocities and densities, a synthetic seismogram (or synthetic) can be constructed to identify seismic reflections. A synthetic seismogram is the fundamental link between well data and seismic data, and it is the main tool (along with a [[Checkshots_and_vertical_seismic_profiles#Vertical_seismic_profiles|vertical seismic profile [VSP]]], if available) that allows geological picks to be associated with reflections in the seismic data. As discussed, if a VSP is available for a particular well, a synthetic is not needed. The VSP directly measures both time and depth to a formation of interest. Usually synthetic seismograms are created using specialized software. The user may be unaware of the process that creates them. The steps necessary to create a synthetic seismogram manually are described below:

Once a stratigraphic model has been built using velocities and densities, a synthetic seismogram (or synthetic) can be constructed to identify seismic reflections. A synthetic seismogram is the fundamental link between well data and [[seismic data]], and it is the main tool (along with a [[Checkshots_and_vertical_seismic_profiles#Vertical_seismic_profiles|vertical seismic profile [VSP]]], if available) that allows geological picks to be associated with reflections in the seismic data. As discussed, if a VSP is available for a particular well, a synthetic is not needed. The VSP directly measures both time and depth to a formation of interest. Usually synthetic seismograms are created using specialized software. The user may be unaware of the process that creates them. The steps necessary to create a synthetic seismogram manually are described below:

# Edit the sonic and density logs for bad intervals.

# Edit the sonic and density logs for bad intervals.