1. Seismic-Well Tie Flow-Chart
Data
Data
Processing
Real Seismic
Trace
Estimate
Pulse
SLIDE 7
Here is a simple flow chart for performing a:well-seismic tie
At the top is our seismic data – the raw field data is processed to get us images of the subsurface
The processed data gives us a “real” seismic trace at the location of the well we want to tie
As part of the data processing, we can get an estimate of the shape of the seismic pulse
Near the bottom is the well data, which may need some processing/editing
The well data we need come from the sonic log (gives us velocity information) and one of several density logs
We may also have check shots from the well – more on check shots on the next slide
If we do not have an estimated pulse from the seismic data processing, we can use a standard (external) pulse shape of a user-defined phase and frequency
Computer programs combine the sonic and density log data with the estimated or external pulse to generate a “synthetic” or “modeled” seismic trace
We then compare the real and synthetic traces and note how well they match
If the match is good enough for our purposes, we can then relate one data set to the other – well to seismic OR seismic to well
External
Pulse
Well -
Seismic Tie
Well -
Seismic Tie
Well
Data
Data
Processing
Seismic
Modeling
Synthetic Seismic
Trace
Check Shots/
Time Depth
Information
Courtesy of ExxonMobil
L 7 – Well-Seismic 1