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