Imaging Improvements From Wideline Data in a Noisy Transition Zone Environment

Hall, Michael (Geokinetics Exploration Incorporated) | Lopez, David (Geokinetics) | Janex, Gael (Geokinetics) | Rosindell, Keith (Geokinetics)



Wideline acquisition techniques have previously been applied successfully to obtain improved seismic images in areas of poor signal to noise, or structural complexity, where 2D images alone were inadequate. Most such surveys have been conducted onshore with multiple source and multiple receiver lines. A wideline technique has been applied to a transition zone survey in an area with strong source generated noise, potential scattering from near surface anomalies, and moderate structural complexity. Two lines from a 2D transition zone survey were selected for testing this approach in which two additional source lines were acquired parallel to the conventional single source line, resulting in 3 CDP lines. Data processed to account for potential cross-dip in the reflections show considerable improvement in the continuity of deeper events in the zone of interest. Sources are inherently cheaper than receivers in the transition zone and the encouraging results of this test with just 3 CDP lines suggests that it would be a useful technique for application in many transition zone areas where obtaining adequate signal to noise is frequently a challenge.