The image of the target in this case study is affected by zones of shallow gas/high Earth attenuation in the overburden. The goal of the study is to determine whether the imaging of the seismic below these areas can be improved through the application of advanced acquisition designs, eg. increased azimuth, long offset acquisition. Following the successful completion of a proof of concept test using a realistic synthetic model, illumination analyses were carried out over the survey area to determine the illumination characteristics of the legacy survey and the circular shooting acquisition to help understand the impact of the shallow gas bodies on the amplitude across the target horizons. The non-conventional circular acquisition approach has the potential to improve upon the azimuthal sampling achievable with the traditional straight line narrow azimuth survey. To determine the relative benefits of the full azimuth approach against the narrow azimuth legacy data for this specific area, additional target orientated analysis was conducted. This consisted of establishing the full range of reflector dips and azimuths (outside of those in the existing structural model) which could be imaged by each technique combined with simulating local PSDM images for the key areas of interest.


Article metrics loading...

Loading full text...

Full text loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error