In oil exploration today, many easy targets are exhausted and seismic imaging is often relied on in areas that suffer from variable illumination due to complex overburden heterogeneity. At the same time, seismic data are increasingly expected to reveal subsurface rock properties and fluid information. To achieve this, rock physics analysis and property estimation using seismic inversion are essential, but these methods assume that changes in seismic amplitudes reflect changes in lithology, which may not be the case for an onshore seismic dataset formed from a merge of different acquisitions and affected by complex overthrust with large velocity contrasts. In this case study we demonstrate how least-squares migration in the image domain was successful in improving seismic images and inversion results for an onshore Mexico project.


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