Seismic Reprocessing Overcomes Uncertainty in Offshore Egyptian Field

The authors of this paper describe a seismic reprocessing campaign for an Egyptian oil field that had yielded poor seismic data.

February 1, 2024

Journal of Petroleum Technology

Fig. 1—New depth CRAM slice (left) vs. legacy depth Kirchhoff isotropic image (right). The new CRAM image with new PSDM data showed high and strong amplitude extending toward the north and west portions of the field.

The ASH oil field is in the eastern portion of the AG Basin in Egypt. The Lower Cretaceous Alam El Bueib is the main oil-producing formation. Because of the high heterogeneity of the Abu Roash succession, in addition to the influence of thick limestone of the Upper Cretaceous and the influence of multiple complex faults, the quality of seismic data is very poor, requiring seismic reprocessing. Two key techniques were used to achieve the goal: New vertical seismic profile (VSP) well data were acquired to adjust the velocity model, and common reflection angle migration (CRAM) prestack depth migration (PSDM) was used for reprocessing.

Introduction

The ASH field produces oil from the Aptian Lower Cretaceous reservoir.

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