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A Well Driven Previous HitProcessingNext Hit Approach for Seismic Imaging of Subtle Traps

By

 Ahmed Abdou1, Tarek Nafie2, Ayman Shabrawi2

(1) Khalda Petroleum Company, Cairo, Egypt (2) WesternGeco, N/A, Egypt

 At present the choice of both Previous HitprocessingNext Hit sequence and seismic Previous HitprocessingNext Hit parameters relies on the skills and experience on the part of the Previous HitprocessingNext Hit analyst. Typically, Previous HitprocessingNext Hit parameters selection is performed by inspection and subjective judgment of seismic Previous HitdataNext Hit processed through a variety of Previous HitprocessingNext Hit steps and parameters. However, examination of this conventional Previous HitprocessingNext Hit technique shows that it fails in many cases to provide a good tie with borehole seismic Previous HitdataNext Hit, which in turn does not allow reliable interpretation of the seismic Previous HitdataNext Hit. This paper demonstrates an alternative Previous HitprocessingNext Hit technique for integrating borehole Previous HitdataNext Hit into the Previous HitprocessingNext Hit parameters selection from the earliest stage of the Previous HitprocessingNext Hit. The present Previous HitprocessingNext Hit technique is based upon (1) proper editing of the well acoustic Previous HitdataNext Hit (sonic and density). The log editing is based on multi-log approach and is carried out interactively and by direct interaction between borehole and seismic Previous HitdataNext Hit, and (2) quantitative and objective evaluation of the Previous HitprocessingNext Hit parameters selection obtained from the integration of borehole and seismic Previous HitdataNext Hit by means of statistical attributes calculation of the extracted wavelets. These attributes values define both the best correlation between the well trace and the corresponding seismic trace and the complexity of the extracted wavelet. The present Previous HitprocessingNext Hit technique is illustrated with Previous HitdataNext Hit from an oil field from the Egyptian Western Desert. Benchmark results have proven the superiority of seismic imaging results obtained by the present Previous HitprocessingNext Hit technique with respect to that obtained by the conventional Previous HitprocessingNext Hit. The present methodology offers two major advantages over the conventional Previous HitprocessingNext Hit approach. First, seismic Previous HitdataNext Hit shows a better focusing of the fault shadows and more certainty of the fault pattern alignments. Second, it provided an improvement in the tie between the surface and the borehole seismic Previous HitdataNext Hit so that events on the processed seismic Previous HitdataTop can be easily identified in terms of polarity and time.