--> A Well Driven Processing Approach for Seismic Imaging of Subtle Traps
[First Hit]

Datapages, Inc.Print this page

A Well Driven Processing Approach for Previous HitSeismicNext Hit 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 processing sequence and Previous HitseismicNext Hit processing parameters relies on the skills and experience on the part of the processing analyst. Typically, processing parameters selection is performed by inspection and subjective judgment of Previous HitseismicNext Hit Previous HitdataNext Hit processed through a variety of processing steps and parameters. However, examination of this conventional processing technique shows that it fails in many cases to provide a good tie with borehole Previous HitseismicNext Hit Previous HitdataNext Hit, which in turn does not allow reliable interpretation of the Previous HitseismicNext Hit Previous HitdataNext Hit. This paper demonstrates an alternative processing technique for integrating borehole Previous HitdataNext Hit into the processing parameters selection from the earliest stage of the processing. The present processing 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 Previous HitseismicNext Hit Previous HitdataNext Hit, and (2) quantitative and objective evaluation of the processing parameters selection obtained from the integration of borehole and Previous HitseismicNext Hit 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 Previous HitseismicNext Hit trace and the complexity of the extracted wavelet. The present processing technique is illustrated with Previous HitdataNext Hit from an oil field from the Egyptian Western Desert. Benchmark results have proven the superiority of Previous HitseismicNext Hit imaging results obtained by the present processing technique with respect to that obtained by the conventional processing. The present methodology offers two major advantages over the conventional processing approach. First, Previous HitseismicNext Hit 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 Previous HitseismicNext Hit Previous HitdataNext Hit so that events on the processed Previous HitseismicNext Hit Previous HitdataTop can be easily identified in terms of polarity and time.