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oa Proper Treatment of Amplitude and Phase of Seismic Data for Preserving Geology
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, PGCE 2004, Dec 2004, cp-259-00001
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Abstract
Preserving the amplitude and phase of Seismic data is of paramount importance in modem day data analysis and subsequent evaluation. Unlike previous years where the Seismic was used only to image and map structures, modem application ranges from lithology , fluid and pressure prediction, rock-property analysis extending as far as to reservoir and fluid monitoring (4D) at production stage .The processed and imaged seismic section has to represent geology. The high quality of modem 3D seismic data is enabling us to confirm old geological ideas and develop new concepts and models, particularly of deep water turbidtic depositional system. The data work flow we adopt in Carigali today , in order to meet this objective, would be to follow wave phenomena and <br>correct in a deterministic manner all the earth propagation and filtering effects. A seismic pulse is represented by its arrival time (T), its amplitude (A) and phase (phi). Currently we are generally using only T to map the structures and (sometimes) the amplitude to create amplitude maps. However, we should emphasize also the importance of phase information in seismic to well correlation, coherency sections for fault delineation and dip azimuth in fracture studies. Phase along with polarity is of significance in discriminating a hard from a soft impedance, in discriminating sands from shale’s or in flat spot identification. Likewise, another variable frequency defines resolution aspects in our ability to detect thin beds.