Bulletin du Service Géologique de l'Algérie
Volume 14, Numéro 2, Pages 119-138
2003-07-01
Characterization Of A Reservoir In A South Algerian Prospect Using The Instantaneous Seismic Attributes : Efficiency And Reliability Of The Instantaneous Frequency Parameter Using The Joint Time-frequency Analysis
Authors : Aitouche Moh-amokrane . Djeddi Mounir . Djeddi Mabrouk . Mihoubi Abdelhafid .
Abstract
Present day, exploration for oil and gas requires a combined effort based on the successful integration of the most part of geophysical methods for optimizing the location of data acquisition, identifying and evaluating the productive potential of unexplored regions or extending existing productive traps. Exploration seismology has been focussed on imaging the structural features of the Earth s subsurface.This approach is now commonplace in most seismic evaluation project due to the ability of this technique under favorable hypothesis to predict reservoirs properties (depth, lateral extension, discrimination between reservoir fluids...). However, after the fantastic software improvement, new robust processing tools (principally in signal processing techniques) have been developed for extracting indirect information provided by structure imaging. These new tools can significantly increase the probability of success associated with a given project. In this context, the success of direct hydrocarbons detection is primary due to the identification of large negative amplitudes known as bright spot which can define a necessary but not sufficient condition for identifying oil and gas pitfalls. Robust methods involve computed and correlated sesimic attributes such as the instantaneous ones (intantaneous phase, instantaneous frequency, instantaneous amplitude, inversion polarity...) have enjoyed in many cases considerable success for characterizing potential hydrocarbon traps. In the present work, we have precisely used a set of instantaneous attributes to characterize a reservoir located in a permit of the South Algerian Sahara. However, we take the following question : how about the efficiency and the reliability of each instantaneous seismic attribute ? To do this, the instantaneous frequency parameter has been selected because it provides wer indicator of the variations in the energy distribution of the seismic signal, principally oisy environment. More recently, adapted signal processing tools are performed ; one can the joint time-frequency analysis and its corollaries the Wigner-Ville Distribution, the ner bispectrum and the Pseudo-Wigner-Ville representation which are simultaneously d in the present work on a noisy hyperbolic swept frequency signal.
Keywords
Reservoir- bright spot - Seismic attributes- Instantaneous phase - Instantaneous frequency- Instantaneousamplitude- Apparent polarity - Wigner-Ville Distribution
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