Application of modified AOGST to study the low frequency shadow zone in a gas reservoir
| Autor: | B Abdollahi Aghdam, M. Ali Riahi |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Mathematical optimization
Engineering business.industry Shadow zone Geology Bilinear time–frequency distribution Management Monitoring Policy and Law Low frequency Generalized s transform Industrial and Manufacturing Engineering Geophysics Robustness (computer science) business S transform Algorithm |
| Zdroj: | Journal of Geophysics and Engineering. 12:770-779 |
| ISSN: | 1742-2140 1742-2132 |
| DOI: | 10.1088/1742-2132/12/5/770 |
| Popis: | The adaptive optimized window generalized S transform (AOGST) variant with frequency and time is a method for the time–frequency mapping of a signal. According to the AOGST method, an optimized regulation factor is calculated based on the energy concentration of the S transform. The value of this factor is 1 for standard S transform where in the AOGST method its value is limited by the interval of [0, 1]. However, AOGST may not produce an acceptable resolution for all parts of the time–frequency representation. We applied aggregation of confined interval-adaptive optimized generalized S transforms (ACI-AOGST) instead of the AOGST method. The proposed method applies the modified AOGST method to specific frequency and time intervals. By calculating regulation factors for limited frequency and time intervals of signal, arranging them in a suitable order and applying the ACI-AOGST one can provide a transformation with lowest distortion and highest resolution in comparison to other transformations. The proposed method has been used to analyse the time–frequency distribution of a synthetic signal as well as a real 2D seismic section of a producing gas reservoir located south of Iran. The results confirmed the robustness of the ACI-AOGST method. |
| Databáze: | OpenAIRE |
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