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Abstract: <br /> <br /> <br /> <br /> <br /> <br /> <br /> Attenuation is a phenomenon representing energy loses due to the effect of decreasing amplitude and frequency absorption in simultaneous by passed medium. In the field of geophysics, especi...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/9641 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Abstract: <br />
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Attenuation is a phenomenon representing energy loses due to the effect of decreasing amplitude and frequency absorption in simultaneous by passed medium. In the field of geophysics, especially in sub-surface exploration with seismic method, attenuation phenomenon is very important to be studied. Seismic quality factor or Q factor is a parameter showing the level of wavelet energy absorption in rock medium. Energy dissipation factor (with notation of Q-1) shows the level of mechanic energy conversion of the wave which it turned into heat. This factor is very sensitive to rock type and fluid content also. <br />
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The main target of this research is to calculate seismic quality factor value as gas zone indicator from seismic data. This research used complex trace attributes and spectral ratio methods to calculate Q, which is related to existence of gas zone. Before applied to the field data, the methods of Q estimation were tested with synthetic data. Result of this research at synthetic seismic data indicate that seismic quality factor value can be used to determined weak and strong level of attenuation, which related to existence of gas zone. Furthermore, the methods were applied at field data. This result showed that strong attenuation zone was related to presence of gas reservoir. <br />
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