| Abstract: | Existing techniques for the quantitative interpretation of waveform data have been based on one of two fundamental approaches: (1) simultaneous identification of compressional and shear velocities; and (2) least-squares minimization of the difference between experimental waveforms and synthetic seismograms. Techniques based on the first approach do not always work, and those based on the second seem too numerically cumbersome for routine application during data processing. An alternative approach is tested here, in which synthetic waveforms are used to predict relative mode excitation in the composite waveform. Synthetic waveforms are generated for a series of lithologies ranging from hard, crystalline rocks (Vp equals 6. 0 km/sec. and Poisson‘s ratio equals 0. 20) to soft, argillaceous sediments (Vp equals 1. 8 km/sec. and Poisson‘s ratio equals 0. 40). The series of waveforms illustrates a continuous change within this range of rock properties. Mode energy within characteristic velocity windows is computed for each of the modes in the set of synthetic waveforms. The results indicate that there is a consistent variation in mode excitation in lithology space that can be used to construct a unique relationship between relative mode excitation and lithology. |
| Genre: | Article |
| ProdID: | 70015136 |
| Citation Author: | Paillet, F. L.; Cheng, C. H.; Meredith, J. A. |
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| Citation End Page: | 320 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Log Analyst |
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| Citation Number Of Pages: | 14 |
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| Citation Search Results Text: | NEW APPLICATIONS IN THE INVERSION OF ACOUSTIC FULL WAVEFORM LOGS - RELATING MODE EXCITATION TO LITHOLOGY.; 1987; Article; Journal; Log Analyst; Paillet, F. L.; Cheng, C. H.; Meredith, J. A. |
| Citation Start Page: | 307 |
| Citation Volume: | 28 |
| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | NEW APPLICATIONS IN THE INVERSION OF ACOUSTIC FULL WAVEFORM LOGS - RELATING MODE EXCITATION TO LITHOLOGY.; 1987; Article; Journal; Log Analyst; Paillet, F. L.; Cheng, C. H.; Meredith, J. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1987 00:00 -0600 |
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