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Интеллектуальная Система Тематического Исследования НАукометрических данных |
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Characteristics of elastic properties of the crystalline rock samples from the Outokumpu deep drill hole: results of acoustopolariscopic laboratory measurementsстатья
- Авторы: Gorbatsevich F.F., Kovalevsky M.V., Trishina O.M.
- Журнал: Outokumpu Deep Drilling Project 2003-2010
- Том: 2011
- Год издания: 2011
- Первая страница: 207
- Последняя страница: 218
- Аннотация: We present the results of laboratory measurements of the elastic and nonelastic properties of drill core samples from depths of 94-2298 m in the Outokumpu Deep Drill Hole, eastern Finland. A total of 43 cubic rock samples were prepared (30-40 mm side length) and measured with the method of acoustopolariscopy under ambient conditions. In addition, the average velocities were calculated from the modal composition of the rocks. The measurement results provide the complete velocity matrices of the samples with the main components of P-waves as well as S-waves and their anisotropy factors. From the surface down to a depth of ∼1300 m (mostly metasediments), the Outokumpu rocks were found to be strongly anisotropic. The lowest measured anisotropy values were observed in the ∼1300-1600 m depth range (ophiolite-derived altered ultramafic rocks and metasediments). In the lower part of the hole from 1600 m to the hole bottom (metasediments and pegmatitic granite), the velocity anisotropy was variable. The effect of linear acoustic anisotropic absorption (LAAA) is exhibited in samples from the upper and lower sections of the drill hole. We attribute the variations in P- and S-wave velocities and their anisotropies to the variation in rock types and the drilling-induced relaxation of pressure (and to a minor degree temperature), which has resulted in decompaction and the formation of micro-cracks in the drill core. Therefore, a linear decrease in seismic velocities as a function of depth is observed in the laboratory measurements.
- Добавил в систему: Ковалевский Михаил Васильевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | 2011-01_koval.pdf | 5,4 МБ | 24 ноября 2022 [KovalevskiiMV] |