Job description
Changes in the Earth's subsurface, including those affecting CO2 levels, are usually very subtle. Monitoring additional measurements, such as pressure and particle velocity, aids in detecting these subtle changes, whether natural or manmade, and in differentiating effects.
From land seismic experience, it is known that pressure measurements under the water table (with hydrophones) are best for obtaining P-wave information, since they measure the fluid pressure variations and are therefore insensitive to S-wave information. As may be clear from this, S-wave information needs to be obtained from particle velocity measurements (with geophones).
For non-porous, homogeneous media, there is some redundancy in the combined pressure and particle velocity measurements. However, pressure measurements are mainly sensitive to the water phase, and therefore a porous media approach needs to be taken to explain such measurements. The obvious approach is low-frequency Biot theory, with the inclusion of a gas phase, and this is used for modelling and processing.
From land seismic experience, it is known that pressure measurements under the water table (with hydrophones) are best for obtaining P-wave information, since they measure the fluid pressure variations and are therefore insensitive to S-wave information. As may be clear from this, S-wave information needs to be obtained from particle velocity measurements (with geophones).
For non-porous, homogeneous media, there is some redundancy in the combined pressure and particle velocity measurements. However, pressure measurements are mainly sensitive to the water phase, and therefore a porous media approach needs to be taken to explain such measurements. The obvious approach is low-frequency Biot theory, with the inclusion of a gas phase, and this is used for modelling and processing.
As part of this work, low-frequency, finite-difference modelling of wave propagation in porous media needs to be developed. This type of modelling inherently includes the aforementioned items (4C recordings, porous media). The combined measurements will be used for a better wave-field decomposition into P- and S-wave potentials, thereby separating the P- and S-wave information, needed for characterising the (porous) subsurface.
Requirements
The candidate should have a strong background in theoretical geophysics, be familiar with numerical methods for modelling and optimisation, and have ample programming experience.
Conditions of employment
TU Delft offers an attractive benefits package, including a flexible work week, free high-speed Internet access from home, and the option of assembling a customised compensation and benefits package (the 'IKA'). Salary and benefits are in accordance with the Collective Labour Agreement for Dutch Universities.
Information and application
For more information about this position, please contact Guy Drijkoningen, phone: +31 (0)15-2787846, e-mail: g.g.drijkoningen@tudelft.nl. To apply, please e-mail a detailed CV, publications list, references and a letter of application by 11 March 2011 to W. A. Maertens, Recruitment-CiTG@tudelft.nl.
When applying for this position, make sure to mention vacancy number CITG11-10.
When applying for this position, make sure to mention vacancy number CITG11-10.
Factsheet
| Department/faculty | Civil Engineering and Geosciences |
|---|---|
| Level | Master degree |
| Hours per week | 38 |
| Location | Delft |
| Contract | 4 years |
| Salary | €2042 to €2612 per month gross |
| Closing date | 11-03-2011 |
| Vacancy nr. | CITG11-10 |
Information
For more information about this job, please contact Guy Drijkoningen, Associate Professor.
For more information about the application procedure, please contact W. A. Maertens/HRM.
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