Phd Position Salt Mechanics

3 weken geleden

Delft, Nederland TU Delft Voltijd

**PhD Position Salt Mechanics**:
**_Challenge: Quantifiying brittle behavior in salt caverns_**

**_Change: Monitor integrity via local seismic measurements_**

**_Impact: Safe abandonement of salt caverns_**

**Job description**:
This PhD project is a joint venture between Delft University of Technology and Nobian Industrial Chemicals B.V. Solution mining creates caverns in the subsurface, which may be re-used for pressurized air or H2 storage. The capacity of caverns to provide large-scale storage capacity is foreseen to play a major role in the energy transition.

Caverns should be abandoned such that any long-term effects at the surface are acceptable to all stakeholders. This requires evidence that any effects of mining can be properly monitored. While salt deformation is considered to be mainly governed by plastic deformation processes, (brittle) dilatancy within the rock salt adjacent to the cavern wall may occur under certain circumstances. If this localizes, a leakage path could theoretically emerge: a hydraulic fracture. Microseismic monitoring may be helpful as an early-warning system to avoid hydraulic fracturing. However, this hinges on if we can correlate the microphysical processes with the acoustic signature of salt. It has been shown for other rocks that the seismic signature of acoustic signals can be differentiated into different fracture mechanisms, which hypothetically can be scaled to a field situation. This would allow the comparison of seismic signals from controlled lab conditions with seismic signals from the field. The proposed experiments will enable the following:

- Assess fracturing limits within a known stress field.
- Assess fracture permeability of fractured rock salt and any subsequent healing which may occur.
- Compare between laboratory acoustic emission under a range of conditions and field-measured seismicity.

The results of this PhD will improve our understanding of the risks associated with short and long-term containment of brine and/or gas in salt caverns, during and after the caverns lifetime. You will mainly work in the lab at TU Delft, performing mechanical and flow-through experiments, studying the microstructures and analysing data. Tests will be equipped with an acoustic monitoring system, to listen to the laboratory micro-earthquakes occur during fracture and/or fluid propagation, and you will analyse their seismic signature. Moreover, you will have access to micro-seismic monitoring data from a cavern in Denmark, where a field test on abandonment is planned. You will interpret your data in terms of microphysical processes, and implement and combine with salt cavern assessments to determine whether fracturing is expected to occur. You will have the opportunity to present nationally and internationally to other researchers, industry partners and stakeholders at scientific and industrial meetings. This will culminate in writing open access scientific publications.

Moreover, this project is embedded within a research project funded by the Solution Mining Research Institute (SMRI), led by Nobian. You will be asked to contribute on reporting of the research effort, including attendance at the SMRI conferences. You will have the opportunity to learn about salt solution mining in the field, and its role in facilitating storage caverns for the energy transition.

**Job requirements**:
You are curious and love expanding your horizon. You have a hands-on attitude with respect to laboratory work, demonstrated by (for example) a love of repairing or building things, enjoyment of practical exercises during studies, etc. Any previous experience with rock deformation work will be a plus. In your contacts with your colleagues and your project partners you put your communication skills to good use. You enjoy mentoring and interacting with students, while growing your own skills and expertise.

You also have:

- Good experimental skills. Learning on the job will definitely occur, but a practical mindset to problem-solving is prerequisite.
- Knowledge of Excel, Python and/or Matlab for data analysis.
- Excellent analytical skills.
- A keen interest in interdisciplinary research.
- An excellent command of English, as you’ll be working in an internationally diverse community and with international partners. Knowledge of the Danish language is considered a plus.

**TU Delft (Delft University of Technology)**:
Delft University of Technology is built on strong foundations. As creators of the world-famous Dutch waterworks and pioneers in biotech, TU Delft is a top international university combining science, engineering and design. It delivers world class results in education, research and innovation to address challenges in the areas of energy, climate, mobility, health and digital society. For generations, our engineers have proven to be entrepreneurial problem-solvers, both in business and in a social context.

Challenge. Change. Impact

**Faculty of Civil Engineering and Geosc

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