Fibre Optic Sensing as Borehole Seismic Method
| Thesis title in Czech: | Snímání optickými vlákny jako metoda seismického měření ve vrtu |
|---|---|
| Thesis title in English: | Fibre Optic Sensing as Borehole Seismic Method |
| English key words: | Fibre Optic Sensing, Distributed Acoustic Sensing, Borehole measurements, Fiber Bragg grating, Vertical Seismic profiling, LT-1 |
| Academic year of topic announcement: | 2019/2020 |
| Thesis type: | Bachelor's thesis |
| Thesis language: | angličtina |
| Department: | Institute of Hydrogeology, Engineering Geology and Applied Geophysics (31-450) |
| Supervisor: | prof. RNDr. Tomáš Fischer, Ph.D. |
| Author: | hidden - assigned by the advisor |
| Date of registration: | 20.11.2019 |
| Date of assignment: | 20.11.2019 |
| Date of electronic submission: | 15.06.2020 |
| Date of proceeded defence: | 14.07.2020 |
| Opponents: | Ing. Jana Doubravová, Ph.D. |
| Preliminary scope of work |
| The aim of the thesis is to give a review of methods for seismic measurements in boreholes, which experienced a dynamic development in recent years. The student will describe the types of seismometers including classical passive electromagnetic geophones, optical sensors and the newest technologies of distributed acoustic sensing. Different aspects will be compared including the sensitivity, frequency range, measured quantity and others. Suitability of different approaches for specific applications in structural seismology, oil and gas production and other fields will be discussed. The practical part will address a test measurement with chosen method in a borehole and qualitative comparison of used methods. The first option involves comparison of VSP measurements using geophone and DAS in the Litomerice borehole. The second option involves comparison of noise measurements on the surace and in the depth to obtain the response function of the shallow layers. The trird option addresses verification of the velocity model obtained by refraction seismics using the borehole geophone. |
| Preliminary scope of work in English |
| The aim of the thesis is to give a review of methods for seismic measurements in boreholes, which experienced a dynamic development in recent years. The student will describe the types of seismometers including classical passive electromagnetic geophones, optical sensors and the newest technologies of distributed acoustic sensing. Different aspects will be compared including the sensitivity, frequency range, measured quantity and others. Suitability of different approaches for specific applications in structural seismology, oil and gas production and other fields will be discussed. The practical part will address a test measurement with chosen method in a borehole and qualitative comparison of used methods. The first option involves comparison of VSP measurements using geophone and DAS in the Litomerice borehole. The second option involves comparison of noise measurements on the surace and in the depth to obtain the response function of the shallow layers. The trird option addresses verification of the velocity model obtained by refraction seismics using the borehole geophone. |