MALLIK 2002, Crosswell seismic experiments
In the early winter/spring of 2002, a scientific drilling program was carried out in the Mackenzie Delta, NW territories, Canada. One main research well and two additional observation wells were drilled to depths of about 1200 m. The main objective is to investigate permafrost gas hydrates in one of the most prominent occurences of its kind. More than 100 scientists worldwide participate in this project (see Mallik ICDP website). A wide range of present gas hydrate research is covered.
The crosswell seismic measurements were carried out by making use of two 1160 m deep observation wells (Mallik 3L-38 and 4L-38) both 42.5 m from and co-planar with the 1188 m deep production research well (5L-38). A high power piezo-ceramic source was used to generate sweeped signals with frequencies between 100 and 2000 Hz recorded with arrays of 8 hydrophones per depth level. A depth range between 800 and 1150 m was covered, with shot and receiver spacings of 0.75 m. High quality data could be collected during the survey which allow for application of a wide range of crosswell seismic methods.
Participants in GFZ Section 2.2 / Uni Potsdam
- K. Bauer (contact person)
- Ch. Haberland
- T. Ryberg
- M. Stiller
- M. Weber
- Dr. J. Kulenkampff, Dr. E. Spangenberg (GFZ Section 5.2)
- J. Henninges, Dr. E. Huenges (GFZ Section 5.2)
- Prof. Dr. R.G. Pratt (Queen's University, Kingston, Canada)
- Dr. S. Shimizu (JNOC, Japan)
- Prof. Dr. B. Milkereit (University of Toronto, Canada)
- Prof. Dr. D. Schmitt (University of Alberta, Edmonton, Canada)
- BMBF (Geotechnologien)
Experiment time frame
- February - March 2002
- P wave velocity, anisotropy and attenuation tomography
- application of pattern recognition techniques
- integration of downhole geophysical and core data
- seismic monitoring of gas hydrate dissociation processes
- modeling of surface seismic response based on crosswell results
- re-processing of 3-D surface seismic data
- Bauer, K., C. Haberland, R.G. Pratt, F. Hou, B.E. Medioli, and M.H. Weber (2005): Ray-based cross-well tomography for P-wave velocity, anisotropy, and attenuation structure around the JAPEX/JNOC/GSC et al. Mallik 5L-38 gas hydrate production research well. - in Scientific Results from Mallik 2002 Gas Hydrate Production Research Well Program, Mackenzie Delta, Northwest Territories, Canada. (ed.) S.R. Dallimore and T.S. Collett, Geol. Surv. Canada, Bull. 585, 21 pp.
- Bauer, K., R.G. Pratt, M.H. Weber, T. Ryberg, C. Haberland, and S. Shimizu (2005): Mallik 2002 cross-well seismic experiment: project design, data acquisition, and modelling studies. - in Scientific Results from Mallik 2002 Gas Hydrate Production Research Well Program, Mackenzie Delta, Northwest Territories, Canada. (ed.) S.R. Dallimore and T.S. Collett, Geol. Surv. Canada, Bull. 585, 14 pp.
- Pratt, R.G., Hou, F., Bauer, K., and Weber, M.H. (2005): Waveform tomography images of velocity and inelastic attenuation from the Mallik 2002 cross-hole seismic surveys. - in Scientific Results from Mallik 2002 Gas Hydrate Production Research Well Program, Mackenzie Delta, Northwest Territories, Canada. (ed.) S.R. Dallimore and T.S. Collett, Geol. Surv. Canada, Bull. 585, 14 pp.
- Dallimore, S.R., Collett, T.S., Weber, M. H. and T. Uchida, T. (2002): Drilling program investigates permafrost gas hydrates, EOS, v. 83, p. 193/198, 2002.