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Investigation on Numerical Modeling Aspects of Hydraulic Fracturing

C. Vinci, J. Renner, and H. Steeb
Ruhr-Universität Bochum
Bochum, Germany

During hydraulic fracturing processes, several coupled mechanical and hydraulical phenomena take place. We investigate an elastically deformable fluid-filled fracture embedded in a porous rock matrix. Despite the substantial number of previous modeling approaches, a clear insight into the numerical solution procedure of high pressure fluid injection in a fracture has not been gained. We use ...

Eccentricity of Normal Electric Borehole Sondes with Finite Geometry

A. Galsa, and M. Herein
Eötvös University
Budapest, Hungary

Numerical calculations have been carried out to quantify the effect of the eccentric position of normal electric borehole sondes on the current density distribution and the obtained specific resistivity. In the most calculations the distorting influence of the eccentricity (distance between the axis of the borehole and the sonde) on the specific resistivity is less than 2%, but in special cases ...

Analog and FEM Models of Lava Dome Dynamics

P. Vincent[1], and P. Zevada[2]
[1]College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Oregon
[2]Dept. of Tectonics and Geodynamics, Institute of Geophysics ASCR, v.v.i., Prague, Czech Republic

Extrusion of highly viscous lavas that spread laterally and form lava domes in craters of large volcanoes is associated with significant volcanic hazards. Gas overpressure driven fragmentation of the lava dome or collapse and slumping of marginal sections or entire mass of the dome can trigger dangerous pyroclastic flows that threaten surrounding populations up to tens of kilometers away. We ...

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