CREWES 2003 Sponsors Meeting We’ve presented our research results and educational progress in geophysical exploration in partnership with the resource industry. We’ve enjoyed visiting with you! Thank you for your interest, comments, and support.
Continuing CREWES Focus in SEISMIC LITHOLOGY & FLUID IMAGING INTERPRET. & CASES BOREHOLE & HIGH-RES. NUMERICAL MODELING SIGNAL PROCESSING PHYSICAL MODELING FIELD OPS. & INSTRUMENTS
Future Research: Risk and Reward
where: u is local displacement; 0 is the density; , are amplitudes in nonlinear terms. Non-linear wave equation: Non-welded contacts, etc.
Overtones generated by non-linear propagation (Physics Today, 2001)
Attenuation-relaxation imaging Fluid-saturated rock
Seismoelectric phenomena (Gharibi, Bentley, & Stewart) Elastic waves can induce electromagnetic fields through various coupling mechanisms. P-wave rock matrix S-wave rock matrix
Using a quasi-static approximation, ( )>> ( ), ( : electrical conductivity, : dielectric permittivity, : angular frequency) and plane-wave solution for an isotropic and homogenous whole-space; Linear relationship between EM and elastic waveforms,for P-waves,for SH-waves,for P-waves,for SV-waves E: electric field H: magnetic field U: grain displacement
L( , , , ,…) is a function of fluid’s electric conductivity ( ), fluid’s dielectric constant ( ), shear viscosity ( ), and bulk density ( ). T( , , , ,G,…) is a function of porosity ( ), fluid’s dielectric constant ( ), shear viscosity ( ), bulk density ( ), and shear modulus (G).
Estimation of physical properties Compute L using; or Compute T using; or Invert L and T to estimate; f (L,T ) , , , , , G inversion
Layout of grounded dipole antennas, magnetic sensors, and geophones about the shotpoints in simultaneous recording of seismic and seismoelectromagnetic surveys. Single shot and receiver illustration of simultaneous seismic and seismoelectromagnetic survey. Seismoelectromagnetic survey