Joint inversion of geophysical data for site characterization and restoration monitoring. FY97 annual progress report for EMSP

'The purpose of this project is to develop a computer code for joint inversion of seismic and electrical data, to improve underground imaging for site characterization and remediation monitoring. The computer code developed in this project will invert geophysical data to obtain direct estimates of porosity and saturation underground, rather than inverting for seismic velocity and electrical resistivity or other geophysical properties. This is intended to be a significant improvement in the state-of-the-art of underground imaging, since interpretation of data collected at a contaminated site would become much less subjective. Potential users include DOE scientists and engineers responsible for characterizing contaminated sites and monitoring remediation of contaminated sites. In this three-year project, the authors use a multi-phase approach consisting of theoretical and numerical code development, laboratory investigations, testing on available laboratory and borehole geophysics data sets, and a controlled field experiment, to develop practical tools for joint electrical and seismic data interpretation. This report summarizes work after about 1.7 years of a 3-year project. Progress on laboratory measurements is described first, followed by progress on developing algorithms for the inversion code to relate geophysical data to porosity and saturation.'

[1]  A. R. Gregory,et al.  An experimental investigation of factors affecting elastic wave velocities in porous media , 1958 .

[2]  W. P. Taylor,et al.  Tectonically influenced glacial erosion, and ensuing valley infill: a geophysical survey , 1997, Quarterly Journal of Engineering Geology.

[3]  Mukul M. Sharma,et al.  The influence of clay content, salinity, stress, and wettability on the dielectric properties of brine-saturated rocks; 10 Hz to 10 MHz , 1994 .

[4]  James G. Berryman,et al.  Influence of microstructure on rock elastic properties , 1993 .

[5]  Schwartz,et al.  New pore-size parameter characterizing transport in porous media. , 1986, Physical review letters.

[6]  James G. Berryman,et al.  Long‐wavelength propagation in composite elastic media I. Spherical inclusions , 1980 .

[7]  W. Murphy.  Acoustic measures of partial gas saturation in tight sandstones , 1984 .

[8]  J. Berryman,et al.  Volume averaging, effective stress rules, and inversion for microstructural response of multicomponent porous media , 1998 .

[9]  S. N. Domenico,et al.  Effect of brine-gas mixture on velocity in an unconsolidated sand reservoir. [Laboratory velocity measurements in unconsolidated sand at various brine saturations] , 1976 .

[10]  Leonard Domaschuk,et al.  A STUDY OF BULK AND SHEAR MODULI OF A SAND , 1969 .

[11]  David I. McLean,et al.  Seismic Evaluation of Pile-Founded Highway Bridge on Saturated Peat , 1998 .

[12]  R. Wilkens,et al.  VELOCITY-POROSITY RELATIONSHIPS IN THE UPPER OCEANIC CRUST : THEORETICAL CONSIDERATIONS , 1992 .

[13]  G. E. Archie.  The electrical resistivity log as an aid in determining some reservoir characteristics , 1942 .

[14]  Robin Newmark,et al.  Electrical Resistance Tomography for Steam Injection Monitoring and Process Control , 1995 .

[15]  E. Hamilton,et al.  Sound velocity and related properties of marine sediments , 1982 .

[16]  Douglas LaBrecque,et al.  Monitoring an underground steam injection process using electrical resistance tomography , 1993 .

[17]  M. H. Waxman,et al.  Electrical Conductivities in Oil-Bearing Shaly Sands , 1968 .

[18]  H. F. Morrison,et al.  Crosswell electromagnetic tomography: System design considerations and field results , 1995 .

[19]  James G. Berryman,et al.  Connecting theory to experiment in poroelasticity , 1998 .

[20]  A. Nur,et al.  Effects of porosity and clay content on wave velocities in sandstones , 1986 .

[21]  James G. Berryman,et al.  Ultrasonic velocity‐porosity relationships for sandstone analogs made from fused glass beads , 1995 .

[22]  James G. Berryman,et al.  Bulk elastic wave propagation in partially saturated porous solids , 1988 .

[23]  M. Nafi Toksöz,et al.  Velocity and attenuation of seismic waves in two-phase media; Part I, Theoretical formulations , 1974 .

[24]  J. Berryman,et al.  Critique of two explicit schemes for estimating elastic properties of multiphase composites , 1996 .

[25]  J. H. Justice,et al.  Time-lapse crosswell seismic tomogram interpretation: Implications for heavy oil reservoir characterization, thermal recovery process monitoring, and tomographic imaging technology , 1995 .

[26]  G. R. Olhoeft,et al.  Low-frequency electrical properties. , 1985 .

[27]  Harris,et al.  High Resolution Crosswell Imaging of a West Texas Carbonate Reservoir , 1993 .

[28]  A. R. Gregory,et al.  ELASTIC WAVE VELOCITIES IN HETEROGENEOUS AND POROUS MEDIA , 1956 .

[29]  Brian P. Bonner,et al.  Ultrasonic Attenuation Measurement by Spectral Ratios Utilizing Signal Processing Techniques , 1981, IEEE Transactions on Geoscience and Remote Sensing.

[30]  Chuen Hon Arthur Cheng.  Seismic velocities in porous rocks : direct and inverse problems/ , 1978 .

[31]  S. Mallick,et al.  In Situ measurement of transverse isotropy in shallow‐water marine sediments , 1991 .

[32]  R V Whitman.  MISCELLANEOUS STUDIES OF THE FORMATION OF WAVE FRONTS IN SAND , 1966 .

[33]  Ki Ha Lee,et al.  Crosshole electromagnetic tomography: A new technology for oil field characterization , 1995 .

[34]  P. A. Berge,et al.  Joint inversion of geophysical data for site characterization and restoration monitoring , 1998 .