Geophysics
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Interpretation of depositional facies from seismic data Depositional environments can be predicted from seismic data through an orderly approach to the interpretation of seismic reflections. One keystone to this approach is an understanding of the effects of lithology and bed spacing on reflection parameters. Amplitude, frequency, and continuity are some of the parameters most useful for interpreting environments. Reflection amplitude contains... ...
Geophysics - Tập 44 Số 2 - Trang 131-160 - 1979
Shallow-structure characterization by 2D elastic full-waveform inversion Assessing the effectiveness of elastic full-waveform-inversion (FWI) algorithms when applied to shallow 2D structures in the presence of a complex topography is critically important. By using FWI, we overcome inherent limitations of conventional seismic methods used for near-surface prospecting (acoustic tomography and multichannel spectral analysis of surface waves). The elastic forward ... ...
Geophysics - Tập 76 Số 3 - Trang R81-R93 - 2011
Permeability prediction based on fractal pore‐space geometryEstimating permeability from grain‐size distributions or from well logs is attractive but difficult. In this paper we present a new, generally applicable, and relatively inexpensive approach which yields permeability information on the scale of core samples and boreholes. The approach is theoretically based on a fractal model for the internal structure of a porous medium. It yields a gener... ...
Geophysics - Tập 64 Số 5 - Trang 1447-1460 - 1999
Inversion of the geophysical inverse problem for n layers with nonuniqueness reduced to n cases A new method is described for reducing nonuniqueness in the geophysical inverse problem for n layers to n cases, provided the ratio of characteristic impedances of sequential layers is of the order of unity and upper and lower layer boundary conditions are known. The method is based on impedance concepts which allow application to a number of different electromagnetic or acoustic experime... ...
Geophysics - Tập 44 Số 4 - Trang 801-819 - 1979
Building tilted transversely isotropic depth models using localized anisotropic tomography with well information Tilted transverse isotropy (TTI) is increasingly recognized as a more geologically plausible description of anisotropy in sedimentary formations than vertical transverse isotropy (VTI). Although model-building approaches for VTI media are well understood, similar approaches for TTI media are in their infancy, even when the symmetry-axis direction is assumed known. We describe a tomographi... ...
Geophysics - Tập 75 Số 4 - Trang D27-D36 - 2010
Viscoelastic finite‐difference modeling Real earth media disperse and attenuate propagating mechanical waves. This anelastic behavior can be described well by a viscoelastic model. We have developed a finite‐difference simulator to model wave propagation in viscoelastic media. The finite‐difference method was chosen in favor of other methods for several reasons. Finite‐difference codes are more portable than, for example, pseud... ...
Geophysics - Tập 59 Số 9 - Trang 1444-1456 - 1994
2D electrical resistivity imaging of some complex landslides in Lucanian Apennine chain, southern Italy We use high-resolution electrical resistivity imaging to delineate the geometry of complex landslides in the Lucanian Apennine chain of southern Italy, to identify the discontinuity between the landslide material and bedrock, and to locate possible surfaces of reactivation. The Lucanian Apennine chain is characterized by high hydrogeological hazard and shows a complete panorama of mass mo... ...
Geophysics - Tập 70 Số 3 - Trang B11-B18 - 2005
A passive seismic survey over a gas field: Analysis of low-frequency anomaliesPassive seismic low-frequency (from approximately [Formula: see text]) data have been acquired at several locations around the world. Spectra calculated from these data, acquired over fields with known hydrocarbon accumulations, show common spectral anomalies. Verification of whether these anomalies are common to only a few, many, or all hydrocarbon reservoirs can be provided only if more ... ...
Geophysics - Tập 74 Số 2 - Trang O29-O40 - 2009
A new approach to fitting induced-polarization spectra Best fitting of induced-polarization (IP) spectra by different models of Cole-Cole type evidences discrepancies in the resulting model parameters. The time constant determined from the same data could vary in magnitude over several decades. This effect, which makes an evaluation of the results of different models nearly impossible, is demonstrated by induced polarization measurements in t... ...
Geophysics - Tập 73 Số 6 - Trang F235-F245 - 2008
On the relationship between iron concentration and induced polarization in marsh soils Induced polarization (IP) measurements [Formula: see text] were conducted on seventeen clay and peat marsh soils that were subsequently analyzed for heavy metal concentrations, moisture content, organic matter, porosity, specific surface area, and pore fluid conductivity. A Cole-Cole model was fit to each sample and model parameters analyzed in terms of physicochemical properties. We foun... ...
Geophysics - Tập 72 Số 1 - Trang A1-A5 - 2007
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