Later on several field and laboratory porosity, permeability, bulk density and electrical measurements have been carried out to make the conductivity. We have cited the advantage of the seismoelectric theory well established and to prove it seismolelectric method over conventional seismic in saline as a key tool for future geotechnical explorations. Future development of this method with a wide range of applications has been the main focus of this review aricle. Among these the Electrokinetic medium. This energy transfer is logically dependant mechanism is the prime reason for the generation of on the mechanical parameters that affect the fluid electric charges in rock.
Porous materials in contact flow in pores and the amount of ions present. This leads to development of information can be extracted about hydraulic zeta potential at the grain fluid interface Figure1. Moreover a highly thin impermeable layer of the order of 1 cm that has a great role in groundwater flow is difficult to image by conventional geophysical approach.
However information regarding these sorts of target are important in deeper studies conducted for hydrocarbon exploration. The adsorbed and diffuse layers of the EDL are shown. The charge b separation of the mobile ions in the diffuse layer gives rise to the development of Zeta potential.
On the other hand Piezoelectricity describes the phenomenon that when stress field is applied to Figure2: a Generation of co-seismic field, b certain crystal in specific crystallographic directions, Interface response as virtual dipoles. Triboelectricity occurs when crystals are c Direct field: Due to directed seismic source e. Advancing fractured to electrokinetic mechanism. This charge separation wedges cause charge separation on either of the produces strong vertical component of electric dipole, opposite sides.
The contact electrification occurs due the associated field of which is referred to as the to charge between two dissimilar bodies upon direct field. Types of Electric Fields The several types of electric fields associated with the seismoelectric phenomena are : a Coseismic field: Due to development of EDL at the grain fluid boundary, the pore fluid movement transports small amount of charge relative to the fixed charge on the adjacent grain.
An effective interface response, co-seismic field and direct field inversion technique for the exact frequency of the. The lower frequency coseismic field can be removed by using a A standard engineering seismograph and a standard low cut filter, since our main objective of interest is geophone cable is used. But instead of connecting the interface response.
Using a Poroelastic Theory to Reconstruct Subsurface Properties: Numerical Investigation
Again we can use high cut geophone to each takeout on the geophone cable, filter to remove the effect of background noise. Each The main processing scheme of the seismolectric channel of the seismograph is connected to a pair of data can now be shown below as: electrodes pounded into the ground. The seismograph records electric potential across each of the pairs of Pre processing. Power electrodes.
Thus a 24 channel seismograph connects line noise removal and to a 24 channel electrode. We can use Sledgehammer, separation by linear chemical explosive or electromagnetic vibrator radon transform, f-k EMvibe as seismic source. Seismoelectric data processing In the pre processing scheme, Sinusoidal subtraction technique described by Butler and Russel , or a two zero, two pole autoregressive moving-average notch filter Dietrich et al. Source- Jardani, 10 filter. Source- Haines, In this figure the geophones and electrodes ele are located at the top surface of the system.
Levels ls L1 and L2 correspond Research works on the just ustification of to two layers and R indicates thee reservoir. The directt field fi and the reflected tool: seismic arrivals are recorded as the co-seismic co field and the The co-seismic field and the interfterface response seismic source is located at a dep epth of 20m from the effects were predicted by the fu full waveform surface. The ace response is fact that the seismoelectric interface True value of the material properti rties used for synthetic Fresnel zone of produced primarily within the first Fr model shown in Figure 6: sion was found seismic to electromagnetic conversio from the full waveform simulationss bby Garambois and Dietrich Revil and Ja Jardani presented a finite element code with ith which they response due to modeled the co-seismic and interface re eservoir and an boundaries between an oil-filled rese embedding medium.
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A synthetic case study supporting ing the inverse modeling of seismoelectric signals: presented a Jardani, Revil, Slob and Sollner seismic and the stochastic joint inversion of the seis ptive metropolis seismoelectric data based on the adapti algorithm in order to obtain a proba bability density function of the material properties of each geologic source :Jardani, unit. This includes the permeabili bility, porosity, electrical conductivity, bulk modulusus of the fluid, bulk modulus of the solid phase aand the shear modulus of the formations. A test to this approach Results and discussions of the joint join inversion based on was also performed by them by cconsidering a the model: synthetic model comprising of two horhorizontal layers and a reservoir partially saturated with ith oil, which is They used the AMA Auto-regressi ssive Moving Average embedded in the second layer.
The seismoelectric sections showing thee three t units L1, L2 and the reservoir R are shown in Figure ure 7. In figure 7. A better porosity estimation can be done by interface response fields in terms of travel time, using the relations between the permeability, bulk density polarity, waveform and spatial amplitude decay. For this explanation the seismoelectric method must be expanded to multiple wave effects that requires future research works.
They have also thrown light for making an appropriate seismolectri model for explaining thin layer geometry.
Haines et al. This study finally gave the interface response at that depth.
Researcher: Gareth Shane O'Brien in Publications - Dimensions
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Hide details. Abstract : The quantitative imaging of the Earth subsurface is a major challenge in geophysics. In oil and gas exploration and production, aquifer management and other applications such as the underground storage of CO2 , seismic imaging techniques are implemented to provide as much information as possible on fluid-filled reservoir rocks. Biot theory Biot, and its extensions provide a convenient framework to connect the various parameters characterizing a porous medium to the wave properties, namely, their amplitudes, velocities and frequency contents. The poroelastic model involves more parameters than the elastodynamic theory, but on the other hand, the wave attenuation and dispersion characteristics at the macroscopic scale are determined by the intrinsic properties of the medium without having to resort to empirical relationships.