Tube‐wave monitoring of oil fields

Korneev, Valeri; Bakulin, Andrey; Ziatdinov, S. R.

doi:10.1190/1.2370279

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…We may also interpret decrease of A s /A p in a porous media with higher mobility as redistribution of elastic energy from shear to fast compressional wave. Finally, different radiation in elastic and poroelastic media can shed some light on why tubewave conversion to body and guided waves is larger on permeable as opposed to impermeable layers (Korneev et al, 2006).…”

Section: Radiation Patternmentioning

confidence: 99%

“…In this study we focus on a task of cylindrical borehole surrounded by homogeneous poroelastic Biot media. This task is important for cross-well tube-wave monitoring which relies on increased conversion of tube waves into body and guided waves on poroelastic layers compared to elastic impermeable beds (Korneev et al, 2006). Such conversion can be thought as a secondary point source in the borehole and we aim to understand how presence of permeable porous formation modifies the radiation.…”

Section: Introductionmentioning

confidence: 99%

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Far-Field Radiation in Poroelastic Media from a Point Source in a Fluid-Filled Borehole

Ziatdinov¹,

Bakulin²,

Kashtan³

et al. 2007

69th EAGE Conference and Exhibition Incorporating SPE EUROPEC 2007

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Cross-well seismic with direct, reflected and tube waves is often used for imaging and monitoring of oil and gas reservoirs. Even though downhole sources are usually located in the borehole fluid, at low frequencies their radiation is modified by the presence of poroelastic formations surrounding the well. Permeable formations also enhance the conversion of borehole tube waves into body or other formation waves, which is an important foundation for a tube-wave monitoring. To capture the influence of porous and permeable formation on radiation of formation waves, we derive analytic expressions for a far-field radiation of compressional and shear waves from a point pressure source located inside a fluid-filled borehole. We demonstrate how various attributes of this radiation are controlled by permeability and viscosity of the pore fluid and other parameters at low seismic frequencies. We show that radiation patterns in formations with good permeability can be distinguished from the radiation patterns in an equivalent elastic impermeable media. To verify obtained results we compare analytical far-field radiation with a finite-difference computations and observe good agreement between the two approaches.

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Section: Radiation Patternmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Far-Field Radiation in Poroelastic Media from a Point Source in a Fluid-Filled Borehole

Ziatdinov¹,

Bakulin²,

Kashtan³

et al. 2007

69th EAGE Conference and Exhibition Incorporating SPE EUROPEC 2007

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show abstract

“…; Henry ), as well as in subsurface‐feature resonance calculations (Chouet ; Ferrazini and Aki ). In addition, measuring a trapped‐mode phase speed and attenuation via subsurface seismic stations proximate to a fault may be an input for the validation of fault properties, including its aperture and the surrounding medium permeability (Nagano and Niitsuma ; Korneev, Parra, and Bakulin ; Korneev, Bakulin, and Ziatdinov ). In reality, no subsurface feature is a perfect slot of a constant aperture; one can reasonably assume, however, that our formulae are applicable asymptotically as long as wavelength is much larger than the asperity and inflection lengthscale.…”

Section: Introductionmentioning

confidence: 99%

“…Knowing that the highly dispersive trapped wave properties may turn out to be important in various studies involving seismic propagation in the presence of subsurface fractures and faults, e.g., fracture width monitoring via borehole tube wave reflections Kostek et al 1989) or fracture length assessment from tip reflections (Paige et al 1992;Henry 2005), as well as in subsurface-feature resonance calculations (Chouet 1981;Ferrazini and Aki 1987). In addition, measuring a trapped-mode phase speed and attenuation via subsurface seismic stations proximate to a fault may be an input for the validation of fault properties, including its aperture and the surrounding medium permeability (Nagano and Niitsuma 1996;Korneev, Parra, and Bakulin 2005;Korneev, Bakulin, and Ziatdinov 2006). In reality, no subsurface feature is a perfect slot of a constant aperture; one can reasonably assume, however, that our formulae are applicable asymptotically as long as wavelength is much larger than the asperity and inflection lengthscale.…”

Section: Introductionmentioning

confidence: 99%

Properties of low‐frequency trapped mode in viscous‐fluid waveguides

Никитин

Plyushchenkov

Segal

2016

Geophysical Prospecting

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A B S T R A C TWe derived the velocity and attenuation of a generalized Stoneley wave being a symmetric trapped mode of a layer filled with a Newtonian fluid and embedded into either a poroelastic or a purely elastic rock. The dispersion relation corresponding to a linearized Navier-Stokes equation in a fracture coupling to either Biot or elasticity equations in the rock via proper boundary conditions was rigorously derived. A cubic equation for wavenumber was found that provides a rather precise analytical approximation of the full dispersion relation, in the frequency range of 10 −3 Hz to 10 3 Hz and for layer width of less than 10 cm and fluid viscosity below 0.1 Pa·s [100 cP]. We compared our results to earlier results addressing viscous fluid in either porous rocks with a rigid matrix or in a purely elastic rock, and our formulae are found to better match the numerical solution, especially regarding attenuation. The computed attenuation was used to demonstrate detectability of fracture tip reflections at wellbore, for a range of fracture lengths and apertures, pulse frequencies, and fluid viscosity.

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Tube‐wave monitoring at Mallik field: comparing modeled and experimental time‐lapse responses

Ziatdinov

Bakulin

Kashtan

et al. 2006

SEG Technical Program Expanded Abstracts 2006

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We apply tube-wave monitoring method to a time-lapse cross-well dataset from Mallik field. Raw waveforms are used for analysis thus avoiding any smearing of 4D response introduced by pre-processing. We perform extensive modeling that includes effects of a source borehole and confirms nature of most prominent arrivals as being tube-wave related. Modeling proves that strongest conversion of tube wave into P and S waves occurs at the sharp acoustic boundary. Data displays clear time-lapse changes in tube-wave related arrivals, while shows no change in first arrivals. Modeling suggests that to explain the data the reservoir changes have to occur at a deeper interval than previously anticipated, below the perforations. Excellent agreement between modeled and experimental data provides us with good confidence in our results. This study represents first application of tube-wave monitoring concept.

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Tube‐wave monitoring of oil fields

Cited by 7 publications

References 6 publications

Far-Field Radiation in Poroelastic Media from a Point Source in a Fluid-Filled Borehole

Far-Field Radiation in Poroelastic Media from a Point Source in a Fluid-Filled Borehole

Properties of low‐frequency trapped mode in viscous‐fluid waveguides

Tube‐wave monitoring at Mallik field: comparing modeled and experimental time‐lapse responses

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