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SATI algorithm - the calculation of stress aligned HTI stiffness tensor for sandstone reservoir from wireline data

Science China(Physics,Mechanics & Astronomy) 2011年第11期54卷 1937-1942页

作者： brajanovski miroslav State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of Science

I present an algorithm that uses cross-dipole wireline data only in order to estimate the HTI stiffness tensor for sandstone formations under in-situ asymmetric lateral (azimuthal) stress *** algorithm is based on the generalization of terms "excess compliance" and "fracture weakness" developed within the linear slip interface theory for fractured rocks and is applied here to describe the effect of grain contacts in loose sandstones.I introduce the term "plane of weakness" being oriented (aligned) orthogonal to theminimal horizontal principal stress direction in order to describe the overall effective weakness of sandstone caused by the different principal *** the quantification of this phenomenon I use the anisotropic Gassmann *** a result I am able to calculate a HTI stiffness tensor for the interval length of a saturated sandstone formation and the respective Thomsen's *** input data required for these calculations have to be provided by wireline logging and will consist of porosity,density,P-wave velocity,fast and slow shear wave velocities and oil-water saturation *** algorithm in its current form is applicable to sandstone reservoirs *** limitation is based on two assumptions,which state that all the measured anisotropy is induced by the present stress in sandstone and that the unstressed sandstone would be nearly *** a technical viewpoint this algorithm can be implemented fairly easily in data acquisition and interpretation software relying on correct estimation of anisotropy *** is also cheap because it does not require any additional measurements apart from the cross-dipole logging.

关键词： rock physics poroelasticity fractures stress anisotropy S-waves

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A model for strong attenuation and dispersion of seismic P-waves in a partially saturated fractured reservoir

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Science China(Physics,Mechanics & Astronomy) 2010年第8期53卷 1383-1387页

作者： brajanovski miroslav MüLLER Tobias M PARRA Jorge O Department of Exploration Geophysics Curtin University of Technology Geophysical Institute University of Karlsruhe Southwest Research Institute

In this work we interpret the data showing unusually strong velocity dispersion of P-waves (up to 30%) and attenuation in a relatively narrow frequency range. The cross-hole and VSP data were measured in a reservoir, which is in the porous zone of the Silurian Kankakee Limestone Formation formed by vertical fractures within a porous matrix saturated by oil, and gas patches. Such a medium exhibits significant attenuation due to wave-induced fluid flow across the interfaces between different types of inclusions (fractures, fluid patches) and background. Other models of intrinsic attenuation (in particular squirt flow models) cannot explain the amount of observed dispersion when using realistic rock properties. In order to interpret data in a satisfactory way we develop a superposition model for fractured porous rocks accounting also for the patchy saturation effect.

关键词： attenuation dispersion Biot’s slow wave poroelasticity fractures patchy-saturation

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