수치모델링에 의한 시추공 인공완전파형 합성연구
|수치모델링에 의한 시추공 인공완전파형 합성연구
|Synthetic microseismograms of axisymmetric logging tool for isotropic solid are computed and illustrated. All quantities are expressed in terms of appropriate scalar and vector potentials. The displacements and stresses with the amplitude coefficients determined by boundary conditions are expresse in terms of these potentials. The waveforms are calculated by numerical evaluation of Fourier transforms. The numerical integrations in wavenumber domain are straight-forward by inserting the lossy parameters into the stress-strain relations. The computed microseismograms propagating along the fluid-filled borehole are analysed for the relations between traveltime and amplitude of waves and a) axial or source-to-receiver, b) radial distance and c) Poisson's ratio. The depth of penetration of P wave may be more than a wavelength, and the depth of penetration of shear wave may be approximaterly a wavelength. The amplitudes of tube wave decrease with the Poisson's ratio increasing, the amplitudes of P wave increase with the Poission's ratio increasing, and the amplitudes of shear wave are almost constant for the Poisson's ratio.
|수치모델링, 시추공인공완전파형합성, 시추공, 파동방정식, 파형
황세호. (1999). 수치모델링에 의한 시추공 인공완전파형 합성연구. 과학기술부.