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Simulation of wave propagation in bo...

Chi, Shihong.

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Simulation of wave propagation in boreholes and radial profiling of formation elastic parameters.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Simulation of wave propagation in boreholes and radial profiling of formation elastic parameters./
Author:	Chi, Shihong.
Description:	281 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 5981.
Contained By:	Dissertation Abstracts International64-12B.
Subject:	Geophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3117887

Simulation of wave propagation in boreholes and radial profiling of formation elastic parameters.
Chi, Shihong.

Simulation of wave propagation in boreholes and radial profiling of formation elastic parameters. - 281 p.

Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 5981.

Thesis (Ph.D.)--The University of Texas at Austin, 2003.

Modern acoustic logging tools measure in-situ elastic wave velocities of rock formations. These velocities provide ground truth for time-depth conversions in seismic exploration. They are also widely used to quantify the mechanical strength of formations for applications such as wellbore stability analysis and sand production prevention. Despite continued improvements in acoustic logging technology and interpretation methods that take advantage of full waveform data, acoustic logs processed with current industry standard methods often remain influenced by formation damage and mud-filtrate invasion.Subjects--Topical Terms:

535228
Geophysics.

Simulation of wave propagation in boreholes and radial profiling of formation elastic parameters.
LDR:03707nmm 2200313 4500 001 1866178
005 20041220114131.5
008 130614s2003 eng d
035 $a (UnM)AAI3117887
035 $a AAI3117887
040 $a UnM $c UnM
100 1 $a Chi, Shihong. $3 1953588
245 1 0 $a Simulation of wave propagation in boreholes and radial profiling of formation elastic parameters.
300 $a 281 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 5981.
500 $a Supervisors: Kenneth E. Gray; Carlos Torres-Verdin.
502 $a Thesis (Ph.D.)--The University of Texas at Austin, 2003.
520 $a Modern acoustic logging tools measure in-situ elastic wave velocities of rock formations. These velocities provide ground truth for time-depth conversions in seismic exploration. They are also widely used to quantify the mechanical strength of formations for applications such as wellbore stability analysis and sand production prevention. Despite continued improvements in acoustic logging technology and interpretation methods that take advantage of full waveform data, acoustic logs processed with current industry standard methods often remain influenced by formation damage and mud-filtrate invasion.
520 $a This dissertation develops an efficient and accurate algorithm for the numerical simulation of wave propagation in fluid-filled boreholes in the presence of complex, near-wellbore damaged zones. The algorithm is based on the generalized reflection and transmission matrices method. Assessment of mud-filtrate invasion effects on borehole acoustic measurements is performed through simulation of time-lapse logging in the presence of complex radial invasion zones. The validity of log corrections performed with the Biot-Gassmann fluid substitution model is assessed by comparing the velocities estimated from array waveform data simulated for homogeneous and radially heterogeneous formations that sustain mud-filtrate invasion.
520 $a The proposed inversion algorithm uses array waveform data to estimate radial profiles of formation elastic parameters. These elastic parameters can be used to construct more realistic near-wellbore petrophysical models for applications in seismic exploration, geo-mechanics, and production. Frequency-domain, normalized amplitude and phase information contained in array waveform data are input to the nonlinear Gauss-Newton inversion algorithm. Validation of both numerical simulation and inversion is performed against previously published results based on the Thomson-Haskell method and travel time tomography, respectively. This exercise indicates that the numerical method is stable and efficient for the simulation of wave propagation in boreholes surrounded by complex invasion zones. Additional tests of the inversion algorithm are performed on array waveform data acquired in a low-porosity gas field.
520 $a Mud-filtrate invasion effects are not measurable on the estimated P- and S-wave velocities for depths of invasion around 2--3 borehole diameters. Acoustic log corrections performed with the Blot-Gassmann fluid substitution model can only be used for the case of deep invasion. The inversion examples indicate that physically consistent radial profiles of formation density and P- and S-wave velocities can be reconstructed from array waveform data.
590 $a School code: 0227.
650 4 $a Geophysics. $3 535228
650 4 $a Engineering, Petroleum. $3 1018448
690 $a 0373
690 $a 0765
710 2 0 $a The University of Texas at Austin. $3 718984
773 0 $t Dissertation Abstracts International $g 64-12B.
790 1 0 $a Gray, Kenneth E., $e advisor
790 1 0 $a Torres-Verdin, Carlos, $e advisor
790 $a 0227
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3117887