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Local Regularity Analysis of Strata Heterogeneities from Sonic Logs : Volume 17, Issue 5 (20/09/2010)

By Gaci, S.

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Book Id: WPLBN0003984376
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: Local Regularity Analysis of Strata Heterogeneities from Sonic Logs : Volume 17, Issue 5 (20/09/2010)  
Author: Gaci, S.
Volume: Vol. 17, Issue 5
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Holschneider, M., Hamoudi, M., Zaourar, N., & Gaci, S. (2010). Local Regularity Analysis of Strata Heterogeneities from Sonic Logs : Volume 17, Issue 5 (20/09/2010). Retrieved from http://worldebookfair.org/


Description
Description: Département Géophysique – FSTGAT, Université des Sciences et de la Technologie Houari Boumediene (USTHB), BP 32 El Alia, 16111, Algiers, Algeria. Borehole logs provide geological information about the rocks crossed by the wells. Several properties of rocks can be interpreted in terms of lithology, type and quantity of the fluid filling the pores and fractures.

Here, the logs are assumed to be nonhomogeneous Brownian motions (nhBms) which are generalized fractional Brownian motions (fBms) indexed by depth-dependent Hurst parameters H(z). Three techniques, the local wavelet approach (LWA), the average-local wavelet approach (ALWA), and Peltier Algorithm (PA), are suggested to estimate the Hurst functions (or the regularity profiles) from the logs.

First, two synthetic sonic logs with different parameters, shaped by the successive random additions (SRA) algorithm, are used to demonstrate the potential of the proposed methods. The obtained Hurst functions are close to the theoretical Hurst functions. Besides, the transitions between the modeled layers are marked by Hurst values discontinuities. It is also shown that PA leads to the best Hurst value estimations.

Second, we investigate the multifractional property of sonic logs data recorded at two scientific deep boreholes: the pilot hole VB and the ultra deep main hole HB, drilled for the German Continental Deep Drilling Program (KTB). All the regularity profiles independently obtained for the logs provide a clear correlation with lithology, and from each regularity profile, we derive a similar segmentation in terms of lithological units. The lithological discontinuities (strata' bounds and faults contacts) are located at the local extrema of the Hurst functions. Moreover, the regularity profiles are compared with the KTB estimated porosity logs, showing a significant relation between the local extrema of the Hurst functions and the fluid-filled fractures. The Hurst function may then constitute a tool to characterize underground heterogeneities.


Summary
Local regularity analysis of strata heterogeneities from sonic logs

Excerpt
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