01876nab a2200205 4500 20260608201701.0 260224s2010 xxu Benaïssa, Z. 45615 Benaïssa, A. 45616 Zaouia, F.S. 45617 Using sonic log data to investigate a multiple problem in the Hassi R'mel field, Algeria abr. 2010 13/07/2010 ; 13/07/2010 5 p. ; 121-125 Transcripción del resumen del autor. In order to reveal the structural properties at small scale within a geological unit apparently homogeneous at large scale, we explore the stochastic components of petrophysical measurements recorded in a borehole drilled through the Cretaceous siliclastic units of the South-eastern Basin of France. First, we analyse the instantaneous fluctuations of gamma ray log measurements searching for scaling laws in its power spectrum. Power spectra indicate a scaling behaviour with average exponent ßa values mostly falling in the range 1 < ßa < 3, a typical fingerprint of fractional Brownian motion. We show that the changes in scaling exponents extracted from the natural gamma ray measurement by a Continuous Wavelet Transform present a close correlation with the stochastic behaviour of radioactive decay processes described by the Poisson's law. Secondly, we investigate the stochastic component of three different electrical resistivity logs. In the space/frequency domain explored by a Continuous Wavelet Transform, their local spectral densities show self-affine proprieties. An integrated statistical analysis of the local variations of the three pseudo-logs extracted from these measurements allows to point out new petrophysical heterogeneity within the silty unit. 3-4 ARTICULO 174945 174945 0 0 0 0 242764 BAAB BAAB 2026-03-05 200046825 0 200046825 2026-03-05 18:52:28 2026-03-05 ARTICULO