000			01876nab a2200205 4500
005			20260608201701.0
008			260224s2010 xxu
100	1		_aBenaïssa, Z. _945615
100	1		_aBenaïssa, A. _945616
100	1		_aZaouia, F.S. _945617
245	0	0	_aUsing sonic log data to investigate a multiple problem in the Hassi R'mel field, Algeria
260			_a _b _cabr. 2010
270			_a13/07/2010 ; 13/07/2010
300			_a5 p. ; 121-125
520			_aTranscripción 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.
581			_a3-4
773			_g
942			_cARTICULO
999			_c174945 _d174945