Отправлено: 13.06.13 10:51. Заголовок: Reservoir parameter classification of a Miocene formation using a fractal approach to well logging

Geophysical Prospecting doi: 10.1111/j.1365-2478.2012.01102.x
Reservoir parameter classification of a Miocene formation using a fractal approach to well logging, porosimetry and nuclear magnetic
resonance
Jadwiga A. Jarzyna , Maria J. Bala, Zofia M. Mortimer, Edyta Puskarczyk
AGH University of Science and T echnology, Krakow, P oland, Faculty of G eology Geophysics and E nvironmental P rotection, Department of
Geophysics
Received August 2011, revision accepted M arch 2012

ABSTRACT
A methodology f or rock classification is presented t hat considers lithology and reservoir parameters on the basis of a combined f ractal analysis of well logs and mercury
porosimetry results with nuclear magnetic resonance outcomes. A s andy-shaly thinly-bedded Miocene gas bearing f ormation in the Carpathian Foredeep is investigated.
Fractal correlation dimensions D calculated for standard logs are used to distinguish sandstone as the most homogeneous lithological group with the highest porosity.
The fractal analysis also confirmed observations of gas accumulations in sandstone, shaly sandstone and s andy claystone as rocks of high porosity.
The results of two laboratory methods are combined t o improve r eservoir properties assessment and evaluate movable media in pore space; this technique
was based on the similarity of mercury porosimetry results plotted as cumulative intrusion volume versus pressure or pore diameter and
also the curves of cumulative porosity and transverse relaxation time distributions using nuclear magnetic resonance. Close values of porosity f rom logs,
recorded in situ and in laboratory measurements, provide the link between fractal analysis and porosimetry and nuclear magnetic resonance measurements.

Key words: Well logging, Data p rocessing, Fractal correlation dimension, Mercury porosimetry, Nuclear magnetic resonance