Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

The Effect of Lithology in Defining Archie's Parameters in the Rock Zones of Asmari in a Carbonate Reservoir of Southwest Iran

Document Type : Original Research Paper

Authors
S Tabasi 1
A KamkarRouhani 2
M.M Khorasani 3
1 Ph.D. Student, Faculty of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran
2 Associate Proffesor, Faculty of Mining, Petroleum and geophysics, Shahrood University of Technology, Shahrood, Iran
3 M.Sc., NIOC Exploration, Tehran, Iran
10.22071/gsj.2015.41716
Abstract
Archie’s equation, which is the most fundamental equation for water saturation calculation,consists of three factors: Cementation factor (m), saturation exponent (n) and tortuosity (a). Cementation factor is a function of the shape of pores. Hence, the study of pore type is important in determining the Archie’s coefficients. In order to achieve more precise and reliable results in Archie’s coefficient determination and then water saturation accurately, the rocks must be rated based on texture and porosity type, where the coefficients should be constrained for each class. In this paper, fractal method is used to rate the resistivity log data and calculate Archie’s coefficient in an exploration well of a hydrocarbon reservoir in southwest of Iran. The results show three different zones based on porosity type and texture of the rocks. Then the Genetic algorithm method is used to calculate the Archie’s coefficients in each of the zones separately. The results show that this method is able to consider the complex behavior of each of the coefficients in the calculations.
Keywords
Hydrocarbon
fractal
Resistivity log
Genetic algorithm
Scientific Quarterly Journal of Geosciences
Volume 24, Issue 96 - Serial Number 96
No. 96, Summer 2015
Summer 2015
Pages 159-166