Отправлено: 09.12.09 11:14. Заголовок: Numerical simulation of rock electrical properties based on digital cores

Numerical simulation of rock electrical properties based on digital cores
Applied Geophysics
Chinese Geophysical Society
ISSN 1672-7975 (Print) 1993-0658 (Online)
Номер Volume 6, Number 1 / Март 2009 г.
DOI 10.1007/s11770-009-0001-6
pp. 1-7
Subject Collection Наука о Земле и окружающей среде
SpringerLink 14 марта 2009 г.
Xuefeng Liu1 , Jianmeng Sun1 and Haitao Wang1

(1) College of Geo-resource and Information, China University of Petroleum, Dongying, 257061, China

Received: 31 August 2008 Revised: 16 October 2008 Published online: 14 March 2009

Abstract In this paper, we obtained three dimensional digital cores using X-ray CT to describe the rock microstructure and applied the open morphology algorithm to simulate oil and formation water distribution in the pore space at different water saturations during the oil-displacing water flood process. The resistivity, formation factor, and resistivity index of rocks were calculated using the finite element method (FEM) and we studied the effect of rock wettability on electrical properties. The numerical simulation results indicate that the simulated formation factor and resistivity index of the water wet rock agrees well with experiments over the whole range of water saturation and extends the traditional resistivity experiment. The rock wettablilty has a large influence on the rock resistivity index. The resistivity and saturation exponent of oil wet rock are obviously larger than three of water wet rock.
Keyword digital core - morphology - wettability - resistivity index

The paper is sponsored by NSFC (Grant No. 40574030) and CNPC research project (Grant No. 06A30102).
Liu Xuefeng received his bachelor degree in physics from Qufu Normal University in 2001. He is currently a doctoral candidate majoring in Geological Resource and Geological Engineering at the China University of Petroleum (East China). His research interests are numerical simulation of petrolphysics.