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Paper Information

Title: 

A NEW APPLIED METHOD IN INTERPRETATION OF SHALY FORMATIONS BY ANALYSIS OF WATER SATURATION MODELS

Type: PAPER
Author(s): HOSSEINPOUR SIAMI H.*,RAHIMI BAHAR A.A.
 
 *RESEARCH INSTITUTE OF PETROLEUM INDUSTRY, 1ST FLOOR, NO.7, HOVEIZEH ST., SHARIATI ST., TEHRAN, IRAN
 
Name of Seminar: PROCEEDING OF IRANIAN MINING ENGINEERING CONFERENCE
Type of Seminar:  CONFERENCE
Sponsor:  IRANIAN SOCIETY OF MINING ENGINEERING
Date:  2005Volume 1
 
 
Abstract: 

In this paper, methods are presented for extending Pickett plots to the analysis of (1) laminated, (2) dispersed, and (3) total shale models. The techniques involve the use of log-log crossplots of effective porosity versus true resistivity as affected by a shale group (Ash). Thus the methods can be readily extended to the analysis of naturally fractured reservoirs. Response equations for the above models have been written in such a way as to allow the generation of log-log plots from which values of waters saturation can be readily calculated. Three key advantages of the proposed methods are: (1) the value of m (porosity exponent) doesn’t have to be assumed equal to 2 (in fact, it can be determined from this analysis by trial and error); (2) water resistivity doesn’t have to be known in advanced, provided that the reservoir contains some water–bearing intervals; and (3) all shaly intervals being analyzed can be displayed in a signal log-log plot that includes porosity and water saturation even if shale volumes are changing continuously. Two examples are presented in detail. It is concluded that log-log crossplots provide powerful evaluation techniques for the analysis of laminated, dispersed, and total shale models.

 
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