Please enable JavaScript for this site to function properly.
OnePetro
  • Help
  • About us
  • Contact us
Menu
  • Home
  • Journals
  • Conferences
  • Log in / Register

Log in to your subscription

and
Advanced search Show search help
  • Full text
  • Author
  • Company/Institution
  • Publisher
  • Journal
  • Conference
Boolean operators
This OR that
This AND that
This NOT that
Must include "This" and "That"
This That
Must not include "That"
This -That
"This" is optional
This +That
Exact phrase "This That"
"This That"
Grouping
(this AND that) OR (that AND other)
Specifying fields
publisher:"Publisher Name"
author:(Smith OR Jones)

Multi-Frequency Interpretation of Electric Resistivity and Dielectric Permittivity Measurements for Simultaneous Assessment of Porosity, Water Saturation, and Wettability

Authors
Artur Posenato Garcia (The University of Texas at Austin) | Zoya Heidari (The University of Texas at Austin) | Carlos Torres-Verdin (The University of Texas at Austin)
Document ID
SPWLA-2019-III
Publisher
Society of Petrophysicists and Well-Log Analysts
Source
SPWLA 60th Annual Logging Symposium, 15-19 June, The Woodlands, Texas, USA
Publication Date
2019
Document Type
Conference Paper
Language
English
Copyright
2019. held jointly by the Society of Petrophysicists and Well Log Analysts (SPWLA) and the submitting authors
Disciplines
Keywords
Downloads
7 in the last 30 days
179 since 2007
Show more detail
Price: USD 10.00

ABSTRACT

Broadband electric resistivity and dielectric permittivity measurements are affected by combined effects of rock fabric, composition, fluid saturation and distribution, and interfacial polarization mechanisms. An integrated multi-frequency interpretation of electrical measurements can provide information about the dominant polarization mechanisms, which are linked to grain size, solid-fluid interfacial properties, porosity, fluid saturations, and wettability. In this work, we propose to narrow down the knowledge gap in interpretation of broadband dielectric measurements in water-, oil-, and mixed-wet formations by introducing a new interpretation workflow for simultaneous assessment of porosity, fluid saturations, and wettability. The objectives of this paper include (a) to introduce a new rock physics model for broadband characterization of dielectric measurements incorporating the combined effects of grain size, porosity, water saturation, wettability, and interfacial polarization, and (b) to develop a new interpretation workflow based on an inversion algorithm capable of simultaneously estimating porosity, water saturation, and wettability of the formation uniquely from multi-frequency electrical resistivity and dielectric permittivity measurements.

We introduce a rock-physics model for broadband characterization of permittivity measurements by integrating a mechanistic model of electrolyte-solid interfacial polarization, on water- and oil-wet grains, with bulk properties of fluids and grains. Then, we develop a new interpretation workflow for estimating porosity, fluid saturations, and wettability of the formation. These properties are obtained by minimizing an objective function using a combination of downhill gradient-descent and evolutionary methods.

We successfully applied the introduced interpretation workflow to multi-frequency electrical resistivity/permittivity measurements performed on different rock samples at different wettability conditions and different levels of water saturation. The experimental measurements of complex resistivity/permittivity, performed in the frequency interval from 100 Hz to 10 MHz, were in agreement with values obtained from the proposed analytical workflow. Finally, wettability, saturation, and porosity of the samples were simultaneously estimated by applying the new interpretation workflow. It should also be noted that all the parameters required by the introduced workflow are associated with physical mechanisms at microscopic-and pore-scale domains or realistic and quantitative pore geometry features of the rock. A unique contribution of the new workflow is that it honors rock fabric and minimizes the need for extensive calibration efforts.

File Size  2 MBNumber of Pages   18

Other Resources

Looking for more? 

Some of the OnePetro partner societies have developed subject- specific wikis that may help.


 


PetroWiki was initially created from the seven volume  Petroleum Engineering Handbook (PEH) published by the  Society of Petroleum Engineers (SPE).








The SEG Wiki is a useful collection of information for working geophysicists, educators, and students in the field of geophysics. The initial content has been derived from : Robert E. Sheriff's Encyclopedic Dictionary of Applied Geophysics, fourth edition.

  • Home
  • Journals
  • Conferences
  • Copyright © SPE All rights reserved
  • About us
  • Contact us
  • Help
  • Terms of use
  • Publishers
  • Content Coverage
  • Privacy
  Administration log in