Skip to main content
Top of the Page

3-D Study of Resistivity Tool Responses in Formations with V

This paper summarizes 3-D modeling and analysis results of a study on the unusual responses from multiple resistivity tools in the Bossier Formation of the Haynesville Shale Play in Louisiana. The resistivity tools included a Multi-Laterolog, an Array Induction Log, and a Multi-Component Induction Log.
The Multi-Laterolog and Array Induction Log responses indicate that the apparent resistivity increases with increasing depth of investigation (DOI). The observed curve separation from different sub-arrays could not be explained by mud invasion or a single drilling-induced fracture. To explain this effect, a model with a series of parallel vertical fractures or vertical, thin sand beds filled with gas was proposed and investigated. Good agreement between modeling results and logs was achieved. Further studies also indicated that the fracture model was reduced to a homogeneous model with horizontal transverse isotropy (HTI) when the fracture width decreased while keeping a fixed volume ratio with respect to the conductive formation.
The fracture model alone, however, cannot explain the increase of apparent conductivity with increasing frequency (the “anti-skin” effect) in some induction instrument responses. Extra-large dielectric permittivity, in combination with a strong azimuthal effect, must be included to explain the abnormal anti- skin effect as well as the unusual azimuthal effect in the frequency spectra of the Multi-Component Induction logs. This extremely large anisotropy in permittivity can be caused by the vertical fractures and their interaction with certain formation components, which eventually causes an unusually high induced polarization effect along a particular direction.
Discounted member price: 1.00
10.00
You could save: 90.0%
Back to Top
SPWLA Business Office Address
8866 Gulf Freeway, Suite 320
Houston, TX 77017

SPWLA Contact Numbers
Phone: +1 (713) 947-8727
Fax: +1 (713) 947-8747

Copyright 1959 – 2024 SPWLA

Terms of Use  |  Privacy & Cookie Policy

Our vision is to advance the science of formation evaluation through electrical, nuclear, lithological, and other well logging techniques; to promote the proper application of these techniques to exploration for and exploitation of gas, oil and other naturally occurring substances; to maintain high ethical standards and to further the interests of persons professionally engaged in these endeavors. With the support of our Oil and Gas, Service, Software and Educational Institutions we can make a difference in the industry.