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A method for characterizing basement rocks from borehole images

Ann Murray
A method for characterizing basement rocks from borehole images (in Industrial structural geology; principles, techniques and integration, F. L. Richards (editor), N. J. Richardson (editor), S. J. Rippington (editor), R. W. Wilson (editor) and C. E. Bond (editor))
Special Publication - Geological Society of London (February 2015) 421 (1): 109-124


Basement rocks tend to have negligible primary (rock matrix) porosity and, where present, almost all porosity is fracture-related. An insight into fracture type and distribution is therefore of importance when attempting to predict potential flow zones in hydrocarbon reservoirs. In the absence of core, borehole images provide a proven means of characterizing fractures within basement rocks. This paper will concentrate upon the classification and characterization of basement structural elements, including fractures, faults and breccias, versus lithological elements, such as foliations and intrusion boundaries from borehole images. In addition, suggestions of how to differentiate present-day in-situ stress indicators from natural fractures will be made as these features may provide important information regarding open fracture set orientations. Examples of microresistivity and acoustic borehole images acquired in fractured igneous basement rocks from oil wells in Yemen will be presented together with a suggested methodology for their interpretation. The discussion will be based on hydrocarbon reservoirs; however, the methodology outlined can potentially have wider applications in, for example, groundwater pollution prevention schemes or groundwater extraction, radioactive waste disposal, geothermal energy resources and deep-drilling research programmes.

ISSN: 0305-8719
EISSN: 2041-4927
Serial Title: Special Publication - Geological Society of London
Serial Volume: 421
Serial Issue: 1
Title: A method for characterizing basement rocks from borehole images
Title: Industrial structural geology; principles, techniques and integration
Author(s): Murray, Ann
Author(s): Richards, F. L.editor
Author(s): Richardson, N. J.editor
Author(s): Rippington, S. J.editor
Author(s): Wilson, R. W.editor
Author(s): Bond, C. E.editor
Affiliation: Wildcat Geoscience, Aberdeenshire, United Kingdom
Pages: 109-124
Published: 20150206
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
Number of pages: 16
References: 38
Accession Number: 2015-024121
Categories: Applied geophysicsStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N12°30'00" - N18°30'00", E42°30'00" - E53°00'00"
Source Note: Online First
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201512
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