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Aperture width estimation from acoustic televiewer log using 3 inches physical fractured borehole modelNormal access

Authors: S. Hwang, J. Shin and S. Jeong
Event name: 10th Congress of the Balkan Geophysical Society
Session: 3.4 Borehole methods
Publication date: 18 September 2019
DOI: 10.3997/2214-4609.201902639
Organisations: BGS, EAGE
Language: English
Info: Extended abstract, PDF ( 1.09Mb )
Price: € 20

Summary:
Borehole image logging has been used in various fields by measuring the dip and strike characteristics of the fractures. In this study, we conducted an experiment on the fractured borehole model to understand the possibility of estimating the aperture width using ATV data. We used ATV tool from Mount Sopris in the US and Robertson Geologging in the UK. The diameter of the borehole model is 3 inches, the dip angle are 0, 30, 60, and 90, respectively, and the aperture width are 1, 2, 3, and 5 mm, respectively. To investigate the relationship between the fracture borehole model and the ATV measured data, the amplitude and the travel-time data were carefully analysed. As a result of the test, in case of the dip angle is 0, the aperture width should be at least 3 mm. As the dip angle increases from 30 to 60 degrees, the aperture width can be more easily distinguished, but it tends to be measured larger than the actual. When the dip angle is 90 degrees, it is possible to distinguish the 2 mm aperture width. It is recommended that amplitude data be used rather than observational data when estimating aperture width


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