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The AAPG/Datapages Combined Publications Database

Houston Geological Society Bulletin


Houston Geological Society Bulletin, Volume 54, No. 07, March, 2012. Page 41 - 41.

ABSTRACT: Borehole Image Logs — A Useful Tool for Earth Scientists

Roger Reinmiller
Western Region Manager, Fronterra Geosciences

Borehole image logs have been around since the mid-1990s; they represent a well-understood technology. Recent technological advances have greatly expanded acquisition capabilities, Previous HitdataNext Hit sensitivity, and the ability to apply borehole image Previous HitdataNext Hit to complex reservoir systems. Borehole image logs have sub-centimeterscale resolution that can bring clarity to the structural and stratigraphic complexities of a Previous HitfieldNext Hit. As a result of the quantity of useful Previous HitdataNext Hit collected by this technique, borehole imaging is becoming a more frequent component of standard logging runs on exploration and development wells.

The strength of borehole image Previous HitdataNext Hit is that they reveal the spatial geometry of features such as bedding, channels, folds, faults, lithologic changes, and fracture networks. A borehole image provides Previous HitdataNext Hit similar to that derived from a core without the time, expense, or other issues of coring.

There are four main components of borehole image analyses:. Structural Bedding determination is used to identify changes in the spatial geometry of rock masses due to tectonic deformation and the presence of unconformities and sequence boundaries . In-situ Present Day Stress determination derives the spatial geometry of maximum and minimum horizontal compressive stress trajectories – a crucial element in designing effective well stimulations. Fracture / Fault Characterization is necessary for understanding a dominant permeability element in a reservoir. Finally, Stratigraphic Analysis is used to reconstruct depositional environments and sediment dispersal patterns which govern the spatial distribution of sand bodies. An Previous HitexampleNext Hit of fluvial and shoreface environments will demonstrate the utility of core / image facies comparisons. Using the analysis of multiple image logs in a Previous HitfieldNext Hit improves understanding of sand body geometry and facies distribution which will deliver better well placement and more efficient Previous HitfieldTop development.

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