Image Log interpretation

Interpretation of micro-resistivity and of ultrasonic borehole images logs is a cornerstone of our services. Using  Image Log software we interpret fractures, in-situ stress indicators and lithofacies. We supply results which underpin fracture models and support appraisal activities such as selection of perforation or testing intervals.

The image logs are an important instrument useful to characterize, in geological terms, the different reservoirs, in particular over un-cored intervals or when standard electric logs do not work properly or they are unable to help in a detailed reservoir characterization. Image logs can supply not only a geometrical information (3D distribution: azimuth, spacing…) of the features that cross the borehole (structural, sedimentological and diagenetic) but also a geological insight into the reservoir geology.

The main objectives of this interpretation are:

• The interpretation of the main depositional and structural features that can be observed in the image log;
• Perform a statistical analysis of the distribution of the interpreted features (to identify trends or geological characteristics);
• Identify and characterize the different trends and try to understand the present day stress field.

The loading, processing and interpretation of Image Log are carried out using either the WellCAD™ software produced by Advanced Logic Technology (ALT) (www.alt.lu) or the Geolog™ software by Emerson. Both software are PC based composite log package, which combines comprehensive graphic editing mechanisms and data processing tools. The software can handle borehole image data from different contractors/service providers (Schlumberger, Halliburton, Weatherford, BakerHughes/Atlas, etc.) a variety of tools, resistivity and acoustic, including acoustic televiewer, optical televiewer, corescanned images, FMI, OBMI, FMS, CAST, EI-CBIL, UBI, CMI, STAR, DOBMI, OMRI, XRMI, Earth Imager and Sondex MIT