Borehole image logs: Difference between revisions

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Borehole Imaging Logs are logging and data-processing methods used to produce two-dimensional, centimeter-scale images of a borehole wall and the rocks that make it up .These tools are limited to the open-hole environment. The applications where images are useful cover the full range the exploration and production (E&P) cycle from exploration through appraisal, development, and production to abandonment.

Specific applications are sedimentology, structural geology/tectonics, reservoir geomechanics and drilling, reservoir engineering.

The tools can be categorized a number of ways: energy source (electrical, acoustic, or nuclear); conveyance (wireline or logging while drilling (LWD)); and mud type (water-based mud (WMD) or oil-based mud (OBM)).

Image Basics

What 2 dimensional means

File:2DArrayToTadpoles.jpg

Image logs are 2 dimensional data sets meaning that there are multiple values recorded at each depth and at different positions around the borehole. When projected onto a plane (like a computer screen or sheet of paper a 2D image is created.^[1]

Tadpoles

File:Tadpoles2.jpg

The planar features are quantified with a tadpole map that relates depth with the dip angle and dip direction of the plane.

Curves to images

File:CurveToImage.jpg

The tool measures values that are recorded as a curve (or log). This curve is converted into a color strip that is merged with other strip from the tool to create the image.

Image normalization

File:StaticDynamicImages.jpg

The images can be normalized to a local color map to bring out hidden or subtle features.

References

^ Schlumberger Oilfield Review, vol. 27, no. 2, (Sept 2015), pages 4-20

[1] Schlumberger Oilfield Review, vol. 27, no. 2, (Sept 2015), pages 4-20

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-'''[[List of acronyms in oil and gas exploration and production|Borehole]] Imaging Logs''' are logging and [[Data processing|data-processing]] methods used to produce [[Two-dimensional space|two-dimensional]], centimeter-scale images of a borehole wall and the rocks that make it up .These tools are limited to the open-hole environment. The applications where images are useful cover the full range the [[E&P]] cycle from exploration through appraisal, development, and production to abandonment. <br />
+'''[[List of acronyms in oil and gas exploration and production|Borehole]] Imaging Logs''' are logging and [[Data processing|data-processing]] methods used to produce [[Two-dimensional space|two-dimensional]], centimeter-scale images of a borehole wall and the rocks that make it up .These tools are limited to the open-hole environment. The applications where images are useful cover the full range the exploration and production (E&P) cycle from exploration through appraisal, development, and production to abandonment.
 Specific applications are sedimentology, structural geology/tectonics, reservoir geomechanics and drilling, [[reservoir engineering]].