Editing Well logging (section)

====Borehole imaging====
{{Main|Borehole Image Logs}}

The term "borehole imaging" refers to those logging and data-processing methods that are used to produce centimeter-scale images of the borehole wall and the rocks that make it up. The context is, therefore, that of open hole, but some of the tools are closely related to their cased-hole equivalents. Borehole imaging has been one of the most rapidly advancing technologies in wireline well logging. The applications range from detailed reservoir description through reservoir performance to enhanced hydrocarbon recovery. Specific applications are fracture identification,<ref>Taherdangkoo, R., & Abdideh, M. (2016). Application of wavelet transform to detect fractured zones using conventional well logs data (Case study: Southwest of Iran). International Journal of Petroleum Engineering, 2(2), 125-139.</ref> analysis of small-scale sedimentological features, evaluation of net pay in thinly bedded formations, and the identification of breakouts (irregularities in the borehole wall that are aligned with the minimum horizontal stress and appear where stresses around the wellbore exceed the compressive strength of the rock).<ref>{{Cite web|url=http://petrowiki.org/Borehole_imaging|title = Borehole imaging|date = 2 July 2015}}</ref>
The subject area can be classified into four parts:
# Optical imaging
# Acoustic imaging
# Electrical imaging
# Methods that draw on both acoustic and electrical imaging techniques using the same logging tool