Changes

Borehole imaging tools such as the Formation MicroScanner are invaluable for detailed purposes, including bedding character and sedimentary structures, but are much less commonly available. (For more details, see [[Borehole imaging devices]].)

Borehole imaging tools such as the Formation MicroScanner are invaluable for detailed purposes, including bedding character and sedimentary structures, but are much less commonly available. (For more details, see [[Borehole imaging devices]].)

==[[Basic open hole tools#Gamma ray|Gamma ray]] logs==

==Gamma ray logs==

The common radioactive elements—potassium, thorium, and uranium—are normally insignificant in reservoir fluids, whereas they are important components of the rock system, especially of clay minerals. Gamma ray logs are therefore a good indicator of mineralogy.

The common radioactive elements—potassium, thorium, and uranium—are normally insignificant in reservoir fluids, whereas they are important components of the rock system, especially of clay minerals. [[Basic open hole tools#Gamma ray|Gamma ray]] logs are therefore a good indicator of mineralogy.

===Lithological responses===

===Lithological responses===