Formation MicroScanner images record changes in rock resistivity caused by variations in [[porosity]] and clay content of a small rock volume in the vicinity of the borehole wall. Increased pad stand-off due to mudcake buildup on the borehole wall may decrease the spatial resolution, while abrupt changes in tool movement may produce a local misalignment or sawtooth effect in the layers ([[:file:borehole-imaging-devices_fig7.png|Figure 7]]). Important bedding types and surfaces can be identified and measured for their dip and azimuth ([[:file:borehole-imaging-devices_fig8.png|Figure 8]]), as are fractures ([[:file:borehole-imaging-devices_fig9.png|Figure 9]]) and stylolites ([[:file:borehole-imaging-devices_fig10.png|Figure 10]]). Faults are often readily recognized on Formation MicroScanner images because of the offset of rock types across the fault plane. | Formation MicroScanner images record changes in rock resistivity caused by variations in [[porosity]] and clay content of a small rock volume in the vicinity of the borehole wall. Increased pad stand-off due to mudcake buildup on the borehole wall may decrease the spatial resolution, while abrupt changes in tool movement may produce a local misalignment or sawtooth effect in the layers ([[:file:borehole-imaging-devices_fig7.png|Figure 7]]). Important bedding types and surfaces can be identified and measured for their dip and azimuth ([[:file:borehole-imaging-devices_fig8.png|Figure 8]]), as are fractures ([[:file:borehole-imaging-devices_fig9.png|Figure 9]]) and stylolites ([[:file:borehole-imaging-devices_fig10.png|Figure 10]]). Faults are often readily recognized on Formation MicroScanner images because of the offset of rock types across the fault plane. |