Lecture items. Compositions of the Uphole- Downhole Instruments. Field Operation (Data Acquisition, Processing and Transmission) Log Runs Borehole Environment opposite a Permeable Zone. Structure of a Log head. Recording Format Images logs Basic reservoir characteristics.
When a hole is drilled into a formation, the rock and the fluids in it (rock-fluid system) are altered in the vicinity of the borehole. A well’s borehole and the rock surrounding it are contaminated by the drilling mud, which affects logging measurements. Figure 1 is a schematic illustration of a porous and permeable formation which is penetrated by a borehole filled with drilling mud.