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Spontaneous potential log, commonly called the self potential log or SP log, is a passive measurement taken by oil industry well loggers to characterise rock formation properties. The log works by measuring small electric potentials (measured in millivolts) between depths with in the borehole and a grounded electrode at the surface.
As established earlier, static SP is defined as follow: SSP = −K log (R mfe /R we) Static SP (SSP) can be obtained directly from the SP curve if the bed is clean, thick, porous, permeable, and only moderately invaded. When these conditions are not met, the recorded SP will need to be corrected. Various correction charts are available for this ...
Well logging, also known as borehole logging is the practice of making a detailed record (a well log) of the geologic formations penetrated by a borehole.The log may be based either on visual inspection of samples brought to the surface (geological logs) or on physical measurements made by instruments lowered into the hole (geophysical logs).
As the SP logging tool is drawn up the hole it measures the voltage difference between the reference stake and the mud opposite shale and sandstone or limestone sections. The resulting log curve reflects the permeability of the rocks and, indirectly, their lithology. SP curves degrade over time, as the ions diffuse up and down the mud column.
ALC – vertical seismic profile acoustic log calibration report; ALLMS – anchor leg load monitoring system; ALQ – additional living quarters; ALR – acoustic log report; ALT – altered; AM – asset management; aMDEA – activated methyldiethanolamine; AMS – auxiliary measurement service log; auxiliary measurement sonde (temperature)
SP poorly graded sand sand with >12% fines SM silty sand SC clayey sand Fine grained soils 50% or more passing the No.200 (0.075 mm) sieve silt and clay liquid limit < 50 inorganic: ML silt CL lean clay organic: OL organic silt, organic clay: silt and clay liquid limit ≥ 50 inorganic MH elastic silt CH fat clay organic OH organic clay ...
Gamma ray logging is a method of measuring naturally occurring gamma radiation to characterize the rock or sediment in a borehole or drill hole. It is a wireline logging method used in mining, mineral exploration, water-well drilling, for formation evaluation in oil and gas well drilling and for other related purposes. [ 1 ]
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