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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 ...
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.
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).
YouTube offers users the ability to view its videos on web pages outside their website. Each YouTube video is accompanied by a piece of HTML that can be used to embed it on any page on the Web. [95] This functionality is often used to embed YouTube videos in social networking pages and blogs.
/sp/, the sports board on the Internet forum 4chan; SP, a Japanese TV series; Game Boy Advance SP, an upgraded version of the Game Boy Advance handheld video game system, released in 2003; Standard Play, a magnetic tape speed used for VHS; Story Pirates, a podcast; Subdominant parallel, a type of musical chord
In 2007, Facebook launched Facebook Pages for brands and celebrities to interact with their fanbases. [ 48 ] [ 49 ] 100,000 Pages [ further explanation needed ] launched in November. [ 50 ] In June 2009, Facebook introduced a "Usernames" feature, allowing users to choose a unique nickname used in the URL for their personal profile, for easier ...
Logging is the beginning of a supply chain that provides raw material for many products societies worldwide use for housing, construction, energy, and consumer paper products. Logging systems are also used to manage forests, reduce the risk of wildfires, and restore ecosystem functions, [2] though their efficiency for these purposes has been ...