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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...

current was being passed through the logging cables down in the well. This led to the discovery of the spontaneous potential (SP) which was as important...

on the gamma ray log. Thus gamma ray logs cannot be said to make good lithological logs by themselves, but in practice, gamma ray logs are compared side-by-side...

Mud logging is the creation of a detailed record (well log) of a borehole by examining the cuttings of rock brought to the surface by the circulating drilling...

Spontaneous potentials are often measured down boreholes for formation evaluation in the oil and gas industry, and they can also be measured along the...

Sonic logging is a well logging tool that provides a formation’s interval transit time, designated as Δ t {\displaystyle {\Delta }t} , which is a measure...

Resistivity logging is a method of well logging that works by characterizing the rock or sediment in a borehole by measuring its electrical resistivity...

Microblogging offers a portable communication mode that feels organic and spontaneous to many users. It has captured the public imagination, in part because...

A caliper log is a well logging tool that provides a continuous measurement of the size and shape of a borehole along its depth and is commonly used in...

of a viral video who visited a storm shelter in Houston and formed a spontaneous gospel choir), performing "Lean on Me" in support of Hurricane Harvey...

film No One Will Save You and the 2020 dark comedy coming-of-age film Spontaneous. His previous writing credits include Love and Monsters (2020), Underwater...

Logging while drilling (LWD) is a technique of conveying well logging tools into the well borehole downhole as part of the bottom hole assembly (BHA)...

is H ( X ) := − ∑ x ∈ X p ( x ) log ⁡ p ( x ) , {\displaystyle \mathrm {H} (X):=-\sum _{x\in {\mathcal {X}}}p(x)\log p(x),} where Σ {\displaystyle \Sigma...

change in log ⁡ Z {\displaystyle \log Z} : d ( log ⁡ Z ) = ∂ log ⁡ Z ∂ β d β + ∂ log ⁡ Z ∂ x d x = − U d β + β X d x . {\displaystyle d(\log Z)={\frac...

Density logging is a well logging tool that can provide a continuous record of a formation's bulk density along the length of a borehole. In geology,...

pressure log PSM – process safety management PSP – pseudostatic spontaneous potential PSP – positive sealing plug PSPL – PSP leak detection log PSSR – pre-startup...

of the First Great Awakening, Log College graduates were adherents of the New Side position that emphasized spontaneity and experiential devotion in contrast...

eigenvectors, but the eigenvalues log 2 ⁡ ( λ 1 ) , ⋯ , log 2 ⁡ ( λ n ) {\displaystyle \log _{2}(\lambda _{1}),\cdots ,\log _{2}(\lambda _{n})} . The Shannon...

a device that produces an electric current from energy released by a spontaneous redox reaction. This kind of cell includes the Galvanic cell or Voltaic...

nucleus), and spontaneous fission, in which a heavy nucleus splits into two (or more) large fragments and an assorted number of neutrons. Spontaneous fission...