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1. n. [Geophysics]

One of a number of locations or stations at the surface of the Earth at which a seismic source is activated.

See: acquisitionamplitude variation with offsetcommon midpoint methoddepth migrationdropoutfoldmigrationoffsetreceiverseismic recordseismogramshot depthspacingspreadsynthetic seismogram

Shothole rig.

2. n. [Geophysics]

Naturally occurring (static) electrical potential in the Earth. Spontaneous potentials are usually caused by charge separation in clay or other minerals, by the presence of a semipermeable interface impeding the diffusion of ions through the pore space of rocks, or by natural flow of a conducting fluid (salty water) through the rocks. Variations in SP can be measured in the field and in wellbores to determine variations of ionic concentration in pore fluids of rocks.

Alternate Form: spontaneous potential

3. n. [Formation Evaluation]

An abbreviation of spontaneous potential.

Alternate Form: spontaneous potential

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