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Glossary of Terms - S
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Seismic survey: One of the tests used by geologists to determine if rocks have the properties needed to contain natural gas underground.
Seismogram: A two- or three-dimensional record made by a computer that measures changes in the density of rock. Geologists analyze seismograms and use them to visualize the rock layers beneath the earth’s surface that might reveal possible natural gas and/or oil traps.
Service line: A pipeline that carries natural gas from a distribution main up to the gas meter at a building.
Short circuit: The accidental and often dangerous flow of electric current from an unintended path back to the ground.
Solar energy: Electricity produced from the sun’s radiation.
Solid: Something that is hard and firm, and is not a liquid or gas. The molecules in a solid move slowly enough that they merely vibrate in place, allowing the solid to keep its shape and volume.
Source rock: Rock that supplies the natural gas in a gas trap. The gas was generated by the decomposition of tiny sea plants and animals that died millions of years ago, sank to the muddy bottom, and became part of this rock. Shale is a common source rock.
Spark: A flash of electricity leaping across an open space.
Steam: Water that has been heated to a vapor or gas.
Storage tanks: Large aboveground or underground tanks used to store natural gas for future use.
Substation: A facility where transformers lower electricity’s voltage.
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