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Sales Gas

Dry gas after deducting own use and flared gas.

Salt Dome

A substance mound of salt that is either a piercement or a nonpiercement dome. Piercement domes thrust upward into the formations above them, causing faulting; nonpiercement domes are produced by local thickening of the salt beds and merely lift the overlying formations to form an anticline.

Sample

Cuttings of a rock formation broken up by the drill bit and brought to the surface by the drilling mud.

Sandstone

A sedimentary rock consisting almost entirely of sand sized grains of quartz.

Saturation

The percentage of a rock’s pore space occupied by a particular fluid, thus there is oil saturation, water saturation, and gas saturation.

Secondary Recovery

Any method of increasing ultimate recovery of oil or condensate by the application of outside energy.

Sedimentary Rock

Rock formed by the laying down of matter by the seas, streams, or lakes; sediment deposited in bodies of water through geological ages; limestone, sandstone and shale are sedimentary rocks.

Seepage (Geological)

Over a period of geological time gas and/or oil can reach the surface through zones of weakness. Generally associated with faults.

Seismic Survey

Geophysical information on subsurface rock formations using a seismograph; the investigation of underground strata by recording and analysing shock waves artificially produced and reflected from subsurface bodies of rock.

Separator

An apparatus for separating well fluids into gaseous and liquid components. Separators segregate oil, gas, and water with the aid, at times, of chemical treatment and the application of heat.

Shale

A sedimentary rock composed of very small particles of clay, mud, and sand.

Show Of Oil

A small amount of oil in a well or rock sample.

Shut-In Pressure

Pressure measured after a well has been shut in for a period.

Sour Gas

Gas containing acid gases, principally hydrogen sulphide and carbon dioxide.

Spud

To begin the actual drilling of a well.

Step-Out Well

A well in an unproved or semi-proved area in an attempt to extend the productive limits of a field.

Stimulation

The technique of getting more production from a formation, by the use of acidizing, hydraulic fracturing, or other method.

Stratigraphy

Pertaining to rock strata and their characteristics and geometry.

Stratigraphy Traps

A type of reservoir capable of holding gas or oil that is formed by a change in characteristics of the formation - loss of porosity and permeability, or a break in its continuity - which forms the trap or reservoir.

Swab

To clean out the bore hole of a well with a special tool attached to a wire line, and to attempt to start the well producing. The tool is called a RABBIT.

Sweet Oil

Crude oil that contains virtually no sulphur or hydrogen sulfide and having a good colour.

Syncrude

A crude oil made from coal or gas

Syngas

Petrol made from coal or gas.

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