Transition zone
An area in which water is too shallow for acquisition of offshore seismic data with towed streamers, such as near the shoreline
Transmission system, natural gas transmission system (Israel)
As per the Israeli Gas Law: pipelines for the transmission of natural gas at high pressure, over land or in coastal waters, and the gas installations connected thereto, including installations for the reduction of pressure to low pressure for connection of a distribution network or of someone else’s gas installation thereto, all up to the …
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Transparency, (lack of transparency)
The tendency for price signals to be easily visible to all participants and for market pressures to be quickly reflected in price levels.
Traps (trapped)
Sedimentary or tectonic structure where oil and/or natural gas has accumulated. These are structural highs where a porous rock unit is capped by an impermeable rock unit. Oil and gas trapped within the porous rock unit migrate to a high point in the structure because of their low density. A trap is any feature or …
True vertical depth
The vertical distance from a point in the well (usually the current or final depth) to a point at the surface, usually the elevation of the rotary kelly bushing. This is one of two primary depth measurements used by the drillers, the other being measured depth. TVD is important in determining bottomhole pressures
Tubing
A relatively small-diameter pipe that is run into a well to serve as a conduit for the passage of oil and gas to the surface
Thermal megawatt, megawatt thermal
MWt refers to thermal output from a reactor or heat source (eg the gross heat output of a reactor itself, typically three times the MWe figure).
Thermogenic gas
Two distinct processes produce hydrocarbon gas: biogenic and thermogenic degradation of organic matter. Biogenic gas is formed at shallow depths. In contrast, thermogenic gas is formed at deeper depths by: (1) thermal cracking of sedimentary organic matter into hydrocarbon liquids and gas and (2) thermal cracking of oil at high temperatures into gas. If a …
Tie-back; Tieback; Tie back
Connection of a satellite subsea development (smaller field) to an existing infrastructure
Tight gas; Tght natural gas; Tight reservoir; Tight natural gas reservoir
This is gas that is stuck in a very tight formation underground, trapped in unusually impermeable, hard rock, or in a sandstone or limestone formation that is unusually impermeable and non-porous (tight sand). Tight gas sands is one type of unconventional reservoirs. Typical unconventional reservoirs include also coal bed methane, heavy oil and gas shales. …
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