AlbianA geologic period, the uppermost sub-division of the early or lower Cretaceous period, that extends from about c.112 Mya (million years ago) to 100 Mya
Aptian A geologic period, a sub-division of the early or lower Cretaceous period, that extends from about c.125 Mya (million years ago) to 112 Mya
Appraisal wellAn appraisal well is drilled to assess the characteristics (e.g. flow rate, areal extent) of a discovered oil or gas accumulation
bblBarrel of oil; equivalent to 42 US gallons
bcfBillion cubic feet of gas
boeBarrels of oil equivalent where the gas component is converted into an equivalent amount of oil using a conversion rate of approximately 6mcf to one barrel of oil
boepdBarrels of oil equivalent per day
bopdBarrels of oil per day
Carbonate RocksRocks made of particles (composed >50% carbonate minerals - limestones (CaCO3) and dolomites (CaMg(CO3)2)) embedded in a cement. They make up 10 - 15% of sedimentary rocks and dissolve in dilute acidic groundwater. Most carbonate rocks result from the accumulation of bioclasts created by calcareous organisms and therefore originate in areas favouring biological activity i.e. in shallow and warm seas in areas with little to no clastic input. In present day Earth conditions these would be primarily areas limited to ±40 latitude
CretaceousA geologic period that extends from about c.145 Mya (million years ago) to 65 Mya
CSRCorporate Social Responsibility
Development wellA development well is drilled within the proved area of an oil or gas reservoir for the purpose of producing hydrocarbons
E&PExploration and production
Exploration wellAn exploration well is drilled to find and test potential oil or gas accumulations in an unproved area
FormationUsed to describe a particular sequence of rocks of similar character recognizable over distance. Also an oil industry term used to describe a particular layer being tested for oil and gas
FractureA break in the rock that can serve as both a migration pathway and a reservoir for gas, oil and water
GrabenA fault bonded structural feature in the sub-surface resulting from extension. It may serve as a site for thick accumulation of hydrocarbon prospective rocks
HSEHealth, Safety and Environment
HydrocarbonAny liquid or gas made up of an appreciable volume of combustible organic compounds of hydrogen and carbon, such as any of those that are the chief components of petroleum and natural gas.
KarstThe topography that describes the erosion surfaces and caves that typically develop due to the solubility of carbonate rocks in dilute acidic groundwater
km2Square kilometres
JurassicA geologic period that extends from about c.200 Mya (million years ago) to 145
mcfThousand cubic feet of gas
mcf/dThousand cubic feet of gas per day
mmbblMillions of barrels of oil
mmboeMillions of barrels of oil equivalent
mmcf/dMillions of cubic feet of gas per day
mmstbMillions of stock tank barrels
NGLsNatural Gas Liquids
NGONon-governmental organisation
OperatorRuns the day to day hydrocarbon exploration and production programme on behalf of the working interest holders in the project
PermeableA rock that allows fluid to pass through it easily is said to be permeable
PetroleumA flammable mixture of gaseous, liquid, and solid hydrocarbons that occurs naturally beneath the Earth's surface capable of being separated into various fractions
PlatformA continental area covered by relatively flat or gently tilted, sedimentary strata
Prospective ResourcesAn estimate of the potential oil and gas volumes thought to be present in an undrilled area.
PSCProduction Sharing Contract
psiPounds per square inch (pressure)
ReefA build-up of carbonate rocks in tropical waters developed through biotic processes dominated by corals and calcareous algae
ReservoirA rock formation with sufficient holes (porosity) to hold and store oil until it is discovered and sufficient permeability to allow the oil to be produced economically. A reservoir rock hosts the hydrocarbon accumulation in the subsurface and may consist of any number of rock types (although it is often sandstone). Also includes permeable and porous fractured rock and coal seams
SectionA stratigraphic sequence encountered in a well
SeismicThe seismic process records the time taken for a sound wave to travel from the surface of the earth to a sub-surface rock layer and then back again. The data collected can be processed to provide a pictorial representation of the sub-surface rock layers and is used extensively in hydrocarbon exploration and production. In a 2D seismic survey, several seismic lines are recorded to yield individual cross-sections. In a 3D seismic survey, multiple closely spaced seismic lines are recorded and the high density of cross sections are interpolated to yield detailed subsurface maps on which exploration prospects can be delineated.
Stock tank barrelA barrel of oil measured at standard temperature (60o F) and pressure (14.7 psi)
STOIIPStock tank oil initially-in-place
TertiaryA geologic period that extends from about c.65 Mya (million years ago) to beginning of the last ice age.
WIWorking interest