Glossary

View terms and abbreviations used throughout this website

 

1P

Proved reserves

2P

Proved plus probable reserves

3P

Proved plus probable plus possible reserves

ABARE

Australian Bureau of Agricultural and Resource Economics

AD

Air drill

adsorb

To gather gas on a surface.

AIP

Australian Institute of Petroleum

air drill

Rotary drilling using air pumped down the drill string instead of circulating drilling fluid.

AMMA

Australian Mines & Metals Association

annulus

An annulus is the space between two concentric cylinders, for example, the two steel casings used in core hole drilling.

AMSL

Above mean sea level

APIA

Australian Pipeline Industry Association

APOGCE

Asia-Pacific Oil and Gas Conference and Exhibition (Society of Petroleum Engineers)

APPEA

Australian Petroleum Production and Exploration Association

appraisal

The drilling of a well or wells after the discovery of oil or gas to establish the limits of the reservoir, the productivity of wells in it and the properties of the oil or gas. See exploration, development, production.

appraisal well

A well or wells drilled to follow up a discovery and evaluate its commercial potential.

aquifer

Water-bearing structure.

aquitard

Structure through which water cannot pass.

ASEG

Australian Society of Exploration Geophysicists

ASP

Australian School of Petroleum

ASX

Australian Stock Exchange

basement

Unproductive rock underlying sedimentary rock.

basin

A basin is a large area holding a thick accumulation of sedimentary rock.

barrel/bbl

The standard unit of measurement for all production and sales. One barrel = 159 litres or 35 imperial gallons.

bcf

Billion cubic feet, a billion defined as 1,000,000,000. On average 1 bcf of sales gas = 1.055 petajoules.

boe

Barrels of oil equivalent. The factor used by Santos to convert volumes of different hydrocarbon production to barrels of oil equivalent.

bopd

Barrels of oil per day.

carbon dioxide equivalent (CO2 -e)

A measure of greenhouse gases (e.g. carbon dioxide, methane, nitrous oxide) with the equivalent global warming potential as carbon dioxide when measured over a specific time.

condensate

A natural gas liquid that occurs in association with natural gas and is mainly composed of pentane and heavier hydrocarbon fractions.

contingent resources

Those quantities of hydrocarbons which are estimated, on a given date, to be potentially recoverable from known accumulations, but which are not currently considered to be commercially recoverable. Contingent resources may be of a significant size, but still have constraints to development. These constraints, preventing the booking of reserves, may relate to lack of gas marketing arrangements or to technical, environmental or political barriers.\

crude oil

A general term for unrefined liquid petroleum or hydrocarbons.

the company

Santos Ltd and its subsidiaries.

CSG Coal seam gas.

Predominantly methane gas stored within coal deposits or seams.

D, D & A

Depreciation, depletion and amortisation of building, plant and equipment, exploration and development expenditure.

delineation well

Comprises two categories: near-field exploration wells and appraisal wells. Near-field exploration wells are wells located near existing fields/discoveries and have a higher expectation of success than wildcat exploration wells. These wells test independent structures or traps and have a higher risk of failure than appraisal or development wells. An appraisal well is a well drilled for the purpose of identifying extensions to known fields or discoveries.

development well

Wells designed to produce hydrocarbons from a gas or oil field within a proven productive reservoir defined by exploration or appraisal drilling.

EBIT

Earnings before interest and tax.

EBITDA

Earnings before interest and tax, depreciation, depletion and amortisation of building, plant and equipment, exploration and development expenditure and amortisation of goodwill.

finding cost per barrel of oil equivalent

Exploration and delineation expenditure per annum divided by reserve additions net of acquisitions and divestments.

hydrocarbons

Compounds containing only the elements hydrogen and carbon, which may exist as solids, liquids or gases.

Joules

Joules are the metric measurement unit for energy.

A gigajoule (GJ) is equal to 1 joule × 109
A terajoule (TJ) is equal to 1 joule × 1012
A petajoule (PJ) is equal to 1 joule × 1015

 

liquid hydrocarbons (liquids)

A sales product in liquid form; for example condensate and LPG.

LNG Liquefied natural gas.

Natural gas that has been liquefied by refrigeration to store or transport it. Generally, LNG comprises mainly methane.

lost-time injury frequency rate (LTIFR)

A statistical measure of health and safety performance, calculated a the number of hours worked. A lost-time injury is a work-related injury or illness that results in a persons disability, or time lost from work of one day shift or more.

LPG Liquefied petroleum gas.

A mixture of light hydrocarbons derived from oilbearing strata which is gaseous at normal temperatures but which has been liquefied by refrigeration or pressure to store or transport it. Generally, LPG comprises mainly propane and butane.

mbbls

Thousand barrels.

mean resource potential

The average of the range of recoverable resources.

mmbbls

Million barrels.

mmboe

Million barrels of oil equivalent.

mmscf/d

Million standard cubic feet per day.

Oil

A mixture of  liquid hydrocarbons of difference molecular weights.

petroleum liquids

Crude oil, condensate, or its derivative naphtha, and the liquefied petroleum gases propane and butane.

PJ

Petajoules. Joules are the metric measurement unit for energy. A petajoule equals 1,000,000,000,000,000 joules. The equivalent imperial measure to joules is British Thermal Units (BTU). One
kilojoule = 0.9478 BTU.

Proven reserves (1P)

Proven reserves (1P) are those reserves that, to a high degree of certainty (90% confidence), are recoverable. There is relatively little risk associated with these reserves. Proven developed reserves are reserves that can be recovered from existing wells with existing infrastructure and operating methods. Proven undeveloped reserves require development.

Proven plus Probable reserves (2P)

Proven plus Probable reserves (2P) are those reserves that analysis of geological and engineering data suggests are more likely than not to be recoverable. There is at least a 50% probability that reserves recovered will exceed Proven plus Probable reserves.

Proven, Probable plus Possible reserves (3P)

Proven, Probable plus Possible reserves (3P) are those reserves that, to a low degree of certainty (10% confidence), are recoverable. There is relatively high risk associated with these reserves.

proven, probable plus possible reserves contingent resources (2C)

Those quantities of hydrocarbons which are estimated, on a given date, to be potentially recoverable from known accumulations, but which are not currently considered to be commercially recoverable. Contingent resources may be of a significant size, but still have constraints to development. These constraints, preventing the booking of reserves, may relate to lack of gas marketing arrangements or to technical, environmental or political barriers.

PSC

Production sharing contract.

reserve replacement cost per barrel of oil equivalent

Exploration, delineation and development expenditure per annum divided by reserve additions net of acquisitions and divestments. Development includes all development and fixed asset expenditure net of stay-in-business and corporate capital expenditure.

resource potential

Resource potential refers to those quantities of petroleum yet to be discovered. It may refer to single opportunities or a group of opportunities.

ROAE

Return on average equity.

ROACE

Return on average capital employed.

Santos

Santos Ltd and its subsidiaries.

seismic survey

A survey used to gain an understanding of rock formations beneath the earth’s surface.

tcf

Trillion cubic feet.

TJ

Terajoules. Joules are the metric measurement unit for energy. A terajoule equals 1,000,000,000,000 joules.

total recordable case frequency rate (TRCFR)

A statistical measure of safety performance. Total recordable case frequency rate is calculated as the total number of recordable cases (medical treatment injuries and lost time injuries) per million hours worked. A lost time injury is a work-related injury or illness that results, or would result, in a permanent disability or time lost of one complete shift or day or more any time after the injury or illness. A medical treatment injury is a work-related injury or illness, other than a lost time injury, where the injury is serious enough to require more than minor first aid treatment. Santos classifies injuries that result in modified duties as medical treatment injuries.

wildcat exploration

Exploration wells testing new play concepts or structures distanced from current fields.

 

Conversion

crude oil 1 barrel = 1 boe
sales gas 1 petajoule = 171,937 boe
condensate/naphtha 1 barrel = 0.935 boe
LPG 1 tonne = 8.458 boe


Santos’ online Conversion Calculator instantly computes equivalent values of the most common units of measurement in the oil and gas industry.