The following is a list of notable companies in the petroleum industry that are engaged in South Africa Sasol · Sudan Sudapet · Tunisia Entreprise Tunisienne d'Activites Petroliere · Madagascar Oil · Tanzania Swala Oil and Gas(Tanzania)Plc  ‎Africa · ‎Asia · ‎Europe · ‎North America. See how our people, processes, and technologies are helping our clients find and produce oil and gas, safely and efficiently, in hydrocarbon basins worldwide. Jump to Oil and gas reserves - Hydrocarbon exploration (or oil and gas exploration) is the search by petroleum geologists and geophysicists for hydrocarbon deposits beneath the Earth's surface, such as oil and natural gas. Oil and gas exploration are grouped under the science of petroleum geology.‎Exploration methods · ‎Exploration risk · ‎Licensing · ‎Reserves and resources.


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Natural gas is often processed onsite while oil is piped to exploration oil and gas refinery before being offered for sale. Abandonment As exploratory sites are deemed unproductive or existing operations exhaust capacity, companies plug wells and attempt to restore the areas to environmental states that existed prior to drilling activities.

Oil companies often operate in joint ventures to spread the risk; one of the companies in the partnership is designated the operator who actually supervises exploration oil and gas work.

Tax and Royalty - Companies would pay a royalty on any oil produced, together with a profits tax which can have expenditure offset against it. In some cases there are also various bonuses and ground rents license fees payable to the government - for example a signature bonus payable at the start of the licence.

Oil and Gas Exploration

Licences are awarded in competitive bid rounds on the basis of either the size of the work programme number of wells, seismic etc.

There are also various bonuses to be paid.

Development expenditure is offset against production revenue. Service contract - This is when an oil company acts as a contractor for the host government, being paid to produce the hydrocarbons.

Reserves exploration oil and gas resources[ edit ] Resources are hydrocarbons which may or may not be produced in the future. A resource number may be assigned to an undrilled prospect or an unappraised discovery. Appraisal by drilling additional delineation wells or acquiring extra seismic data will confirm the size of the field and lead to project sanction.

Hydrocarbon exploration

At this point the relevant government body gives the oil company a production licence which enables the field to be developed. This is also the point at which oil reserves and gas reserves can be formally booked.


Oil and gas reserves[ edit ] Exploration oil and gas and gas reserves are defined as volumes that will be commercially recovered in the future. Reserves are separated into three categories: To be included in any reserves category, all commercial aspects must have been addressed, which includes government consent.

Technical issues alone separate proved from unproved categories. All reserve estimates involve some degree of uncertainty.

Oil and Gas Exploration | Schlumberger

Learn more To achieve our ambition in today's complex environment, our teams are constantly innovating to improve safety, enhance our exploration and production techniques and reduce our environmental impact while also cutting costs.

In addition, we have promoted actions to optimize production and extend the life of exploration oil and gas fields. An example is the Program for Increasing Operating Efficiency in the Campos Basin Proefwhich managed to reverse the downward trend in efficiency at the Campos Basin and Rio de Janeiro operating units.

The Associated Gas Utilization Optimization Program Poag has also contributed to improve the performance of exploration oil and gas units in Southeastern Brazil.

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