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History
Petroleum reservoir
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A petroleum reservoir or oil and gas reservoir is a subsurface accumulation of hydrocarbons contained in porous or fractured rock formations. Such reservoirs form when kerogen is created in surrounding rock by the presence of high heat and pressure in the Earth's crust.
An oil field with dozens of wells. This is the Summerland Oil Field, near Santa Barbara, California, before 1906
An oil field with dozens of wells. This is the Summerland Oil Field, near Santa Barbara, California, before 1906
Vučkovec Gas Field facility, Croatia
Vučkovec Gas Field facility, Croatia
The drillship Discoverer Enterprise is shown in the background, at work during exploratory phase of a new offshore field. The Offshore Support Vessel
The drillship Discoverer Enterprise is shown in the background, at work during exploratory phase of a new offshore field. The Offshore Support Vessel Toisa Perseus is shown in the foreground, illustrating part of the complex logistics of offshore oil and gas exploration and production.
Unconventional (oil and gas) reservoir
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Unconventional reservoirs, or unconventional resources are accumulations where oil and gas phases are tightly bound to the rock fabric by strong capillary forces, requiring specialised measures for evaluation and extraction.
Schematic cross-section of general types of oil and gas resources featuring unconventional as well as conventional reservoirs
Schematic cross-section of general types of oil and gas resources featuring unconventional as well as conventional reservoirs