1,705
edits
Changes
Jump to navigation
Jump to search
Initial import
{{publication
| image = exploring-for-oil-and-gas-traps.png
| width = 120px
| series = Treatise in Petroleum Geology
| title = Exploring for Oil and Gas Traps
| part = Predicting the occurrence of oil and gas traps
| chapter = Predicting reservoir system quality and performance
| frompg = 9-1
| topg = 9-156
| author = Dan J. Hartmann, Edward A. Beaumont
| link = http://archives.datapages.com/data/specpubs/beaumont/ch09/ch09.htm
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
The term “reservoir” creates confusion between different disciplines. Explorationists apply the term to mean a porous and permeable rock regardless of the fluid it contains. Reservoir engineers apply the term to mean a rock that contains hydrocarbons and associated fluids. This difference in meanings can cause problems for multidisciplinary teams unless the terminology is clear.
==Reservoir system components==
In this discussion, a reservoir system is a water–hydrocarbon system contained within the pores of a rock unit. A reservoir system has three main components: a reservoir, an aquifer, and a transition zone (interface) between the two.
* A '''reservoir''' is a porous and permeable rock saturated with oil or gas in [[buoyancy pressure]] equilibrium with a free water level (zero buoyancy pressure). It has one or more containers and is located below a seal.
* A '''transition zone''' is the interval of rock separating the reservoir from the aquifer; it is less than 100% saturated with water.
* An '''aquifer''' is a porous and permeable rock 100% saturated with water. It has one or more containers that may or may not be shared with a reservoir.
The diagram below illustrates the major components of a conventional reservoir system.
[[file:predicting-reservoir-system-quality-and-performance_fig9-1.png|thumb|{{figure number|9-1}}See text for explanation.]]
==Waste and transition zones==
A '''waste zone''' may be found at the top of a reservoir, just below the seal, if there is a decrease in the size of the pore throat radii of the reservoir. It generally produces hydrocarbon and water on a production test (Showalter, 1979).
A '''transition zone''' is located at the base of a reservoir and forms as a result of a loss of buoyancy pressure in the hydrocarbon phase. Pore throat diameter and fluid densities determine its thickness. It generally produces hydrocarbon and water on a production test.
==Free water level==
The '''free water level''' is located at the base of a hydrocarbon column and the transition zone. Above this level, the reservoir produces water alone, hydrocarbon and water, or hydrocarbon alone on a production test. Below this level lies the aquifer of a water-drive reservoir system. It produces water only. Zero buoyancy pressure exists at this level or below.
==See also==
* [[Reservoir system basics]]
* [[Analyzing a reservoir system]]
* [[Defining flow units and containers]]
* [[Reservoir drive mechanisms]]
* [[Predicting reservoir drive mechanism]]
==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch09/ch09.htm Original content in Datapages]
* [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store]
[[Category:Predicting the occurrence of oil and gas traps]]
[[Category:Predicting reservoir system quality and performance]]
| image = exploring-for-oil-and-gas-traps.png
| width = 120px
| series = Treatise in Petroleum Geology
| title = Exploring for Oil and Gas Traps
| part = Predicting the occurrence of oil and gas traps
| chapter = Predicting reservoir system quality and performance
| frompg = 9-1
| topg = 9-156
| author = Dan J. Hartmann, Edward A. Beaumont
| link = http://archives.datapages.com/data/specpubs/beaumont/ch09/ch09.htm
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
The term “reservoir” creates confusion between different disciplines. Explorationists apply the term to mean a porous and permeable rock regardless of the fluid it contains. Reservoir engineers apply the term to mean a rock that contains hydrocarbons and associated fluids. This difference in meanings can cause problems for multidisciplinary teams unless the terminology is clear.
==Reservoir system components==
In this discussion, a reservoir system is a water–hydrocarbon system contained within the pores of a rock unit. A reservoir system has three main components: a reservoir, an aquifer, and a transition zone (interface) between the two.
* A '''reservoir''' is a porous and permeable rock saturated with oil or gas in [[buoyancy pressure]] equilibrium with a free water level (zero buoyancy pressure). It has one or more containers and is located below a seal.
* A '''transition zone''' is the interval of rock separating the reservoir from the aquifer; it is less than 100% saturated with water.
* An '''aquifer''' is a porous and permeable rock 100% saturated with water. It has one or more containers that may or may not be shared with a reservoir.
The diagram below illustrates the major components of a conventional reservoir system.
[[file:predicting-reservoir-system-quality-and-performance_fig9-1.png|thumb|{{figure number|9-1}}See text for explanation.]]
==Waste and transition zones==
A '''waste zone''' may be found at the top of a reservoir, just below the seal, if there is a decrease in the size of the pore throat radii of the reservoir. It generally produces hydrocarbon and water on a production test (Showalter, 1979).
A '''transition zone''' is located at the base of a reservoir and forms as a result of a loss of buoyancy pressure in the hydrocarbon phase. Pore throat diameter and fluid densities determine its thickness. It generally produces hydrocarbon and water on a production test.
==Free water level==
The '''free water level''' is located at the base of a hydrocarbon column and the transition zone. Above this level, the reservoir produces water alone, hydrocarbon and water, or hydrocarbon alone on a production test. Below this level lies the aquifer of a water-drive reservoir system. It produces water only. Zero buoyancy pressure exists at this level or below.
==See also==
* [[Reservoir system basics]]
* [[Analyzing a reservoir system]]
* [[Defining flow units and containers]]
* [[Reservoir drive mechanisms]]
* [[Predicting reservoir drive mechanism]]
==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch09/ch09.htm Original content in Datapages]
* [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store]
[[Category:Predicting the occurrence of oil and gas traps]]
[[Category:Predicting reservoir system quality and performance]]