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Reservoir system quality prediction (view source)
Revision as of 20:57, 31 January 2014
, 20:57, 31 January 2014Initial 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 interrelationship of reservoir [[porosity]], [[permeability]], thickness, and lateral distribution determines reservoir system quality. Although quality prediction is most effective with large amounts of superior data, useful predictions can still be made from very limited data. This section discusses methods for predicting the quality of sandstone and carbonate reservoir systems.
==Sandstones vs. carbonates==
Sandstones and carbonates are the dominant reservoir rocks. Although quite similar, they are different. The table below (after <ref name=ch09r10>Choquette, P., W., Pray, L., C., 1970, Geologic nomenclature and classification of porosity in sedimentary carbonates: AAPG Bulletin, vol. 54, no. 2, p. 207–250. Classic reference for basic concepts regarding carbonate porosity.</ref> compares variables affecting reservoir system quality for sandstones vs. carbonates.
{| class = "wikitable"
|-
! Variable
! Sandstones
! Carbonates
|-
| Sediment composition
| High variability (depending on provenance and depositional environment)
| Low variability [variations of CaCO<sub>3</sub> and MgCa(CO<sub>3</sub> )<sub>2</sub> ]
|-
| Cement mineralogy
| Quartz, calcite, dolomite, clay, and anhydrite, etc.
| Aragonite, high- and low-Mg calcite, dolomite
|-
| Original pore geometry
| Intergranular
| Intergranular predominates, but intragranular is important
|-
| Ultimate pore geometry
| Intergranular = intercrystalline > moldic
| Intergranular = intercrystalline = moldic > microporosity
|-
| Uniformity of pore size, shape, and distribution
| Fairly uniform within a facies
| Ranges from fairly uniform to extremely heterogeneous, even within a facies
|-
| Influence of diagenesis
| Minor to major
| Usually major
|}
==See also==
* [[Predicting sandstone porosity and permeability]]
* [[Predicting carbonate porosity and permeability]]
==References==
{{reflist}}
==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 interrelationship of reservoir [[porosity]], [[permeability]], thickness, and lateral distribution determines reservoir system quality. Although quality prediction is most effective with large amounts of superior data, useful predictions can still be made from very limited data. This section discusses methods for predicting the quality of sandstone and carbonate reservoir systems.
==Sandstones vs. carbonates==
Sandstones and carbonates are the dominant reservoir rocks. Although quite similar, they are different. The table below (after <ref name=ch09r10>Choquette, P., W., Pray, L., C., 1970, Geologic nomenclature and classification of porosity in sedimentary carbonates: AAPG Bulletin, vol. 54, no. 2, p. 207–250. Classic reference for basic concepts regarding carbonate porosity.</ref> compares variables affecting reservoir system quality for sandstones vs. carbonates.
{| class = "wikitable"
|-
! Variable
! Sandstones
! Carbonates
|-
| Sediment composition
| High variability (depending on provenance and depositional environment)
| Low variability [variations of CaCO<sub>3</sub> and MgCa(CO<sub>3</sub> )<sub>2</sub> ]
|-
| Cement mineralogy
| Quartz, calcite, dolomite, clay, and anhydrite, etc.
| Aragonite, high- and low-Mg calcite, dolomite
|-
| Original pore geometry
| Intergranular
| Intergranular predominates, but intragranular is important
|-
| Ultimate pore geometry
| Intergranular = intercrystalline > moldic
| Intergranular = intercrystalline = moldic > microporosity
|-
| Uniformity of pore size, shape, and distribution
| Fairly uniform within a facies
| Ranges from fairly uniform to extremely heterogeneous, even within a facies
|-
| Influence of diagenesis
| Minor to major
| Usually major
|}
==See also==
* [[Predicting sandstone porosity and permeability]]
* [[Predicting carbonate porosity and permeability]]
==References==
{{reflist}}
==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]]