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  | isbn    = 0891816607
 
  | isbn    = 0891816607
 
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Stratigraphically complex fields are those that exhibit a high degree of vertical and lateral heterogeneity that is directly controlled by the environment of deposition (Table 1). This heterogeneity occurs at all scales (see [[Geological heterogeneities]]). It can result in a highly variable distribution of rock properties within one reservoir and the division of a single stratigraphic interval into multiple reservoirs that act as independent, self-contained compartments.
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Stratigraphically complex fields are those that exhibit a high degree of vertical and [[lateral]] heterogeneity that is directly controlled by the environment of deposition (Table 1). This heterogeneity occurs at all scales (see [[Geological heterogeneities]]). It can result in a highly variable distribution of rock properties within one reservoir and the division of a single stratigraphic interval into multiple reservoirs that act as independent, self-contained compartments.
    
==Degree of hetrogeneity==
 
==Degree of hetrogeneity==
 
{| class = "wikitable"
 
{| class = "wikitable"
 
|-
 
|-
|+ {{table number|1}}Tentative, relative depositional heterogeneity ranking of reservoir facies based primarily on Texas petroleum fields
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|+ {{table number|1}}Tentative, relative depositional heterogeneity ranking of reservoir facies based primarily on Texas [[petroleum]] fields
 
|-
 
|-
 
! Depositional Environment
 
! Depositional Environment
 
! Heterogeneity Rank
 
! Heterogeneity Rank
 
|-
 
|-
| ''' Siliciclastic Systems '''
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| colspan=2 | ''' Siliciclastic Systems '''
|
  −
 
   
|-
 
|-
 
|   Submarine slope/fan/canyon fill, silty to muddy
 
|   Submarine slope/fan/canyon fill, silty to muddy
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| 8.0
 
| 8.0
 
|-
 
|-
|   Fluvial or deltaic sandstone on carbonate shelf
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|   Fluvial or deltaic [[sandstone]] on carbonate shelf
 
| 8.0
 
| 8.0
 
|-
 
|-
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| 2.0
 
| 2.0
 
|-
 
|-
| ''' Carbonate Systems '''
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| colspan=2 | ''' Carbonate Systems '''
|
  −
 
   
|-
 
|-
 
|   Evaporitic flats (sabkhas)
 
|   Evaporitic flats (sabkhas)
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| 8.5
 
| 8.5
 
|-
 
|-
|   Open shelves, extensive diagenesis
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|   Open shelves, extensive [[diagenesis]]
 
| 8.0
 
| 8.0
 
|-
 
|-
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| 8.0
 
| 8.0
 
|-
 
|-
|   Karstic unconformity zones
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|   Karstic [[unconformity]] zones
 
| 8.0
 
| 8.0
 
|-
 
|-
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* Questionable correlation of depositional packages between wells
 
* Questionable correlation of depositional packages between wells
 
* Presence of numerous vertical [[permeability]] barriers at a variety of scales
 
* Presence of numerous vertical [[permeability]] barriers at a variety of scales
* Complex [[porosity]]-permeability and [[capillary pressure]] relationships (a broad scatter in the data indicates different lithofacies and pore types)
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* Complex [[porosity]]-permeability and [[capillary pressure]] relationships (a broad scatter in the data indicates different [[lithofacies]] and pore types)
 
* Anomalous changes in pressure gradient
 
* Anomalous changes in pressure gradient
 
* Variable oil and water chemical composition
 
* Variable oil and water chemical composition
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[[Category:Geological methods]]
 
[[Category:Geological methods]]
 +
[[Category:Methods in Exploration 10]]

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