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| | isbn = 0891816607 | | | isbn = 0891816607 |
| }} | | }} |
− | 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. | + | 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 | + | |+ {{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 ''' | + | | 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 | + | | Fluvial or deltaic [[sandstone]] on carbonate shelf |
| | 8.0 | | | 8.0 |
| |- | | |- |
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| | 2.0 | | | 2.0 |
| |- | | |- |
− | | ''' Carbonate Systems ''' | + | | colspan=2 | ''' Carbonate Systems ''' |
− | |
| |
− | | |
| |- | | |- |
| | Evaporitic flats (sabkhas) | | | Evaporitic flats (sabkhas) |
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| | 8.5 | | | 8.5 |
| |- | | |- |
− | | Open shelves, extensive diagenesis | + | | Open shelves, extensive [[diagenesis]] |
| | 8.0 | | | 8.0 |
| |- | | |- |
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| | 8.0 | | | 8.0 |
| |- | | |- |
− | | Karstic unconformity zones | + | | 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) | + | * 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]] |