Arab-D carbonate formation
E777207
The Arab-D carbonate formation is a highly productive Late Jurassic limestone and dolomite reservoir rock that hosts much of the oil in Saudi Arabia’s giant Ghawar field and other major Middle Eastern petroleum accumulations.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Arab carbonate-evaporite sequence | 1 |
| Arab-D carbonate formation canonical | 1 |
| Arab-D carbonate reservoir | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9106344 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Arab-D carbonate formation Context triple: [Ghawar oil field, reservoirFormation, Arab-D carbonate formation]
-
A.
Magnesian Limestone succession
The Magnesian Limestone succession is a geological sequence of Permian-age dolomitic limestone formations that forms a distinctive belt across parts of northern and central England.
-
B.
Lomagundi–Jatuli carbon isotope excursion
The Lomagundi–Jatuli carbon isotope excursion was a major global perturbation in the carbon cycle during the Paleoproterozoic, marked by unusually high carbon isotope ratios that suggest prolonged burial of organic carbon and significant changes in Earth’s atmosphere and oceans.
-
C.
Kellwasser horizons
The Kellwasser horizons are distinctive black shale layers in Late Devonian marine sediments that mark one of the major extinction pulses during the Late Devonian mass extinction.
-
D.
Bowen’s reaction series
Bowen’s reaction series is a conceptual model in geology that explains the sequence and conditions under which minerals crystallize from cooling magma.
-
E.
Elements of Petroleum Geology
Elements of Petroleum Geology is a widely used textbook that provides a comprehensive introduction to the geological principles and methods involved in the exploration and production of petroleum.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Arab-D carbonate formation Target entity description: The Arab-D carbonate formation is a highly productive Late Jurassic limestone and dolomite reservoir rock that hosts much of the oil in Saudi Arabia’s giant Ghawar field and other major Middle Eastern petroleum accumulations.
-
A.
Magnesian Limestone succession
The Magnesian Limestone succession is a geological sequence of Permian-age dolomitic limestone formations that forms a distinctive belt across parts of northern and central England.
-
B.
Lomagundi–Jatuli carbon isotope excursion
The Lomagundi–Jatuli carbon isotope excursion was a major global perturbation in the carbon cycle during the Paleoproterozoic, marked by unusually high carbon isotope ratios that suggest prolonged burial of organic carbon and significant changes in Earth’s atmosphere and oceans.
-
C.
Kellwasser horizons
The Kellwasser horizons are distinctive black shale layers in Late Devonian marine sediments that mark one of the major extinction pulses during the Late Devonian mass extinction.
-
D.
Bowen’s reaction series
Bowen’s reaction series is a conceptual model in geology that explains the sequence and conditions under which minerals crystallize from cooling magma.
-
E.
Elements of Petroleum Geology
Elements of Petroleum Geology is a widely used textbook that provides a comprehensive introduction to the geological principles and methods involved in the exploration and production of petroleum.
- F. None of above. chosen
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
carbonate reservoir rock
ⓘ
geologic formation ⓘ petroleum reservoir ⓘ |
| depositionalEnvironment |
shallow-marine carbonate platform
ⓘ
shoal and grainstone complexes ⓘ |
| diageneticFeatures |
cementation
ⓘ
dissolution-enhanced porosity ⓘ dolomitization ⓘ |
| discoveryContext | developed as a major reservoir during mid-20th century exploration in Saudi Arabia ⓘ |
| economicImportance |
hosts much of the oil in the Ghawar field
ⓘ
one of the most productive oil reservoirs in the world ⓘ |
| geologicAge | Late Jurassic ⓘ |
| geologicPeriod | Jurassic ⓘ |
| hydrocarbonSystemRole | principal reservoir in the Jurassic petroleum system of eastern Saudi Arabia ⓘ |
| hydrocarbonType | light crude oil ⓘ |
| lithology |
dolomite
ⓘ
limestone ⓘ |
| locatedIn |
Arabian Basin
ⓘ
Middle East ⓘ Saudi Arabia ⓘ |
| memberOf |
Arab carbonate-evaporite sequence
ⓘ
linked to:
Arab-D carbonate formation
|
| namingConvention | designated as the D member of the Arab Formation ⓘ |
| operatorAssociation | Saudi Aramco ⓘ |
| overlainBy | Arab evaporite units ⓘ |
| partOf | Arab Formation ⓘ |
| permeabilityCharacteristic | high permeability in grainstone and dolomitized intervals ⓘ |
| porosityType |
fracture porosity
ⓘ
intergranular porosity ⓘ vuggy porosity ⓘ |
| primaryProductionMechanism | solution-gas drive and waterflooding in Ghawar field ⓘ |
| regionalCorrelation | equivalent to other Late Jurassic Arab reservoirs across the Arabian Plate ⓘ |
| reservoirFor |
associated gas
ⓘ
conventional oil ⓘ |
| sealRock | overlying anhydrite and evaporites of the Arab Formation ⓘ |
| stratigraphicPosition | upper part of the Jurassic succession in eastern Saudi Arabia ⓘ |
| stratigraphicUnitOf |
Abqaiq oil field
ⓘ
Ghawar oil field ⓘ Shaybah oil field ⓘ other major Middle Eastern petroleum accumulations ⓘ |
| structuralSetting | gentle regional anticlines of the Ghawar trend ⓘ |
| thicknessCharacteristic | substantial net pay thickness in Ghawar field ⓘ |
| underlainBy | Hanifa Formation ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Arab-D carbonate formation Description of subject: The Arab-D carbonate formation is a highly productive Late Jurassic limestone and dolomite reservoir rock that hosts much of the oil in Saudi Arabia’s giant Ghawar field and other major Middle Eastern petroleum accumulations.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Arab-D carbonate formation
linked to: Arab-D carbonate formation