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Iraq petroleum geology (view source)

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The major reservoirs in Iraq are Cretaceous, and these are the main reservoirs in 69 discoveries. The recoverable reserves in Cretaceous reservoirs in all fields are estimated to be between 59 and 101 gbo and 15 to 55 tcfg. Similar, there are 32 discoveries with mainly Cenozoic reservoirs, with 24–46 gbo and 14–41 tcfg recoverable in all Cenozoic reservoirs. Only 10 discoveries are mainly in Triassic reservoirs, with recoverable reserves of 400–500 mbo and up to 6 tcfg, and three discoveries mainly from Jurassic reservoirs, with 580–1500 mbo and no gas. Estimates of up to 6 tcfg of gas occur in the Paleozoic at Akkas field, with shows in Khleisia 1.
 
The major reservoirs in Iraq are Cretaceous, and these are the main reservoirs in 69 discoveries. The recoverable reserves in Cretaceous reservoirs in all fields are estimated to be between 59 and 101 gbo and 15 to 55 tcfg. Similar, there are 32 discoveries with mainly Cenozoic reservoirs, with 24–46 gbo and 14–41 tcfg recoverable in all Cenozoic reservoirs. Only 10 discoveries are mainly in Triassic reservoirs, with recoverable reserves of 400–500 mbo and up to 6 tcfg, and three discoveries mainly from Jurassic reservoirs, with 580–1500 mbo and no gas. Estimates of up to 6 tcfg of gas occur in the Paleozoic at Akkas field, with shows in Khleisia 1.
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|+ {{table number|5}}List of reservoir name, age, and strata type, and seal name and strata type, for wells with reported oil and/or gas shows.  Comment field indicates where informatio comes from. Field number refers to locations shown in [[:file:M106Ch12Fig03.jpg|Figure 3]].
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! Age Sort || Show # || Show Structure || Reservoir Name || Reservoir Age || Reservoir Strata Type || Seal Name || Seal Strata Type || Comments
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|-
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| 10 || 5 || Abtakh || Fatha || Miocene || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 12 || 5 || Abtakh || Jeribe || Miocene || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 40 || 5 || Abtakh || Shiranish/Hartha || Late Cretaceous || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 42 || 5 || Abtakh || Mushorah || Late Cretaceous || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 64 || 5 || Abtakh || Mus || Early Jurassic || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 68 || 5 || Abtakh || Butmah || Early Jurassic-Late Triassic || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 70 || 5 || Abtakh || Kurra Chine || Late Triassic || Carboante ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 75 || 5 || Abtakh || Geli Khana || Middle Triassic || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 22 || 69 || Abu Jir || Kirkuk Group || Oligocene || Carbonate || Euphrates || Argillaceous limestone || 
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|-
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| 50 || 115 || Abu Kheima || Ratawi || Early Cretaceous || Carbonate || Ratawi || Shale || 
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|-
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| 51 || 115 || Abu Kheima || Yamama || Early Cretaceous || Carbonate || Ratawi || Shale || 
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|-
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| 55 || 115 || Abu Kheima || Gotnia || Late Jurassic || Carbonate || Chia Gara || Argillaceous limestone || 
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|-
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| 58 || 115 || Abu Kheima || Najmah || Late-Middle Jurassic || Carbonate || Gotnia || Evaporite || 
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|-
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| 68 || 18 || Adaiyah || Butmah/Kurra Chine || Early Jurassic\Late Triassic || Carbonate || Butmah || Shale || 
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|-
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| 20 || 73 || Afaq || Jeribe/Euphrates || Miocene || Carbonate || Fatha || Marl || 
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|-
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| 41 || 73 || Afaq || Hartha || Late Cretaceous || Carbonate || Upper Hartha || Argillaceous limestone || 
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|-
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| 45 || 73 || Afaq || Ahmadi || Late Cretaceous || Carbonate || Ahmadi || Shale || 
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|-
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| 46 || 73 || Afaq || Mauddud || Early Cretaceous || Carbonate || Mauddud || Argillaceous limestone || 
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|-
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| 12 || 14 || Ain Ghazal || Jeribe || Miocene || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 20 || 14 || Ain Ghazal || Euphrates || Oligocene || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 60 || 12 || Alan || Sargelu || Middle Jurassic || Carbonate || Sarmord || Marl || 
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|-
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| 70 || 12 || Alan || Kurra Chine || Late Triassic || Carbonate || Kurra Chine || Evaporite-Marl || 
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|-
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| 42 || 50 || Anah || Mushorah || Late Cretaceous || Carbonate ||  ||  || 
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|-
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| 68 || 50 || Anah || Alan/Mus/Adaiyah/Butmah || Early Jurassic-Late Triassic || Carbonate || Alan || Evaporite || 
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|-
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| 65 || 17 || Atshan || Adaiyah || Early Jurassic || Carbonate || Adaiyah || Evaporite || 
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|-
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| 70 || 17 || Atshan || Kurra Chine/Geli Khana || Late-Middle Triassic || Carbonate || Baluti || Shale || 
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|-
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| 47 || 68 || Awasil || Nahr Umr || Early Cretaceous || Sandstone || Mauddud || Shale || 
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|-
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| 55 || 68 || Awasil || Gotnia || Late Jurassic || Carbonate || Sarmord || Shale ||   
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|-
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| 41 || 65 || Fallujah || Hartha || Late Cretaceous || Carbonate || Shiranish || Marl || 
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|-
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| 44 || 65 || Fallujah || Maotsi || Late Cretaceous || Carbonate || Maotsi || Evaporite-Marl || 
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|-
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| 55 || 65 || Fallujah || Najmah || Late Jurassic || Carbonate || Gotnia || Evaporite || 
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|-
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| 47 || 94 || Ghalaisan || Nahr Umr || Early Cretaceous || Sandstone || Upper Nahr Umr || Shale || 
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|-
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| 8 || 54 || Gilabat || Injana || Miocene || Sandstone || Injana || Shale || 
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|-
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| 10 || 54 || Gilabat || Fatha || Miocene || Carbonate || Fatha || Evaporite-Marl || 
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|-
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| 12 || 7 || Gullar || Jeribe || Miocene || Carbonate || Fatha || Evaporite-Marl || 
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|-
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| 42 || 7 || Gullar || Mushorah || Late Cretaceous || Carbonate || Shiranish || Marl || 
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|-
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| 15 || 24 || Hibbarah || Jeribe/Euphrates || Miocene-Oligocene || Carbonate || Fatha || Evaporite-Marl || 
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|-
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| 41 || 24 || Hibbarah || Hartha || Late Cretaceous || Carbonate || Shiranish || Argillaceous limestone || 
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|-
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| 46 || 24 || Hibbarah || Jawan || Early Cretaceous || Carbonate || Jawan || Evaporite-Marl || 
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|-
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| 22 || 67 || Hit || Euphrates/Kirkuk Group || Oligocene || Carbonate || Fatha || Evaporite-Marl || 
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|-
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| 41 || 67 || Hit || Hartha || Late Cretaceous || Carbonate || Shiranish || Marl || 
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|-
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| 70 || 16 || Ibrahim || Kurra Chine || Late Triassic || Carbonate || Kurra Chine || Argillaceous limestone || 
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|-
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|m 40 || 9 || Jabal Kand || Shiranish || Late Cretaceous || Carbonate || Aaliji || Shale || 
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|-
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| 40 || 104 || Jabel Sanam || Ahmadi || Late Cretaceous || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 44 || 104 || Jabel Sanam || Mishrif || Late Cretaceous || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 47 || 104 || Jabel Sanam || Nahr Umr || Early Cretaceous || Sandstone ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 49 || 104 || Jabel Sanam || Zubair || Early Cretaceous || Sandstone ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 43 || 113 || Jerishan || Khasib || Late Cretaceous || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 44 || 113 || Jerishan || Mishrif || Late Cretaceous || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 46 || 113 || Jerishan || Mauddud || Early Cretaceous || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 47 || 113 || Jerishan || Nahr Umr || Early Cretaceous || Sandstone ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 48 || 113 || Jerishan || Shuaibia || Early Cretaceous || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 50 || 113 || Jerishan || Ratawi/Yamama || Early Cretaceous || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 52 || 113 || Jerishan || Sulaiy || Early Cretaceous || Carbonate ||  ||  || Jassim and Goff<ref name=Jassimandgoff_2006 />
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|-
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| 45 || 114 || Khidr Al Maa || Mishrif || Late Cretaceous || Carbonate || Khasib || Argillaceous limestone || 
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|-
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| 47 || 114 || Khidr Al Maa || Nahr Umr || Early Cretaceous || Sandstone || Upper Nahr Umr || Shale || 
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|-
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| 49 || 114 || Khidr Al Maa || Zubair || Early Cretaceous || Sandstone || Upper Shale Member || Shale || 
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|-
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| 51 || 114 ||
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|}
    
Several conclusions can be drawn from these data:
 
Several conclusions can be drawn from these data:
Retrieved from "https://wiki.aapg.org/Special:MobileDiff/24741"

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