Carbonate reservoir characteristics and porosity distribution in Souedih Oilfield, northeast Syria

Amer Ghabra, Dominic Tatum, Andrew Richard Gardiner, Dorrik Stow

    Research output: Contribution to journalArticle

    Abstract

    The Souedih (also spelled Suwaidiyah) Oilfield is located in the extreme northeast of Syria in part of the Mesopotamian Basin. The principal reservoir of most fields in this region is the Upper Cretaceous, carbonate-rich Massive Formation. Using data from 25 wells and 36 samples/thin sections, this study focuses on the nature and distribution of porosity in the main Souedih reservoir. The Massive A reservoir is 100–120 m thick and represented by uniform, ioturbated bioclastic packstone and bioclastic packstonegrainstone, deposited in a well-oxygenated, moderate to high-energy, shallow-marine environment. It is generally well cemented by microsparite and micrite, and more rarely by sparite. Porosity is highly variable, ranging from < 1% to 20%. Mouldic porosity is the most common type, with rare channel and fracture porosity. Average porosity values tend to decrease eastward across the reservoir, which can also be divided vertically into five zones. The uppermost of these shows the highest average porosity > 15%. The dominance of mouldic porosity throughout the study area indicates that secondary dissolution was the primary cause and that pre-existing bioclasts were the principal targets for this dissolution. The source of these diagenetic fluids is still unclear, although our data do lend some support to the
    karstification theory. These characteristics are important for understanding and managing reservoir production, not only for Souedih but for the region in general.
    Original languageEnglish
    Pages (from-to)177-192
    Number of pages16
    JournalGeoArabia
    Volume19
    Issue number2
    Publication statusPublished - 2014

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    porosity
    carbonate
    dissolution
    micrite
    thin section
    marine environment
    Cretaceous
    well
    fluid
    distribution
    basin
    energy

    Cite this

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    title = "Carbonate reservoir characteristics and porosity distribution in Souedih Oilfield, northeast Syria",
    abstract = "The Souedih (also spelled Suwaidiyah) Oilfield is located in the extreme northeast of Syria in part of the Mesopotamian Basin. The principal reservoir of most fields in this region is the Upper Cretaceous, carbonate-rich Massive Formation. Using data from 25 wells and 36 samples/thin sections, this study focuses on the nature and distribution of porosity in the main Souedih reservoir. The Massive A reservoir is 100–120 m thick and represented by uniform, ioturbated bioclastic packstone and bioclastic packstonegrainstone, deposited in a well-oxygenated, moderate to high-energy, shallow-marine environment. It is generally well cemented by microsparite and micrite, and more rarely by sparite. Porosity is highly variable, ranging from < 1{\%} to 20{\%}. Mouldic porosity is the most common type, with rare channel and fracture porosity. Average porosity values tend to decrease eastward across the reservoir, which can also be divided vertically into five zones. The uppermost of these shows the highest average porosity > 15{\%}. The dominance of mouldic porosity throughout the study area indicates that secondary dissolution was the primary cause and that pre-existing bioclasts were the principal targets for this dissolution. The source of these diagenetic fluids is still unclear, although our data do lend some support to thekarstification theory. These characteristics are important for understanding and managing reservoir production, not only for Souedih but for the region in general.",
    author = "Amer Ghabra and Dominic Tatum and Gardiner, {Andrew Richard} and Dorrik Stow",
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    language = "English",
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    }

    Carbonate reservoir characteristics and porosity distribution in Souedih Oilfield, northeast Syria. / Ghabra, Amer; Tatum, Dominic; Gardiner, Andrew Richard; Stow, Dorrik.

    In: GeoArabia, Vol. 19, No. 2, 2014, p. 177-192.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Carbonate reservoir characteristics and porosity distribution in Souedih Oilfield, northeast Syria

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    AU - Tatum, Dominic

    AU - Gardiner, Andrew Richard

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    Y1 - 2014

    N2 - The Souedih (also spelled Suwaidiyah) Oilfield is located in the extreme northeast of Syria in part of the Mesopotamian Basin. The principal reservoir of most fields in this region is the Upper Cretaceous, carbonate-rich Massive Formation. Using data from 25 wells and 36 samples/thin sections, this study focuses on the nature and distribution of porosity in the main Souedih reservoir. The Massive A reservoir is 100–120 m thick and represented by uniform, ioturbated bioclastic packstone and bioclastic packstonegrainstone, deposited in a well-oxygenated, moderate to high-energy, shallow-marine environment. It is generally well cemented by microsparite and micrite, and more rarely by sparite. Porosity is highly variable, ranging from < 1% to 20%. Mouldic porosity is the most common type, with rare channel and fracture porosity. Average porosity values tend to decrease eastward across the reservoir, which can also be divided vertically into five zones. The uppermost of these shows the highest average porosity > 15%. The dominance of mouldic porosity throughout the study area indicates that secondary dissolution was the primary cause and that pre-existing bioclasts were the principal targets for this dissolution. The source of these diagenetic fluids is still unclear, although our data do lend some support to thekarstification theory. These characteristics are important for understanding and managing reservoir production, not only for Souedih but for the region in general.

    AB - The Souedih (also spelled Suwaidiyah) Oilfield is located in the extreme northeast of Syria in part of the Mesopotamian Basin. The principal reservoir of most fields in this region is the Upper Cretaceous, carbonate-rich Massive Formation. Using data from 25 wells and 36 samples/thin sections, this study focuses on the nature and distribution of porosity in the main Souedih reservoir. The Massive A reservoir is 100–120 m thick and represented by uniform, ioturbated bioclastic packstone and bioclastic packstonegrainstone, deposited in a well-oxygenated, moderate to high-energy, shallow-marine environment. It is generally well cemented by microsparite and micrite, and more rarely by sparite. Porosity is highly variable, ranging from < 1% to 20%. Mouldic porosity is the most common type, with rare channel and fracture porosity. Average porosity values tend to decrease eastward across the reservoir, which can also be divided vertically into five zones. The uppermost of these shows the highest average porosity > 15%. The dominance of mouldic porosity throughout the study area indicates that secondary dissolution was the primary cause and that pre-existing bioclasts were the principal targets for this dissolution. The source of these diagenetic fluids is still unclear, although our data do lend some support to thekarstification theory. These characteristics are important for understanding and managing reservoir production, not only for Souedih but for the region in general.

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