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Morad, Sadoon
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Publications (10 of 21) Show all publications
Vieira, M. M., Sial, A. N., De Ros, L. F. & Morad, S. (2017). Origin of holocene beachrock cements in northeastern Brazil: Evidence from carbon and oxygen isotopes. Journal of South American Earth Sciences, 79, 401-408
Open this publication in new window or tab >>Origin of holocene beachrock cements in northeastern Brazil: Evidence from carbon and oxygen isotopes
2017 (English)In: Journal of South American Earth Sciences, ISSN 0895-9811, E-ISSN 1873-0647, Vol. 79, p. 401-408Article in journal (Refereed) Published
Abstract [en]

This study has utilized carbon and oxygen isotopic data to unravel the origin of Holocene beachrock cements of Rio Grande do Norte State coast, northeastern Brazil. The cements are exclusively constituted of Mg-calcite, with isopachous prismatic rim, equant spar, cryptocrystalline coating or pore-filling, pseudo-peloidal, radial and scalenohedral habits. The delta O-18(VPDB) values of most (93%) of the samples range from -1.8 parts per thousand to +0.5 parts per thousand, which are compatible with precipitation from marine waters. The delta C-13(VPDB) values of these cements are +1.7 to +3.6 parts per thousand (average + 3.05 parts per thousand) suggesting derivation from marine dissolved carbon. In a few cases, the Mg-calcite cement shows low delta C-13(VPDB) (-7.3% o and -7.8 parts per thousand) and delta O-18(VPDB) (-4.4 parts per thousand and -4.3) values, which may indicate precipitation or recrystallization of marine cements under the influence of meteoric waters.

Keywords
Beachrock, Stable isotopes, Mg-calcite cement, Marine water
National Category
Geology
Identifiers
urn:nbn:se:uu:diva-341651 (URN)10.1016/j.jsames.2017.09.002 (DOI)000414619400028 ()
Available from: 2018-02-16 Created: 2018-02-16 Last updated: 2018-02-16Bibliographically approved
Fontana, S., Nader, F. H., Morad, S., Ceriani, A., Al-Aasm, I. S., Daniel, J.-M. & Mengus, J.-M. (2014). Fluid-rock interactions associated with regional tectonics and basin evolution. Sedimentology, 61(3), 660-690
Open this publication in new window or tab >>Fluid-rock interactions associated with regional tectonics and basin evolution
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2014 (English)In: Sedimentology, ISSN 0037-0746, E-ISSN 1365-3091, Vol. 61, no 3, p. 660-690Article, review/survey (Refereed) Published
Abstract [en]

An integrated approach consisting of fracture analysis, petrography, carbon, oxygen and strontium-isotope analyses, as well as fluid-inclusion micro-thermometry, led to a better understanding of the evolution of fluid-rock interactions and diagenesis of the Upper Permian to Upper Triassic carbonates of the United Arab Emirates. The deposited carbonates were first marked by extensive early dolomitization. During progressive burial, the carbonates were affected by dolomite recrystallization as well as precipitation of vug and fracture-filling dolomite, quartz and calcite cements. After considerable burial during the Middle Cretaceous, sub-vertical north-south oriented fractures (F1) were cemented by dolomite derived from mesosaline to hypersaline fluids. Upon the Late Cretaceous maximum burial and ophiolite obduction, sub-vertical east-west fractures (F2) were cemented by dolomite (Dc2) and saddle dolomite (Ds) derived from hot, highly saline fluids. Then, minor quartz cement has precipitated in fractures from hydrothermal brines. Fluid-inclusion analyses of the various diagenetic phases imply the involvement of increasingly hot (200 degrees C) saline brines (20 to 23% NaCl eq.). Through one-dimensional burial history numerical modelling, the maximum temperatures reached by the studied rocks are estimated to be in the range of 160 to 200 degrees C. Tectonically-driven flux of hot fluids and associated diagenetic products are interpreted to have initiated during the Late Cretaceous maximum burial and lasted until the Oligocene-Miocene compressional tectonics and related uplift. The circulation of such hydrothermal brines led to partial dissolution of dolomites (Dc2 and Ds) and to precipitation of hydrothermal calcite C1 in new (mainly oriented north-south; F3) and pre-existing, reactivated fractures. The integration of the obtained data confirms that the diagenetic evolution was controlled primarily by the interplay of the burial thermal evolution of the basin and the regional tectonic history. Hence, this contribution highlights the impacts of regional tectonics and basin history on diagenetic processes, which may subsequently affect reservoir properties.

Keywords
dolomitization, United Arab Emirates, Carbonates, Permo-Triassic, fluid evolution, diagenesis
National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-223435 (URN)10.1111/sed.12073 (DOI)000332777300003 ()
Available from: 2014-04-21 Created: 2014-04-18 Last updated: 2017-12-05Bibliographically approved
Mansurbeg, H., Morad, S., Plink-Björklund, P., El-Ghali, M. A., Caja, M. & Marfil, R. (2013). Diagenetic Alterations Related to Falling Stage and Lowstand Systems Tracts of Shelf, Slope and Basin Floor Sandstones (Eocene Central Basin, Spitsbergen). In: Sadoon Morad, J. Marcelo Ketzer, Luiz F. De Ros (Ed.), Linking Diagenesis to Sequence Stratigraphy: (pp. 353-378). John Wiley & Sons
Open this publication in new window or tab >>Diagenetic Alterations Related to Falling Stage and Lowstand Systems Tracts of Shelf, Slope and Basin Floor Sandstones (Eocene Central Basin, Spitsbergen)
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2013 (English)In: Linking Diagenesis to Sequence Stratigraphy / [ed] Sadoon Morad, J. Marcelo Ketzer, Luiz F. De Ros, John Wiley & Sons, 2013, p. 353-378Chapter in book (Refereed)
Place, publisher, year, edition, pages
John Wiley & Sons, 2013
National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-95538 (URN)10.1002/9781118485347.ch15 (DOI)9781118485392 (ISBN)9781118485347 (ISBN)
Available from: 2007-03-01 Created: 2007-03-01 Last updated: 2013-07-10Bibliographically approved
El-Ghali, M. A., El Khoriby, E., Mansurbeg, H., Morad, S. & Ogle, N. (2013). Distribution of carbonate cements within depositional facies and sequence stratigraphic framework of shoreface and deltaic arenites, Lower Miocene, the Gulf of Suez rift, Egypt. Marine and Petroleum Geology, 45, 267-280
Open this publication in new window or tab >>Distribution of carbonate cements within depositional facies and sequence stratigraphic framework of shoreface and deltaic arenites, Lower Miocene, the Gulf of Suez rift, Egypt
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2013 (English)In: Marine and Petroleum Geology, ISSN 0264-8172, E-ISSN 1873-4073, Vol. 45, p. 267-280Article in journal (Refereed) Published
Abstract [en]

This study aims to unravel the spatial and temporal distribution of diagenetic alterations of the Mheiherrat Member, the Rudeis Formation (lower Miocene) of the Gulf of Suez rift, Egypt within depositional fades and sequence stratigraphy. The Mheiherrat member is represented by shoreface calcarenites and hybrid arenites (transgressive and highstand systems tracts; TST and HST; respectively) and deltaic rudites and coarse-grained calcarenites and hybrid arenites (lowstand systems tracts; LST). Petrographic, stable O- and C-isotopes, mineral chemical and geochemical analyses have revealed that the arenites are pervasively cemented by eogenetic carbonates and, to small extent, by zeolite and pyrite as well as by telogenetic palygorskite. The shoreface TST and HST calcarenites and hybrid arenites were dominantly cemented by microcrystalline grain-rimming and inter- and intragranular pore-filling calcite (delta O-13(V-PDB) = -3.6 parts per thousand to -0.3 parts per thousand and delta C-13(V-PDB) = -2.3 parts per thousand to -0.7 parts per thousand) and rhombic dolomite (delta C-13(V-PDB) = -3.9 parts per thousand to +0.9 parts per thousand and delta C-13(V-PDB) = -2.5 parts per thousand to -0.7 parts per thousand). These cements are interpreted to be formed by marine to brackish waters with delta O-13(V-SMOW) -1.2 parts per thousand to +3.2 parts per thousand, at temperature of 20-55 degrees C. The deltaic LST coarse-grained calcarenites and hybrid arenites were dominantly cemented by coarse-crystalline, inter- and intragranular pore-filling calcite (delta O-13(V-PDB) -4.4 parts per thousand to -2.3% and delta C-13(V-PDB) = -2.8 parts per thousand. to -1.3 parts per thousand.), which are interpreted to have precipitated from pore waters with delta O-13(V-SWOM) +3.5 parts per thousand. to +5.5 parts per thousand, at temperatures of greater than 55 degrees C. Such pervasive cementation by carbonates is attributed to the occurrence of abundant intrabasinal carbonate grains. The carbonate cement texture is suggested to be controlled by changes in pore-water chemistry owing to transgression and regression events. This case study revealed that better understanding of factors controlling the extent and textural habits of carbonate cements can be achieved when it is linked with depositional facies and sequence stratigraphy.

Keywords
Coarse-grained delta, Shoreface, Arenites, Diagenesis, Sequence stratigraphy
National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-206576 (URN)10.1016/j.marpetgeo.2013.04.019 (DOI)000322056600019 ()
Available from: 2013-09-02 Created: 2013-09-02 Last updated: 2017-12-06Bibliographically approved
Al-Ramadan, K., Morad, S., Norton, A. K. & Hulver, M. (2013). Linking Diagenesis and Porosity Preservation to Sequence Stratigraphy of Gas Condensate Reservoir Sandstones; the Jauf Formation (Lower to Middle Devonian), Eastern Saudi Arabia. In: Sadoon Morad, Marcelo Ketzer, Luis F. de Ros (Ed.), Linking Diagenesis to Sequence Stratigraphy (Special Publication 45 of the IAS): (pp. 297-336). John Wiley & Sons
Open this publication in new window or tab >>Linking Diagenesis and Porosity Preservation to Sequence Stratigraphy of Gas Condensate Reservoir Sandstones; the Jauf Formation (Lower to Middle Devonian), Eastern Saudi Arabia
2013 (English)In: Linking Diagenesis to Sequence Stratigraphy (Special Publication 45 of the IAS) / [ed] Sadoon Morad, Marcelo Ketzer, Luis F. de Ros, John Wiley & Sons, 2013, p. 297-336Chapter in book (Refereed)
Place, publisher, year, edition, pages
John Wiley & Sons, 2013
Series
International Association Of Sedimentologists Series
National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-94609 (URN)9781118485392 (ISBN)
Available from: 2006-05-05 Created: 2006-05-05 Last updated: 2013-09-25Bibliographically approved
Morad, S., Ketzer, J. & De Ros, L. (2013). Linking Diagenesis to Sequence Stratigraphy: An Integrated Tool for Understanding and Predicting Reservoir Quality Distribution. In: Sadoon Morad, J. Marcelo Ketzer, Luiz F. De Ros (Ed.), Linking Diagenesis to Sequence Stratigraphy: (pp. 1-36). John Wiley & Sons
Open this publication in new window or tab >>Linking Diagenesis to Sequence Stratigraphy: An Integrated Tool for Understanding and Predicting Reservoir Quality Distribution
2013 (English)In: Linking Diagenesis to Sequence Stratigraphy / [ed] Sadoon Morad, J. Marcelo Ketzer, Luiz F. De Ros, John Wiley & Sons, 2013, p. 1-36Chapter in book (Refereed)
Abstract [en]

Sequence stratigraphy is a useful tool for the prediction of primary (depositional) porosity and permeability. However, these primary characteristics are modified to variable extents by diverse diagenetic processes. This chapter demonstrates that integration of sequence stratigraphy and diagenesis is possible because the parameters controlling the sequence stratigraphic framework may have a profound impact on early diagenetic processes. The latter processes play a decisive role in the burial diagenetic and related reservoir-quality evolution pathways. Therefore, the integration of sequence stratigraphy and diagenesis allows a proper understanding and prediction of the spatial and temporal distribution of diagenetic alterations and, consequently, of reservoir quality in sedimentary successions.

Place, publisher, year, edition, pages
John Wiley & Sons, 2013
Keywords
reservoir quality distribution; sediment diagenesis; sequence stratigraphy
National Category
Geology
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
urn:nbn:se:uu:diva-213699 (URN)10.1002/9781118485347.ch1 (DOI)
Available from: 2014-01-02 Created: 2014-01-02 Last updated: 2014-01-02
Nader, F., De Boever, E., Gasparrini, M., Liberati, M., Dumont, C., Ceriani, A., . . . Doligez, B. (2013). Quantification of diagenesis impact on the reservoir properties of the Jurassic Arab D and C members (Offshore, U.A.E.). Geofluids, 13(2), 204-220
Open this publication in new window or tab >>Quantification of diagenesis impact on the reservoir properties of the Jurassic Arab D and C members (Offshore, U.A.E.)
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2013 (English)In: Geofluids, ISSN 1468-8115, E-ISSN 1468-8123, Vol. 13, no 2, p. 204-220Article in journal (Refereed) Published
Abstract [en]

An increasing need exists to quantify the impact of diagenesis on complex and heterogeneous geological reservoirs and to predict the related field-scale porosity-permeability distribution. Development of approaches to quantify diagenetic events is an important step towards the construction of integrated numerical reservoir models predicting the impact of successive diagenetic events on petrophysical properties at various scales. This article describes two distinct approaches, which allow capturing, quantifying and explaining reservoir heterogeneities of the Jurassic Arab Formation (offshore oilfield in Abu Dhabi, U.A.E.) at the field and plug scale. Based on a classical diagenesis study, whereby the major diagenetic phases were characterized, distribution patterns were highlighted to further explain reservoir heterogeneities through a set of 2D interpolation diagenesis maps across the field. The best reservoir properties are encountered in the central-northern (grainstones with syntaxial calcite overgrowth cement – typical of Arab D) and south-western (dolostones – typical of Arab C) parts of the oilfield. Following another independent approach at the scale of the plug, quantification of rock components and description of the pore space connectivity and geometry are obtained by 2D and 3D image analyses, μ-CT and pore network modelling. This latter approach resulted in a better understanding of the effect of anhydrite dissolution on the pore structure of the investigated dolostone. The overall, presented workflow provides valuable constraints for assessing reservoir heterogeneities in statistical field-scale models.

Keywords
dolomite;image analyses;interpolation maps;Micro-CT;reservoir
National Category
Geology
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
urn:nbn:se:uu:diva-213700 (URN)10.1111/gfl.12022 (DOI)
Available from: 2014-01-02 Created: 2014-01-02 Last updated: 2017-12-06Bibliographically approved
Morad, S., Al-Aasm, I. S., Nader, F. H., Ceriani, A., Gasparrini, M. & Mansurbeg, H. (2012). Impact of diagenesis on the spatial and temporal distribution of reservoir quality in the Jurassic Arab D and C members, offshore Abu Dhabi oilfield, United Arab Emirates. GeoArabia, 17(3), 17-56
Open this publication in new window or tab >>Impact of diagenesis on the spatial and temporal distribution of reservoir quality in the Jurassic Arab D and C members, offshore Abu Dhabi oilfield, United Arab Emirates
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2012 (English)In: GeoArabia, ISSN 1025-6059, Vol. 17, no 3, p. 17-56Article in journal (Refereed) Published
Abstract [en]

This study is based on petrographic examination (optical, scanning electron microscope, cathodo-luminescence, backscattered electron imaging, and fluorescence) of 1,350 thin sections as well as isotopic compositions of carbonates (172 carbon and oxygen and 118 strontium isotopes), microprobe analyses, and fluid inclusion microthermometry of cored Jurassic Arab D and C members from 16 wells in a field from offshore Abu Dhabi, United Arab Emirates. The formation was deposited in a ramp with barrier islands and distal slope setting. Petrographic, stable isotopic and fluid-inclusion analyses have unraveled the impact of diagenesis on reservoir quality of Arab D and C within the framework of depositional facies, sequence stratigraphy, and burial history. Diagenetic processes include cementation by grain rim cement and syntaxial calcite overgrowths, formation of moldic porosity by dissolution of allochems, dolomitization and dolomite cementation, cementation by gypsum and anhydrite, and stylolitization. Partial eogenetic calcite and dolomite cementation has prevented porosity loss in grainstones during burial diagenesis. Dolomitization and sulphate cementation of peritidal mud are suggested to have occurred in an evaporative sabkha setting, whereas dolomitization of subtidal packstones and grainstones was driven by seepage reflux of lagoon brines formed during major falls in relative sea level. Recrystallization of dolomite occurred by hot saline waters (T-h 85-100 degrees C; and salinity 14-18 wt% NaCl). Anhydrite and gypsum cements (T-h 95-105 degrees C; fluid salinity 16-20 wt% NaCl), were subjected to extensive dissolution, presumably caused by thermal sulfate reduction followed by a major phase of oil emplacement. The last cement recorded was a second phase of anhydrite and gypsum (T-h 95-120 degrees C; 16-22 wt% NaCl), which fills fractures associated with faults.

National Category
Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
urn:nbn:se:uu:diva-179591 (URN)000306151000002 ()
Available from: 2012-08-20 Created: 2012-08-20 Last updated: 2017-12-07Bibliographically approved
Khalifa, M. & Morad, S. (2012). Impact of structural setting on diagenesis of fluvial and tidal sandstones: The Bahi Formation, Upper Cretaceous, NW Sirt Basin, North Central Libya. Marine and Petroleum Geology, 38(1), 211-231
Open this publication in new window or tab >>Impact of structural setting on diagenesis of fluvial and tidal sandstones: The Bahi Formation, Upper Cretaceous, NW Sirt Basin, North Central Libya
2012 (English)In: Marine and Petroleum Geology, ISSN 0264-8172, E-ISSN 1873-4073, Vol. 38, no 1, p. 211-231Article in journal (Refereed) Published
Abstract [en]

This petrographic, mineral chemical, fluid inclusion, and stable isotopic study shows that the distribution of diagenetic modifications and their influence on reservoir quality and heterogeneity in tidal and fluvial sandstones of the Upper Cretaceous Bahi Sandstones in the rift Sirt Basin, NW Libya varies systematically along a series of closely-spaced, dominantly normal faults between the basin margin and more basinward-located areas. Shallow eogenetic modifications resulting from the percolation of meteoric waters, include infiltration of grain coating clays, kaolinitization of detrital silicates, and cementation by dolomite and K-feldspar overgrowths. Mesogenetic alterations (>70 °C, >2 km) include feldspar albitization, illitization of infiltrated clay and kaolinite, conversion of kaolinite into dickite, and cementation by quartz overgrowths (T h 112 °C-134 °C), barite (T h 145 °C-158 °C) and Fe-carbonates. The restriction of barite and Fe-carbonate cements to the basinward-located sandstones suggests formation by hydrothermal fluids along the faults. Extensive feldspar dissolution and formation of moldic pores in sandstones from the basin margin were probably caused by deep percolation of meteoric waters. Results from this study regarding the structural control on the spatial distribution of diagenetic alterations have implications for constraining the flux of pore fluids and, by extension, reservoir quality in analogous epicratonic rift basins.

Keywords
Diagenesis, Hydrothermal fluids, Libya, Reservoir quality, Sandstone, Sirt Basin, Structural setting, Barite, Cementing (shafts), Cements, Chemical modification, Feldspar, Kaolinite, Mineralogy, Quartz, Sedimentology, Silicates, Solvents, Structural dynamics, Cretaceous, hydrocarbon reservoir, hydrothermal fluid, structural control, Libyan Arab Jamahiriya, Sirte Basin
National Category
Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
urn:nbn:se:uu:diva-184894 (URN)10.1016/j.marpetgeo.2011.05.006 (DOI)000310668100016 ()
Available from: 2012-11-20 Created: 2012-11-15 Last updated: 2017-12-07
Mansurbeg, H., De Ros, L. F., Morad, S., Ketzer, J. M., El-Ghali, M. A., Caja, M. A. & Othman, R. (2012). Meteoric-water diagenesis in late Cretaceous canyon-fill turbidite reservoirs from the Espirito Santo Basin, eastern Brazil. Marine and Petroleum Geology, 37(1), 7-26
Open this publication in new window or tab >>Meteoric-water diagenesis in late Cretaceous canyon-fill turbidite reservoirs from the Espirito Santo Basin, eastern Brazil
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2012 (English)In: Marine and Petroleum Geology, ISSN 0264-8172, E-ISSN 1873-4073, Vol. 37, no 1, p. 7-26Article in journal (Refereed) Published
Abstract [en]

Parameters controlling the diagenetic evolution of passive margin, marine turbidites, which are important targets of hydrocarbon exploration, are poorly constrained in the literature. This study aims to unravel the conditions of diagenesis and its impact on the reservoir quality evolution from late Cretaceous canyon-filling turbiditic sandstones of the onshore portion of Espirito Santo Basin, eastern Brazil. Kaolinization (delta O-18 = +13.3 parts per thousand to +15.2 parts per thousand; delta D = 96.6 parts per thousand to -79.6 parts per thousand) and dissolution of framework silicate grains is attributed to meteoric water incursion during eodiagenesis in response to a considerable fall in relative sea-level. Eogenetic alterations also include cementation by siderite (average delta O-18 = -72 parts per thousand; delta C-13 = +9.3 parts per thousand) and pyrite. Progressive sediment burial (present depths = 1530-2027 m) resulted in the formation of poikilotopic calcite, ferroan dolomite-ankerite (average delta O-18 = -7.9 parts per thousand; delta C-13 = +2.9 parts per thousand), minor amounts of quartz overgrowths and in partial dickitization of kaolinite. Isotopic values of calcite and dolomite-ankerite follow two trends of co-variance of delta C-13 with decreasing delta O-18 and increasing temperature. From a composition closer to marine (approximate to 0 parts per thousand), one trend goes towards positive delta C-13 values (up to +22.4 parts per thousand for calcite; +18.6 parts per thousand for dolomite-ankerite), indicating increasing input of carbonate from methanogenic fermentation. The other trend develops towards negative delta C-13 values (down to -17.2 parts per thousand for calcite; 15 parts per thousand for dolomite-ankerite), suggesting increasing contribution from thermal decarboxylation with increasing temperature and depth. Despite the presence of various cement types, mechanical compaction was more important than cementation in reducing depositional porosity in the onshore Urucutuca sandstones.

Keywords
Turbidites, Diagenesis, Reservoir-quality, Urucutuca
National Category
Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
urn:nbn:se:uu:diva-183540 (URN)10.1016/j.marpetgeo.2012.03.009 (DOI)000308061200002 ()
Available from: 2012-12-07 Created: 2012-10-29 Last updated: 2017-12-07Bibliographically approved
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