Integrated palynological, organic geochemical, and sequence stratigraphic analyses of the middle to upper Cenomanian hydrocarbon reservoir/source Abu Roash “G” Member: A depositional model in northwestern Egypt

Deaf, Amr S.; Tahoun, Sameh S.

doi:10.1016/j.marpetgeo.2017.11.005

Cited by 28 publications

(60 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The integration of palynological data with sedimentary facies data is very valuable in interpreting depositional settings and palaeoceanographic conditions (Tyson, 1995;Koutsoukos, 2005;Deaf and Tahoun, 2018). Thus, a framework for the palaeoenvironmental interpretations in this paper was made by integrating quantitative palynological data with the sedimentological characters identified from geophysical data and the original lithological descriptions provided by the operating company.…”

Section: Quantitative Analysesmentioning

confidence: 99%

“…However, the absolute abundances (grains/g) of AOM were obtained from a separate count to counter the dilution effect of the phytoclasts to AOM (cf. Tyson, 1995;Deaf and Tahoun, 2018).…”

Section: Palynofacies and Palaeoenvironmental Interpretationmentioning

confidence: 99%

“…By integrating the geophysical data, original log descriptions and cuttings interpretations, PF-1A assemblages are derived from light grey to green shales containing some black carbonaceous material and pyrite, intercalated with thin streaks of poorly sorted sandstones and a very few dolomite layers. The low abundance but high diversity dinocyst assemblages found in PF-1A suggest deposition in marine settings of normal marine salinity (Mutterlose and Harding, 1987;Lister and Batten, 1988;Habib et al, 1992;Tahoun and Deaf, 2016;Deaf and Tahoun, 2018).…”

Section: Sedimentary Facies Of Pf-1amentioning

confidence: 99%

“…The use of the palynofacies concept in palaeoenvironmental interpretation has improved our understanding of the depositional settings of various Cretaceous sequences in northern Egypt (e.g., Mahmoud and Deaf, 2007;Tahoun and Deaf, 2016;Mahmoud et al, 2017;Deaf and Tahoun, 2018;Mahmoud et al, 2019;Gentzis et al, 2019). Previous research was based mainly on semi-quantitative abundances of palynomorphs and palynodebris, whereas here we present palaeoenvironmental interpretations of the Cretaceous of southeastern Tethys/northeastern Gondwana (i.e., Egypt) utilizing statistically defined, quantitative palynofacies analyses and dinoflagellate cyst (dinocyst) species diversity data.…”

Section: Introductionmentioning

confidence: 99%

“…Although Cretaceous climatic conditions in the western part of the Northern Gondwana Phytogeographic Province have been investigated by several authors (e.g., Doyle et al, 1982;Herngreen et al, 1996;Doyle, 1999;Méon, 2001, 2006), those of northeastern Gondwana (including Egypt) have received less attention. Palynological studies of the latter area have examined regional climate and/or ecologically-controlled regional bioevents (e.g., Abdel-Kireem et al, 1996;Schrank, 2001;Deaf et al, 2014Deaf et al, , 2016Deaf and Tahoun, 2018) but the picture is very much incomplete. To further our understanding we firstly link the sedimentary succession in the Abu Tunis 1X well from the coastal Matruh Basin in the northern part of Egypt's Western Desert to the Tethyan Cretaceous sea level curve.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Cretaceous (Hauterivian–Cenomanian) palaeoceanographic conditions in southeastern Tethys (Matruh Basin, Egypt): Implications for the Cretaceous climate of northeastern Gondwana

Deaf

Harding

Marshall

2020

Cretaceous Research

Self Cite

View full text Add to dashboard Cite

Quantitative palynological, sedimentological, and geophysical data analyses of the Cretaceous Abu Tunis 1X well from the Matruh Basin, northwestern Egypt indicate deposition of four major alternating regressive-transgressive successions. Sedimentation was largely affected by the Tethyan 2nd order sea level changes, with minor overprints by regional tectonics. The Lower Cretaceous part of the succession shows regressive sequences of deltafront to delta-top (upper Hauterivian-lowermost upper Barremian), delta channel (upper Aptian-middle Albian), and distal deltaic (upper Albian) settings that were interrupted by transgressive inner-proximal middle shelf deposits (uppermost Barremian-middle Aptian). These sediment packages correspond to Tethyan sea level fall from the late Hauterivian to late Barremian, and to the early-middle Aptian long-term sea level high stand. The Tethyan late Aptian-middle Albian long-term (2nd order) sea level rise was masked by regional late Aptian-Albian uplift, which affected deposition of the later regressive sequence. The Cenomanian shows a change in depositional setting from a proximal inner shelf (lower Cenomanian) to a middle shelf setting (middle-upper Cenomanian), corresponding to the Tethyan long-term latest early-late Cenomanian sea level rise. We demonstrate that northeastern Gondwana (Egypt) experienced different climatic conditions from other parts of the Northern Gondwana Phytogeographic Province. The climate in Egypt shifted from less warm and more humid conditions of the Hauterivian-early Barremian to a warmer and drier climate during the late Barremian-middle Aptian, although never becoming as dry as western Northern Gondwana. Warmer and more humid conditions were reestablished during the late Aptian and became even more accentuated during the Albian-Cenomanian, in contrast to the warm and much drier climate of Northern Gondwana at that time. Turonian climatic conditions may have been less humid as a result of the breakup of the 2 Western Gondwanan supercontinent and the northeasterly drift of the African continent. The climatic conditions experienced in northeastern Gondwana developed through the early-mid Cretaceous as a result of changes in palaeolatitudinal position, variations in sea level, and shifts in the Intertropical Convergence Zone, which drove fluctuations between periods of warm humid and warm dry conditions.

show abstract

Section: Quantitative Analysesmentioning

confidence: 99%

“…However, the absolute abundances (grains/g) of AOM were obtained from a separate count to counter the dilution effect of the phytoclasts to AOM (cf. Tyson, 1995;Deaf and Tahoun, 2018).…”

Section: Palynofacies and Palaeoenvironmental Interpretationmentioning

confidence: 99%

Section: Sedimentary Facies Of Pf-1amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cretaceous (Hauterivian–Cenomanian) palaeoceanographic conditions in southeastern Tethys (Matruh Basin, Egypt): Implications for the Cretaceous climate of northeastern Gondwana

Deaf

Harding

Marshall

2020

Cretaceous Research

Self Cite

View full text Add to dashboard Cite

show abstract

Palynofacies analysis and depositional environments of Upper Cretaceous sediments in the ST‐9H well, offshore South Tano Basin, Western Ghana

Achaegakwo

Atta-Peters

2021

Geological Journal

View full text Add to dashboard Cite

Palynofacies analyses were carried out on 43 cutting samples from the ST 9H well in the Tano Basin, with the view of reconstructing the palaeoenvironment of the Upper Cretaceous sediments in the well. The stratigraphic distribution of the palynofacies assemblages defined four palynofacies units. Palynofacies PA reflects deposition in near shore/shallow marine (inner neritic) environment under distal dysoxic-anoxic shelf condition. Palynofacies PB was deposited in an inner-middle neritic environment under mud-dominated oxic shelf conditions, Palynofacies PC in an open marine (outer neritic) environment under distal suboxic-anoxic basin conditions, and Palynofacies PD in a proximal-marginal marine environment under dysoxic-anoxic basin conditions. These palynofacies assemblages (PA-PD) are characterized by kerogen types II (oil prone), III-IV (gas prone), II > I (oil prone), and III (gas prone), respectively. Marker dinoflagellate and miospore assemblages recovered from the sediments -are indicative of a Campanian-Maastrichtian age. The palaeofloral association and the perideanacean dinocysts assemblage are typical of Senonian Palme Province and the Malloy suite, respectively. These assemblages are indicative of a warm and humid tropical-subtropical climatic condition.

show abstract

Petroleum generation modelling of theMiddle‐LateCretaceous sediments in the Abu Gharadig Field, Northwestern Desert, Egypt

et al. 2022

View full text Add to dashboard Cite

The present work introduces an integral study concerning the Middle‐Late Cretaceous source rocks in Abu Gharadig (AG) Field utilizing source rock evaluation techniques and hydrocarbon generation modelling. The used methods include TOC%, Rock‐Eval pyrolysis, vitrinite reflectance (Ro%), and 1D basin modelling data. Our results show that most of the studied marine Middle‐Late Cretaceous intervals in AG Field are considerable as source rocks, excluding the Abu Roash A‐D members. The Kharita, Bahariya, and Abu Roash E & G intervals have mainly gas‐prone kerogen. The Abu Roash F and Khoman B members contain mixed kerogen type II/III with oil/gas‐prone generative potential. Khoman A member has marine type II kerogen with mainly oil‐ and minor gas‐prone generative potential. Among the Middle‐Late Cretaceous rock units, the Khoman Formation is either immature or early mature, whereas others are mature enough to generate hydrocarbons. The burial history models typify a high subsidence rate during the deposition of Kharita, Bahariya, and Abu Roash formations in response to the Tethyan rifting phase. The timing of the peak of oil generation window for the Abu Roash G interval is ranged as Late Oligocene‐Early Pliocene time. Moreover, the timing of the peak of oil generation for the Abu Roash F interval is ranged as Early Miocene‐Latest Miocene. Based on transformation ratios (TR), the Abu Roash F member demonstrates a limited hydrocarbon expulsion (25% > TR <50), whereas both Abu Roash G and Khoman B members can generate in‐situ hydrocarbon (TR ≤10%). Compiling data along the AG basin from previous works infers that there are spatial and temporal discrepancies in organics composition and thermal maturity of the Middle‐Late Cretaceous intervals. Changes in paleoclimate, eustatic, and basin tectonics can be considered as the primary drivers that triggered such spatiotemporal variation. Integrated approaches are needed to constrain the multi‐geospheric interactions of major Cretaceous anoxic events in the Northwestern Desert of Egypt, and to explore the driving forces on these organics‐accumulating events.

show abstract

Integrated palynological, organic geochemical, and sequence stratigraphic analyses of the middle to upper Cenomanian hydrocarbon reservoir/source Abu Roash “G” Member: A depositional model in northwestern Egypt

Cited by 28 publications

References 71 publications

Cretaceous (Hauterivian–Cenomanian) palaeoceanographic conditions in southeastern Tethys (Matruh Basin, Egypt): Implications for the Cretaceous climate of northeastern Gondwana

Cretaceous (Hauterivian–Cenomanian) palaeoceanographic conditions in southeastern Tethys (Matruh Basin, Egypt): Implications for the Cretaceous climate of northeastern Gondwana

Palynofacies analysis and depositional environments of Upper Cretaceous sediments in the ST‐9H well, offshore South Tano Basin, Western Ghana

Petroleum generation modelling of theMiddle‐LateCretaceous sediments in the Abu Gharadig Field, Northwestern Desert, Egypt

Contact Info

Product

Resources

About