Sedimentology of an ordovician fan delta complex, Western Libya

Vos, Richard G.

doi:10.1016/0037-0738(81)90005-1

Cited by 34 publications

(15 citation statements)

References 4 publications

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“…In its Awaynat Wanin type area, this group is subdivided into four formations, the Awaynat Wanin I to IV (Ben Rahuma et al, 2008;Mergl & Massa, 2000). The same formations were also reported by Massa (1988) (Vos, 1981). Massa (1988) indicated that the radioactive shale is located at the transition between the Awaynat Wanin III and IV formations.…”

Section: D1-26 Boreholesupporting

confidence: 52%

Application of Palynomorph Darkness Index (PDI) to assess the thermal maturity of palynomorphs: A case study from North Africa

Spina

Vecoli

Riboulleau

et al. 2018

International Journal of Coal Geology

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This study focuses on the thermal maturity assessment of Silurian-Devonian sediments from the Ghadamis Basin, North Africa, comparing optical and geochemical analyses of palynomorphs. In southern Tunisia, the investigated subsurface cored section comprises the Argiles Principales Formation of Silurian age. In Libya, the succession studied covers the Awaynat Wanin III and IV formations, assigned to the Late Devonian (Frasnian-Famennian).Geochemical approaches used to reconstruct thermal alteration of sediments necessitate advanced, relatively expensive analytical techniques. In this study, the effectiveness of the less costly, relatively simple approaches of visually assessing palynomorph colour to determine thermal alteration (i.e., SCI: Spore Colour Index, TAI: Thermal Alteration Index and PDI: Palynomorph Darkness Index) was evaluated.SCI and TAI are qualitative methods, strictly related to the operator's perception, which use ten and five point scales respectively, to characterize colour in terms of illustrated specimens and/or descriptions. In contrast, PDI is obtained from the measurement of the red, green and blue (RGB) intensities of light transmitted through palynomorphs, using standard optical microscopes and digital cameras.The palynomorph-based thermal alteration estimates were compared to Rock-Eval pyrolysis data from the same samples. This calibration showed a linear relationship between these quantitative parameters and PDI. These results show that PDI is more reliable than the SCI and TAI methods.

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Section: D1-26 Boreholesupporting

confidence: 52%

Application of Palynomorph Darkness Index (PDI) to assess the thermal maturity of palynomorphs: A case study from North Africa

Spina

Vecoli

Riboulleau

et al. 2018

International Journal of Coal Geology

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“…The type section of the Hawaz Formation is on the Gargaf uplift and is composed of well-stratified sandstones with minor intercalations of silty shales. Vos (1981) suggested that the Hawaz Formation was deposited in a fan delta complex, which prograded across the Al Gargaf area. Massa and Collomb (1960) divided the Hawaz formation into two new conformable formations, named Ash Shabiyat and Hawaz (Fig.…”

Section: Cambrian-ordovician Sequencementioning

confidence: 97%

“…The boundary of the lower part of the Cambro- Ordovician section is an angular unconformity with Precambrian rocks. It consists of the Hasawnah and Hawaz formations representing fluvial deltaic conditions (Said, 1974;Vos, 1981). In wells A1-NC186 and H29-NC115, the Hasawnah formation is not present (see Table 5).…”

Section: D Numerical Modelling: Conceptual Model and Burial Historymentioning

confidence: 98%

Thermal history and source rock characterization of a Paleozoic section in the Awbari Trough, Murzuq Basin, SW Libya

Belaid

Krooß

Littke

2010

Marine and Petroleum Geology

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“…The basal deposits are typically overlain by a succession of fine-to medium-grained shallow marine, estuarine, deltaic and fluvial sediments including, for example, the Hamra Quartzite and Haouaz Formations of Libya (Vos 1981). Such sediments are identified at outcrop in southern Algeria (Beuf et al 1971), southern Libya (Burollet & Byramjee 1969, Bellini & Massa 1980, Turner 1980Klitzch 1981, Vos 1981, Clark-Lowes & Ward 1991, northern Sudan (Klitzsch & Wycisk 1987), eastern Egypt (Seilacher 1990) and Jordan (Selley 1972).…”

Section: Depositional Models Of Reservoir Faciesmentioning

confidence: 99%

“…Such sediments are identified at outcrop in southern Algeria (Beuf et al 1971), southern Libya (Burollet & Byramjee 1969, Bellini & Massa 1980, Turner 1980Klitzch 1981, Vos 1981, Clark-Lowes & Ward 1991, northern Sudan (Klitzsch & Wycisk 1987), eastern Egypt (Seilacher 1990) and Jordan (Selley 1972). In the subsurface of eastern Algeria and southern Tunisia, several distinctive offshore mudstone horizons, such as the E1 Gassi and Azzel Shales, also occur within the Ordovician (Hmidi et al 1991).…”

Section: Depositional Models Of Reservoir Faciesmentioning

confidence: 99%

Lower Palaeozoic reservoirs of North Africa

Crossley¹,

McDougall²

1998

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This paper provides an overview of features considered significant in the exploration and development of Lower Palaeozoic reservoirs of North Africa. Information is derived from a review of literature on the Lower Palaeozoic successions of north Africa, combined with outcrop observations from the Anti Atlas mountains of Morocco. The focus of the exploration-oriented part of the review is on identification of potential traps other than two-way structural dip closure. Stratigraphic elements described include depositional models of reservoir facies, tectonic unconformities and possible eustatic unconformities. Cases of established or potential trapping by post-depositional faulting, by diagenesis and by hydrodynamic flow are examined. Development-related topics highlighted include the impact on reservoir matrix quality of burial diagenesis and of palaeo-weathering at the Hercynian unconformity. Other issues discussed which additionally affect producibility from the reservoir matrix include tectonic fracturing, palaeotopography and unloading fracturing at the Hercynian unconformity, and induced fracturing within the present stress regimes.

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Sedimentology of an ordovician fan delta complex, Western Libya

Cited by 34 publications

References 4 publications

Application of Palynomorph Darkness Index (PDI) to assess the thermal maturity of palynomorphs: A case study from North Africa

Application of Palynomorph Darkness Index (PDI) to assess the thermal maturity of palynomorphs: A case study from North Africa

Thermal history and source rock characterization of a Paleozoic section in the Awbari Trough, Murzuq Basin, SW Libya

Lower Palaeozoic reservoirs of North Africa

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