The Cambrian-Ordovician succession in the Ougarta Range (western Algeria, North Africa) and interference of the Late Ordovician glaciation on the development of the Lower Palaeozoic transgression on northern Gondwana

Ghienne, Jean‐François; Boumendjel, Kheira; Paris, Florentin; Rachebœuf, Patrick R.; Videt, Blaise; Salem, Hamid Aït

doi:10.3140/bull.geosci.2007.03.183

Cited by 97 publications

(46 citation statements)

References 49 publications

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“…The Lower Palaeozoic succession ( Fig. 1a & d) comprises a Cambrian to Ordovician transgressive wedge (fluvial to shallowmarine succession), an end-Ordovician, erosion-based glacially-related unit, overlain by a Silurian to Early Devonian regressive wedge (inner shelf to fluvial) (Bellini and Massa, 1980;Boote et al, 1998;Davidson et al, 2000;Abugares, 2003;Eschard et al, 2005;Le Heron et al, 2006, 2010Ghienne et al, 2007aGhienne et al, , 2013.…”

Section: Geological and Glacial Settingsmentioning

confidence: 96%

Sedimentary imprints of former ice-sheet margins: Insights from an end-Ordovician archive (SW Libya)

Girard

Ghienne

Du-Bernard

et al. 2015

Earth-Science Reviews

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Section: Geological and Glacial Settingsmentioning

confidence: 96%

Sedimentary imprints of former ice-sheet margins: Insights from an end-Ordovician archive (SW Libya)

Girard

Ghienne

Du-Bernard

et al. 2015

Earth-Science Reviews

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“…Later work on the sedimentology and reservoir geology of the Cambro-Ordovician of the super giant Hassi Messaoud oil field and the surrounding Saharan Platform (Balducchi and Pommier, 1970;Aliev et al, 1971;Whiteman, 1971;Ali, 1973;Chiarelli, 1978). The most recent publications have used palynology and sequence stratigraphic approaches to try and correlate the Cambro-Ordovician sequences (Legrand, 1985;Fekirine and Abdellah, 1998;Vecoli et al, 1995;Vecoli and Playford, 1997;Vecoli et al, 1999;Vecoli, 2000;Carr, 2002;Ghienne et al, 2007). The first biostratigraphic evidence of Middle to Late Cambrian sedimentation in the Algerian subsurface resulted from the palynological analysis of pre-Ordovician clastic sequences penetrated by borehole AMG-1 in northwestern Algeria (Vecoli et al, 2008).…”

Section: Introductionmentioning

confidence: 97%

Chemostratigraphy, tectonic setting and provenance of the Cambro-Ordovician clastic deposits of the subsurface Algerian Sahara

Sabaou¹,

Aït-Salem

Zazoun

2009

Journal of African Earth Sciences

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“…However, in the outcrop, the equivalent rocks highlight a large panel of sedimentary facies and architectures, resolving the stratigraphy and the paleodepositional environments (Blanpied et al, 2000;Ghienne et al, 2003Ghienne et al, , 2007aGhienne et al, , 2010Le Heron et al, 2004;Moreau, 2005Moreau, , 2011Le Heron and Craig, 2008;Girard et al, 2012aGirard et al, , 2012b.…”

Section: Introductionmentioning

confidence: 98%

Glacial sedimentology interpretation from borehole image log: Example from the Late Ordovician deposits, Murzuq Basin (Libya)

Moreau

Joubert²

2016

Interpretation

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In the Murzuq Basin, the Late Ordovician glaciogenic succession forms a very complex clastic reservoir system. Although the structural setting is simple, the architecture of the stratigraphic succession is particularly intricate, and conventional wireline logs display rather homogeneous signatures. However, when exposed, the glaciogenic sedimentary succession indicates a very large range of depositional environments and clear stratigraphic changes. Based on high-quality processing and interpretation of wireline microresistivity image logs over a single well, our method allows the precise recognition of the internal sedimentary structures and supports the interpretation of the depositional environments within the Late Ordovician succession. During interpretation, it is possible to draw a descriptive sedimentological log, similar to a standard log from cores or outcrops. The image log is interpreted like a regular sedimentary log and compared to an outcrop analog from the nearby outcrop area of Ghat. The success of the well analysis resides in the quality of the borehole image log, permitting the recognition of sandstone grain sizes, textures (facies), and sorting. In addition, crucial information is extracted from the identification of glacial surface and ice-flow orientations, which, combined with the recognition of major transgressive events, allows the recognition and correlation of glacial-type stratigraphy. As in the modern Pleistocene glaciation, stadial/interstadial and glacial/interglacial stages are identified from resistivity imaging of the Libyan Ordovician succession. In addition to the unprecedented potential of correlation between wells within the basin, the sedimentary information extracted from the borehole image log provides important insights on the paleogeographic context of the basin and thus on the exploration potential of the prolific Ordovician-Silurian petroleum system. IntroductionWell petrophysical data interpretations are crucial in petroleum exploration and production. They are routinely conducted and provide essential insights on the quality of the rocks involved in the petroleum system. However, in some sedimentary environments, the acoustic and the petrophysical measurements are not able to provide sufficient diagnostic information to characterize reservoir properties and geometries. The limits of the use of standard logs arise from (1) the possible confusion between formations with similar sand/shale ratios (e.g., basal lag with large shaley clasts formations and sandrich debris flow) and (2) the limited resolution and the smearing effect of standard logs, which do not provide any detailed sedimentological information of the penetrated strata. On the contrary, bed thickness, bed contacts, or postdepositional events, which are important

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The Cambrian-Ordovician succession in the Ougarta Range (western Algeria, North Africa) and interference of the Late Ordovician glaciation on the development of the Lower Palaeozoic transgression on northern Gondwana

Cited by 97 publications

References 49 publications

Sedimentary imprints of former ice-sheet margins: Insights from an end-Ordovician archive (SW Libya)

Sedimentary imprints of former ice-sheet margins: Insights from an end-Ordovician archive (SW Libya)

Chemostratigraphy, tectonic setting and provenance of the Cambro-Ordovician clastic deposits of the subsurface Algerian Sahara

Glacial sedimentology interpretation from borehole image log: Example from the Late Ordovician deposits, Murzuq Basin (Libya)

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