High-resolution sequence stratigraphy of Upper Triassic succession (Carnian–Rhaetian) of the Zarzaitine outcrops (Algeria): A model of fluvio-lacustrine deposits

Bourquin, Sylvie; Eschard, R.; Hamouche, Brahim

doi:10.1016/j.jafrearsci.2010.04.003

Cited by 27 publications

(21 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, oxic conditions were dominant in the arid Triassic environments that were widespread across NW Europe at the time of deposition of the St Bees Sandstone Formation (Brookfield 2008;McKie and Williams 2009;McKie and Shannon 2011). Such whitesandstone layers are common within fluvial red-bed deposits more widely; they are recognized in several regions across Europe, North Africa, South and North America (Beitler et al 2005;Bourquin et al 2010;Costamagna 2012;Michalzik 1991;Waugh 1973)-for example in the Triassic of the North German Basin they were interpreted as areas locally characterized by reducing conditions which were triggered by oxidation of organic material at early diagenetic stages (Weibel 1998;Weibel and Friis 2004). The low porosity and permeability, and the small-pore size distribution (indicated by SEM, optical microscope and T 2 values) of the white-silty sandstone (Uws) may have protected these reducing areas from oxidizing fluids during later diagenetic stages.…”

Section: Results: Core-plug Upscaling For the Deep Aquifermentioning

confidence: 99%

“…However, fluvial sedimentary successions also represent productive hydrocarbon reservoirs in onshore regions of North Europe, North Africa, North America, South America and in Middle East at depths ranging from~1,000 to~2,000 m (Bourquin et al 2010;Nguyen et al 2013;Sadooni and Alsharhan 2004;Selley 1978). Investigation depths of > 150 m BGL are sufficient to avoid 'karstic' features common at shallower depths (Worthington et al 2016).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of a fluvial aquifer at a range of depths and scales: the Triassic St Bees Sandstone Formation, Cumbria, UK

2017

View full text Add to dashboard Cite

Fluvial sedimentary successions represent porous media that host groundwater and geothermal resources. Additionally, they overlie crystalline rocks hosting nuclear waste repositories in rift settings. The permeability characteristics of an arenaceous fluvial succession, the Triassic St Bees Sandstone Formation in England (UK), are described, from core-plug to well-test scale up to~1 km depth. Within such lithified successions, dissolution associated with the circulation of meteoric water results in increased permeability (K~10 −1 -10 0 m/day) to depths of at least 150 m below ground level (BGL) in aquifer systems that are subject to rapid groundwater circulation. Thus, contaminant transport is likely to occur at relatively high rates. In a deeper investigation (> 150 m depth), where the aquifer has not been subjected to rapid groundwater circulation, well-test-scale hydraulic conductivity is lower, decreasing from K~10 −2 m/day at 150-400 m BGL to 10 −3 m/day down-dip at~1 km BGL, where the pore fluid is hypersaline. Here, pore-scale permeability becomes progressively dominant with increasing lithostatic load. Notably, this work investigates a sandstone aquifer of fluvial origin at investigation depths consistent with highly enthalpy geothermal reservoirs (~0.7-1.1 km). At such depths, intergranular flow dominates in unfaulted areas with only minor contribution by bedding plane fractures. However, extensional faults represent preferential flow pathways, due to presence of high connective open fractures. Therefore, such faults may (1) drive nuclear waste contaminants towards the highly permeable shallow (< 150 m BGL) zone of the aquifer, and (2) influence fluid recovery in geothermal fields.

show abstract

Section: Results: Core-plug Upscaling For the Deep Aquifermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of a fluvial aquifer at a range of depths and scales: the Triassic St Bees Sandstone Formation, Cumbria, UK

2017

View full text Add to dashboard Cite

show abstract

“…4c, Table 1) are interpreted as high-density turbidite current deposits (Lowe, 1982;Mulder and Alexander, 2001) overlain by waning flood facies (Fml, Fig. 5e) of subaqueous environment (Bourquin et al, 2010). The fining upward sequence is typical of sand sheet supply within subaqueous environment with marine influence as attest by fossils traces of bivalves.…”

Section: Floodplain and Fluvial Deposits (Fmp Fmb Srb Sr Slb)mentioning

confidence: 96%

“…These are good for a better understanding of low frequency cycles but not for genetic units or parasequences as defined by Van Wagoner et al (1990). These sequences which are referred by Bourquin et al (2010) as not older than 1 million of year are mostly well studied on outcrops exposures. Because of the scarcity of outcrops along the Douala sub basin due to the dense rain forest and weathering, best exposures can only be studied in railways- Meyers, Rosendahl, Groschel-Becker & Austin (1996), Rosendahl and Groschel-Becker (1999), Daily et al (2002), Wilson, Turner & Westbrook (2003)).…”

Section: Introductionmentioning

confidence: 99%

Facies Analysis and Sequence Stratigraphy of Missole Outcrops: N’Kapa Formation of the South-Eastern Edge of Douala Sub-Basin (Cameroon)

Kwetche

Ntamak-Nida

Nitcheu

et al. 2017

ESR

Self Cite

View full text Add to dashboard Cite

Missole facies description and sequence stratigraphy analysis allow a new proposal of depositional environments of the Douala sub-basin eastern part. The sediments of Missole outcrops (N'kapa Formation) correspond to fluvial/tidal channel to shallow shelf deposits with in some place embayment deposits within a warm and semi-arid climate. Integrated sedimentologic, palynologic and mineralogical data document a comprehensive sequence stratigraphy of this part of the Douala sub-basin. Five facies associations occur: (1) facies association I is characterized by Floodplain deposits; (2) facies association II is Fluvial to mouth bar deposits; (3) facies association III characterise Shallow Shelf deposits; (4) facies association IV represents Distal bay or Lacustrine déposits; and (5) Facies association V is made of Fluvial channel deposits. Six depositional sequences were identified. These sequences are composed of four progradational sequences and two retrogradational sequences containing a fluvial channel portion represented by lag deposits at the base of retrogradational sequences. These deposits represent the outset of the relative sea level rise period. In the study area, the N'kapa Formation is composed of non-marine/coastal aggradational deposits representing the early stage of the regressive period. The occurrence of the estuarine/bay deposits with paleosols development is interpreted as evidence of climate change with significant relative base level fluctuation. The study of key minerals associated to sequence stratigraphy as well as palynology demonstrated that sequence architecture has been controlled mostly by climate evolution and outcrops are dated Paleocene -early Eocene.

show abstract

“…First Triassic deposits in the area following Hercynian unconformity was Trias Argilo-Gréseux Inférieur (TAGI). Its basal part is dated in the northern of Berkine Basin, by palynology, Ladinian to late Carnian ( [6], [1]). Older Triassic formations (Anisian) than TAGI are observed in outcrops in Zarzaitine, extreme Algerian south east [7]; TAGI is overlayed by the Trias carbonaté (Carnian to Norian) and TAGS (Rhaetian) [1].…”

Section: Geological Settingmentioning

confidence: 99%

Prediction of diagenesis and reservoir quality using wireline logs: evidence from the Upper Triassic (Raethian) fluvial reservoir tags - Toual field, Gassi Touil Area, SE Algeria

Mazouz

Hamimed

Yahiaoui

et al. 2017

J. Fundam and Appl Sci.

View full text Add to dashboard Cite

Reservoir quality is mainly controlled by environment deposit type and diagenesis processes.To investigate such subject we usually proceed to microscopic techniques. Absence of outcrops and missing of core samples let us use conventional wireline logs and core lab measurements as primary data. Direct lecture of well logs calibrated by core photos and wellsite description, well logs correlation and cross plots were our main methodology axis.Target of this study is the fluvial Shaly Sandstones of Upper Triassic (Rhaetian) reservoir (abreviated in French; TAGS) located in Toual field -SE of Algeria. The present investigation confirms the absence of clean sandstone levels in the studied reservoir. It detects also the presence of halite and clays (Illite) as cements in sandstone. The influence of illite on permeability was confirmed whereas porosity is less affected. Keywords ABSTRACTReservoir quality is mainly controlled by environment deposit type and diagenesis processes.To investigate such subject we usually proceed to microscopic techniques. Absence of outcrops and missing of core samples let us use conventional wireline logs and core lab measurements as primary data. Direct lecture of well logs calibrated by core photos and wellsite description, well logs correlation and cross plots were our main methodology axis.Target of this study is the fluvial Shaly Sandstones of Upper Triassic (Rhaetian) reservoir (abreviated in French; TAGS) located in Toual field -SE of Algeria. The present investigation confirms the absence of clean sandstone levels in the studied reservoir. It detects also the presence of halite and clays (Illite) as cements in sandstone. The influence of illite on permeability was confirmed whereas porosity is less affected. ABSTRACTReservoir quality is mainly controlled by environment deposit type and diagenesis processes.To investigate such subject we usually proceed to microscopic techniques. Absence of outcrops and missing of core samples let us use conventional wireline logs and core lab measurements as primary data. Direct lecture of well logs calibrated by core photos and wellsite description, well logs correlation and cross plots were our main methodology axis.Target of this study is the fluvial Shaly Sandstones of Upper Triassic (Rhaetian) reservoir (abreviated in French; TAGS) located in Toual field -SE of Algeria. The present investigation confirms the absence of clean sandstone levels in the studied reservoir. It detects also the presence of halite and clays (Illite) as cements in sandstone. The influence of illite on permeability was confirmed whereas porosity is less affected.

show abstract

High-resolution sequence stratigraphy of Upper Triassic succession (Carnian–Rhaetian) of the Zarzaitine outcrops (Algeria): A model of fluvio-lacustrine deposits

Cited by 27 publications

References 49 publications

Characterization of a fluvial aquifer at a range of depths and scales: the Triassic St Bees Sandstone Formation, Cumbria, UK

Characterization of a fluvial aquifer at a range of depths and scales: the Triassic St Bees Sandstone Formation, Cumbria, UK

Facies Analysis and Sequence Stratigraphy of Missole Outcrops: N’Kapa Formation of the South-Eastern Edge of Douala Sub-Basin (Cameroon)

Prediction of diagenesis and reservoir quality using wireline logs: evidence from the Upper Triassic (Raethian) fluvial reservoir tags - Toual field, Gassi Touil Area, SE Algeria

Contact Info

Product

Resources

About