Triassic Transgressive-Regressive Cycles in the Bresse-Jura and Adjacent Basins, Eastern France

Dromart, G.; Monier, P.; Curial, Alain; Moretto, Robert; Guillocheau, François

doi:10.1007/978-3-642-78849-9_24

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…The intra-Norian unconformity was first identified in the Paris Basin by Bourquin and Guillocheau [61,24] and subsequently recognized in the Bre se-Jura Basin [196]. In the German Basin it might be the time-equivalent of the erosional truncation of the Stubensandstein [194], and of the intra-Norian discontinuity of the Barents Sea and the 0010- mites [123].…”

Section: /2 Tectonic and Geodynamic Significance Of The Triassic mentioning

confidence: 99%

Meso-Cenozoic geodynamic evolution of the Paris Basin: 3D stratigraphic constraints

et al. 2000

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Section: /2 Tectonic and Geodynamic Significance Of The Triassic mentioning

confidence: 99%

Meso-Cenozoic geodynamic evolution of the Paris Basin: 3D stratigraphic constraints

et al. 2000

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“…Because, first, the gas reservoir is always located 100 to 150 m below top Keuper and second because the Lettenkhole formation is regionally observed and not the upper Keuper equivalent "dolomie de Beaumont". This latter one disappears northward of Vaux as well as salty evaporitic facies (Dromart et al, 1994).…”

Section: Stratigraphic Settingmentioning

confidence: 93%

Vaux-en-Bugey (Ain, France): the first gas field produced in France, providing learning lessons for natural hydrogen in the sub-surface?

Deronzier¹,

Giouse

2020

BSGF - Earth Sci. Bull.

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The former Vaux-en-Bugey field, first French methane production from early 20th century, is revisited as a case study to address the present generation and accumulation theories for gases like hydrogen and helium. The volume of the initial gas in place is estimated to be 22 million m3. Based on a composition of 5% of hydrogen and 0.096% of helium, the volumes of these gases in the field were respectively around 1.1 million m3 for hydrogen and 24 000 m3 for helium. The different hypotheses of hydrogen sources are reviewed: serpentinization, hydro-oxidation of siderite, water radiolysis, bio-fermentation, mechanical generation, degassing from depth trough faults, steel corrosion. For helium generation, the different sources of radioactive minerals and intermediate accumulations are examined. The most probable scenario is the hydrogen production by water radiolysis and helium production by radioactive decay in or near the basement, migrating trough deep faults, stored and concentrating in an aquifer with thermogenic methane, then flushed by methane into the gas field, during Jura thrusting. New measurements with portable gas detector, incomplete but including hydrogen, on a former exploration well with accessible flux of gas, give the opportunity to comment gas saturation evolution more than a century after the 1906 discovery. The decreasing of hydrogen content since the discovery of the field is probably due to Sulphate-Reducing Bacteria activity.

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“…Chemical sequence stratigraphy is consistent with the transgressive-regressive (T-R) model of classical sequence stratigraphy. The basic theory of the T-R model is that taking the lowest point of relative sea level decline as the sequence boundary, the highest point of relative sea level rise as the maximum sea flooding surface, and a sedimentary sequence with a relative sea level rise and fall cycle as a sequence, the sequences can be divided into transgressive system tracts and regressive system tracts [36][37][38]. Chemical sequence stratigraphy also responds to the relative rise and fall of sea level, which is similar to the T-R model, and the sequences division method of chemical sequence stratigraphy is not determined by lithology, but by geochemical element combination indices.…”

Section: Establishing the Chemical Sequence Stratigraphy Theory Modelmentioning

confidence: 99%

“…rise as the maximum sea flooding surface, and a sedimentary sequence with a relative sea level rise and fall cycle as a sequence, the sequences can be divided into transgressive system tracts and regressive system tracts [36][37][38]. Chemical sequence stratigraphy also responds to the relative rise and fall of sea level, which is similar to the T-R model, and the sequences division method of chemical sequence stratigraphy is not determined by lithology, but by geochemical element combination indices.…”

Section: Establishing the Chemical Sequence Stratigraphy Theory Modelmentioning

confidence: 99%

Application of Chemical Sequence Stratigraphy to the Prediction of Shale Gas Sweet Spots in the Wufeng and Lower Longmaxi Formations within the Upper Yangtze Region

et al. 2022

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Effective shale gas exploration is hindered by the need for obtaining high-resolution correlations between shale strata and the need for classifying shale facies. To address these issues, chemostratigraphy, sequence stratigraphy, and shale gas geology methods were integrated to develop a new method known as “chemical sequence stratigraphy,” which was successfully applied to the Wufeng–Lower Longmaxi Formations in the upper Yangtze region. Well Huadi 1 was used as a case study, and detailed data were acquired. Multivariate statistical analyses were applied to three defined indices having different genetic significance, namely: terrigenous input intensity (TII), authigenic precipitation intensity (API), and organic matter adsorption and reduction intensity (OARI). By analyzing the trends of these three indices, the Wufeng–Lower Longmaxi Formations were divided into five fourth-order chemical sequences (from bottom to top): LCW, MCL1-1, MCL1-2, MCL1-3, and MCL1-4. The geochemical facies were named and classified using the chemical sequence stratigraphic framework. The enrichment factor (EF) transformation of elements was conducted to determine whether an element is rich or deficient. The results showed that the favorable geochemical facies in the well were EF-Al deficient, EF-Ca rich, and EF-V rich. The organic matter content and rock brittle strength were then used as chemical parameters, and it was predicted that the LCW and MCL1-1 chemical sequences most likely comprised shale gas sweet spots. This conclusion is consistent with the drilling results and indicates that our proposed method is effective and reliable. This method is further applied to the Changning Shuanghe section, the Shizhu Liutang section, and sections in the Xindi 1 well in the upper Yangtze region. The comparative study of these four sections showed that LCW and MCL1-1 are the key chemical sequences for shale gas exploration and development in the Wufeng–Lower Longmaxi Formations within the Upper Yangtze region.

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Triassic Transgressive-Regressive Cycles in the Bresse-Jura and Adjacent Basins, Eastern France

Cited by 5 publications

References 6 publications

Meso-Cenozoic geodynamic evolution of the Paris Basin: 3D stratigraphic constraints

Meso-Cenozoic geodynamic evolution of the Paris Basin: 3D stratigraphic constraints

Vaux-en-Bugey (Ain, France): the first gas field produced in France, providing learning lessons for natural hydrogen in the sub-surface?

Application of Chemical Sequence Stratigraphy to the Prediction of Shale Gas Sweet Spots in the Wufeng and Lower Longmaxi Formations within the Upper Yangtze Region

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