Determining the age and depositional model of the Doig Phosphate Zone in northeastern British Columbia using conodont biostratigraphy

Golding, Martyn; Orchard, Michael J.; Zonneveld, John‐Paul; Wilson, N. S. F.

doi:10.2113/gscpgbull.63.2.143

Cited by 23 publications

(13 citation statements)

References 38 publications

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“…1a). These Formations were deposited during the Early and Middle Triassic (Golding et al, 2015b;Orchard and Zonneveld, 2009) on the western margin of Pangaea and recent studies suggest a fore-arc basin geodynamic setting (Beranek and Mortensen, 2011;Rohais et al, 2016). At the time of the deposition, the basin was located in latitudes inferior to 30°N (Fig.…”

Section: The Montney and Doig Formationsmentioning

confidence: 97%

Controlling factors on source rock development: implications from 3D stratigraphic modeling of Triassic deposits in the Western Canada Sedimentary Basin

Crombez

Rohais

Baudin

et al. 2017

Bull. Soc. géol. Fr.

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-The recent development of unconventional resources has triggered a regain of interest for source-rocks. The presence of hydrocarbons in these unconventional systems is generally associated with organic-rich sediments. This study aims at better understanding the factors controlling the accumulation of marine organic matter at basin scale, using a process-based approach. This work focuses on the Montney, Doig and Halfway Formations (Lower and Middle Triassic, Alberta and British Columbia, Canada). Recent studies show that the Triassic strata of the Western Canada sedimentary basin can be considered as a transitional period between the Paleozoic passive margin and the Jurassic foreland basin. Based on a 3D regional stratigraphic architecture and on a description of the organic rich interval distribution, a processbased numerical model (DionisosFlow and DORS) has been used to simulate the stratigraphic evolution of the Montney, Doig and Halfway Formations and reproduce the organic distribution in these formations. This modeling approach allowed us to test different scenarios of primary productivity and basin restriction and discuss the regional controls on organic matter accumulation such as dynamic of anoxia or dilution of organic matter by detrital sediments. The reconstruction of the stratigraphic architecture emphasizes a major drop of the water discharge in the basin. In the absence of any evidence supporting a link with a climate change, the drop in water discharge suggests a major modification of the drainage area of the basin, potentially associated with the early stage of the cordilleran orogeny and foreland basin evolution. The numerical simulation also shows that the primary productivity rates in the Montney and Doig Formations are characteristic of a coastal area and that a basin restriction is required to account for the level of anoxia observed in the studied Formations. Lastly, this study investigates the regional controls on organic matter accumulation and emphasizes the impact of regional paleogeographic and geodynamic evolution on the dynamic of anoxia and on the dilution.Keywords: source rocks / stratigraphic modeling / organic matter / sedimentary fluxes / primary productivity / basin anoxia Résumé -Facteurs de contrôles sur la formation des roches mères : apport d'une modélisation stratigraphique 3D des formations du Trias du bassin ouest canadien. Le développement récent des hydrocarbures non conventionnels a suscité un regain d'intérêt pour les roches mères. La présence d'hydrocarbures dans ces systèmes non conventionnels est souvent associée à des dépôts riches en matière organique primaire. Cette étude vise à mieux comprendre les facteurs contrôlant l'accumulation de la matière organique en domaine marin à grande échelle, en utilisant une approche basée sur les processus.

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Section: The Montney and Doig Formationsmentioning

confidence: 97%

Controlling factors on source rock development: implications from 3D stratigraphic modeling of Triassic deposits in the Western Canada Sedimentary Basin

Crombez

Rohais

Baudin

et al. 2017

Bull. Soc. géol. Fr.

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“…몬트니층은 하부의 페름기 내지 석탄기의 벨로이(Belloy)층, 디볼트 (Debolt)층을 부정합으로 덮으며, 상부의 도이그층과는 정합의 관계 이다( Fig. 3) (Edwards et al, 1994;Kendall, 1999 (Edwards et al, 1994;Markhasin, 1997;Kendall, 1999;Golding et al, 2015). 지표면부터 몬트니층의 최 상부까지의 깊이는 북동쪽에서 남서쪽으로 가면서 약 500 m에서 약 4,500 m로 깊어지는 양상을 보이고, 몬트니층의 두께 역시 동쪽에서 서쪽으로 가면서 점차 두꺼워지는 쐐기 형태로 나타난다 (Edwards et al, 1994).…”

Section: Formulaeunclassified

“…몬트니층의 암상은 주로 암회색의 돌로마이트질, 석 회암질 실트암 또는 셰일로 구성되어 있으며, 지역에 따라 세립질 사 암이나 백운암을 포함하기도 한다( Fig. 2) (Edwards et al, 1994;Kendall, 1999;Rokosh et al, 2012;National Energy Board, 2013;Golding et al, 2015). (Fig.…”

Section: Formulaeunclassified

The effect of mineral composition and rock fabric on brittleness index: an example using the Montney Formation, Canada

Son¹,

Lee²,

Kwon³

2018

J Pet Sediment Geol

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This study deals with brittleness index, which is a conceptual property that affects fracture behavior in rocks. Generally, more fracture networks are developed in more brittle rocks. For this reason, brittleness has been used as a guide to decide the target formation of hydraulic fracturing stimulation for shale and tight gas productions. Previous studies have been conducted to find out which factors have influences on the estimations of various brittleness indices to represent rock brittleness quantitatively. The objective of this study is to investigate the effect of rock fabric on the estimation of the mineralogy-based brittleness index. Both elastic moduli-and mineralogy-based brittleness indices, which are the most commonly used indices, are obtained using available data from the Montney Formation, Canada. The former index is evaluated using the Young's modulus and the Poisson's ratio that are calculated from the sonic and density logs. The latter index is estimated based on the mineral composition from X-ray diffraction quantitative analysis. Comparison between the results from two different methods indicates that quartz might be the controlling mineral on the brittleness index of the lower Montney Formation. Thin section observations, however, show that the strength of the lower Montney Formation might be determined by dolomite and clay considering matrix-supported textures. This means that rock strength and brittleness may not be governed by same controlling factors. This suggests that rock fabrics, such as anisotropy due to the lamination or quantitative analysis of minerals which constitute grain, cement, and matrix through thin section observation, should be considered in addition to the mineral composition in order to evaluate mineralogy-based brittleness index more accurately.

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“…Within sequence A, the maximum backstepping of the sedimentary system occurs during the second sequence (figure 2). Based on the biostratigraphic works of Orchard and Zonneveld (2009) and Golding et al (2015b), sequence A and B are respectively Lower Triassic and Middle Triassic in age. Within sequence A, sequence 2 was deposited above the Induan-Olenekian boundary and sequence 3 lays on top of the Smithian-Spatian boundary.…”

Section: Stratigraphic Settings and Chronostratigraphymentioning

confidence: 99%

Basin scale distribution of organic matter in marine fine-grained sedimentary rocks: Insight from sequence stratigraphy and multi-proxies analysis in the Montney and Doig Formations

Crombez

Baudin

Rohais

et al. 2017

Marine and Petroleum Geology

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Determining the age and depositional model of the Doig Phosphate Zone in northeastern British Columbia using conodont biostratigraphy

Cited by 23 publications

References 38 publications

Controlling factors on source rock development: implications from 3D stratigraphic modeling of Triassic deposits in the Western Canada Sedimentary Basin

Controlling factors on source rock development: implications from 3D stratigraphic modeling of Triassic deposits in the Western Canada Sedimentary Basin

The effect of mineral composition and rock fabric on brittleness index: an example using the Montney Formation, Canada

Basin scale distribution of organic matter in marine fine-grained sedimentary rocks: Insight from sequence stratigraphy and multi-proxies analysis in the Montney and Doig Formations

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