Sedimentology of meandering river deposits: advances and challenges

Ghinassi, Massimiliano; Colombera, Luca; Mountney, Nigel P.; Reesink, A.

doi:10.1002/9781119424437.ch1

Cited by 2 publications

(4 citation statements)

References 102 publications

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“…Indeed, correlations between planform evolution (i.e. scroll‐bar pattern) and related point‐bar geometries were carried out for fluvial meanders (Pranter et al ., 2007; Ghinassi et al ., 2013, 2014; Ielpi & Ghinassi, 2014; Ghinassi & Ielpi, 2015; Yan et al ., 2017, 2019; Willis & Sech, 2018a; Ghinassi et al ., 2019a; Parquer et al ., 2019) along with models concerning along‐bend grain‐size distribution (Purkait, 2002; Frings, 2008; Smith et al ., 2009, 2011; Bhattacharyya & Bhattacharya, 2015; Ghinassi & Ielpi, 2015; Clift et al ., 2019; Hagstrom et al ., 2019). Comparable insights are conversely missing for intertidal meanders, whose planform evolution has been inferred only for short time intervals (Choi et al ., 2013; Ghinassi et al ., 2018b) and for which the spatial distribution of sediment grain size was mainly investigated with vertical, rather than along‐channel, trends (de Mowbray, 1983; Dalrymple et al ., 1990; Pearson & Gingras, 2006; Choi, 2011; Choi et al ., 2013; Choi & Jo, 2015).…”

Section: Introductionmentioning

confidence: 99%

Ontogeny of a subtidal point bar in the microtidal Venice Lagoon (Italy) revealed by three‐dimensional architectural analyses

et al. 2022

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Sedimentological and architectural features of meandering subtidal channels are relatively unexplored, and their deposits are commonly investigated based on facies models set up for intertidal meandering channels. The Venice Lagoon (northern Adriatic Sea, Italy) is affected by a micro-tidal regime and hosts a dense network of active and buried tidal channels. It represents an excellent natural laboratory to improve the current knowledge on subtidal meander morphodynamics and related deposits. In this study, the integration of high-resolution geophysical images and core data allows reconstruction of the architectural three-dimensional model of a meandering subtidal palaeochannel, which is buried below a modern subtidal flat. The study palaeochannel was 35 m wide and 3 m deep, and formed three adjacent meander bends and related point bars. A detailed three-dimensional architectural reconstruction was carried out for deposits associated with one of these meander bends, that was crossed by a minor, low-sinuosity channel with two minor bank-attached bars. This reconstruction highlights that the study point bar has a horseshoe shape, which arose from the onset of bar accretion from an already-sinuous channel. Reconstructed growth stages of the studied bends show that point-bar accretion can follow different styles of planform transformation, also experiencing simultaneously landward (or seaward) deposition according to the dominant flow direction (i.e. local tidal asymmetry). The analyses show that planform transformations occurred in parallel with elevation changes of the related channel thalweg, which shaped pools with geometry varying with the radius of curvature of the bend. The present study highlights the relevance of high-resolution threedimensional reconstructions to link palaeomorphodynamic processes with related sedimentary products.

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Section: Introductionmentioning

confidence: 99%

Ontogeny of a subtidal point bar in the microtidal Venice Lagoon (Italy) revealed by three‐dimensional architectural analyses

et al. 2022

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“…However, it provides an approach that extracts the greatest amount of information from limited data sets, allowing the evolution of ancient channels to be reconstructed. Hence, this approach could be applied to palaeochannel reconstruction of outcrop analogues, using information on river channel migration, spatio‐temporal variation of point bar geometry and facies, and outcrop orientation (Ghinassi et al, 2018; Willis, 1989).…”

Section: Discussionmentioning

confidence: 99%

“…To reveal the meander‐bend planform evolution of subsurface fluvial successions, it is important to identify migration patterns in well‐to‐well cross‐sections. The relationship between the channel planform evolution of MMRs and the subsurface reservoir architecture of AMRs has been discussed in many previous studies (Ghinassi et al, 2014, 2018; Ielpi & Ghinassi, 2014; Lin et al, 2018b; Shan et al, 2018a). The fundamental relationship between morphological evolution and the internal architecture of meandering river deposits is indicated in the change in dip azimuth and angle of inclined beds, including the first‐order to fourth‐order bounding surfaces (Figure 3).…”

Section: Meander‐bend Migration Patternsmentioning

confidence: 95%

“…expansion, translation, rotation or a combination thereof) (Chen et al, 2017; Ghinassi & Ielpi, 2015; Ghinassi et al, 2014; Hooke et al, 2011; Ielpi & Ghinassi, 2014; Johnston & Holbrook, 2018; Lin et al, 2017; Seminara, 2006), reconstruction of the evolutionary process of AMRs is a major challenge (Willis & Sech, 2018a). Developments in fluvial sedimentology, reservoir architecture, well‐log geology and numerical simulation mean that the reconstruction of AMRs is increasingly attracting global attention (Fustic et al, 2019; Ghinassi & Ielpi, 2015; Ghinassi et al, 2016, 2018; Hossain & Imranuzzaman, 2019; Hritz & Wilkinson, 2006; Ielpi & Ghinassi, 2014, 2015; Parquer et al, 2017; Qiao et al, 2019; Santos & Owen, 2016; Shan et al, 2018a; Shibata et al, 2018; Yan et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Reconstruction of meander‐bend migration from associated channel‐belt architecture recorded in successions of ancient meandering rivers: A case study from the Cretaceous Songliao Basin, China

Lin

Wang

Shan

et al. 2021

The Depositional Record

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Identification of the diverse channel patterns of meander‐bend migration is essential when reconstructing the historical evolution of sedimentary processes in meandering rivers. However, reconstruction of the spatio‐temporal evolution of ancient meandering fluvial deposits for hydrocarbon exploration is difficult due to the limited research on the patterns and styles of meander‐bend migration. To reconstruct the geomorphologic and sedimentary evolution of subsurface meandering palaeochannels, this study proposes an approach based on combining meander‐bend planforms and cross‐sectional architectural elements of clastic sedimentary successions of ancient meandering rivers. The research was applied to meandering fluvial deposits of the lower Cretaceous Quantou Formation in the north‐eastern Songliao Basin, China. High‐resolution satellite images of modern meandering rivers were used to classify and evaluate the meander‐bend planform transformations of expansion, rotation and contraction (also known as bend tightening, i.e. narrowing of the neck of the meander‐bend showing a tendency towards neck tightening or cut‐off). Major meander‐bend transformations were related to cross‐sectional bedding architecture (i.e. bed dipping or bounding surface), which was identified through well‐log and core characteristics, to construct the migration patterns of subsurface meander‐belt deposits. Integration of well‐log and core analysis from a dense array of wells allowed the stratigraphic architecture of ancient meandering rivers and stacking patterns of fluvial sandbodies to be characterised. Furthermore, major reservoir architectural elements and bounding surfaces of meandering channels were identified. Ultimately, the 3D meandering fluvial architecture was represented on 2D vertical sections so that, planform transformations and the evolutionary processes of point bars and meander bends could be elucidated. Reconstruction of meander‐bend migration is of practical value for deciphering ancient fluvial systems and the development of subsurface fluvial reservoir models.

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Sedimentology of meandering river deposits: advances and challenges

Cited by 2 publications

References 102 publications

Ontogeny of a subtidal point bar in the microtidal Venice Lagoon (Italy) revealed by three‐dimensional architectural analyses

Ontogeny of a subtidal point bar in the microtidal Venice Lagoon (Italy) revealed by three‐dimensional architectural analyses

Reconstruction of meander‐bend migration from associated channel‐belt architecture recorded in successions of ancient meandering rivers: A case study from the Cretaceous Songliao Basin, China

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