Implications of palaeosols in low net-to-gross fluvial architecture reconstruction: Reservoir analogues from Patagonia and Spain

2021 ◽  
pp. 110553
Author(s):  
Augusto Nicolás Varela ◽  
Luis Miguel Yeste ◽  
César Viseras ◽  
Fernando García-García ◽  
Damián Moyano Paz
Keyword(s):  
Net To Gross ◽  
Fluvial Architecture

Fluvial architecture and sequence stratigraphy of the Burro Canyon Formation, southwestern Piceance Basin, Colorado

2020 ◽  
Vol 8 (4) ◽  
pp. T1037-T1055
Author(s):  
Jerson J. Tellez Rodriguez ◽  
Matthew J. Pranter ◽  
Rex Cole
Keyword(s):  
Piceance Basin ◽  
Fluvial System ◽  
Depositional Sequence ◽  
Fluvial Deposits ◽  
Valley Fill ◽  
Architectural Elements ◽  
Base Level ◽  
Net To Gross ◽  
High Base ◽  
Fluvial Architecture

The Lower Cretaceous Burro Canyon Formation in the southwestern Piceance Basin, Colorado, is composed of deposits that represent a braided fluvial system with high net to gross that transitions stratigraphically upward into a low net-to-gross, low-sinuosity, meandering fluvial system. The fluvial deposits are composed of multiple upward-fining, conglomeratic-to-sandstone successions forming bars and bar sets that exhibit inclined heterolithic strata that we have interpreted to have formed by oblique and downstream accretion. We used well-exposed outcrops, detailed measured sections, and unmanned aerial system-based imagery to describe the fluvial architecture of the Late Cretaceous formation using a hierarchical approach. We described the Burro Canyon Formation as comprising sandstone-rich amalgamated channel complexes (ACC) overlain by non- to semiamalgamated channel complexes. The lower interval of the formation is composed of ACC that contain channel-fill elements with cross-stratification and numerous truncated contacts. These stacked channel-fill elements exhibit an apparent width range of 137–1300 ft (40–420 m) and a thickness range of 5–60 ft (1.5–18 m). The upper interval of the Burro Canyon Formation comprises mudstone-prone intervals of the nonamalgamated channel complex with isolated channel-fill elements interbedded with floodplain mudstones that represent a period of relatively high base level. Associate channel fill elements range in apparent width from 200 to 1000 ft (60 to 300 m) and thickness from 20 to 30 ft (6 to 18 m). The characteristics and spatial distribution of architectural elements of the Burro Canyon Formation correspond to one depositional sequence. The erosional basal surface of the formation, as well as lateral changes in thickness and net to gross, suggest that the Burro Canyon Formation within this study area was deposited as an incised valley fill. Fluvial deposits of the Burro Canyon Formation serve as outcrop analogs for subsurface interpretations in similar reservoirs.

Simplified Approach to Calculating Geometric Stiffness Properties of Tread Pattern Elements

2003 ◽  
Vol 31 (3) ◽  
pp. 132-158 ◽  
Author(s):  
R. E. Okonieski ◽  
D. J. Moseley ◽  
K. Y. Cai
Keyword(s):  
Development Process ◽  
Functional Design ◽  
Simplified Approach ◽  
Tire Industry ◽  
Geometric Stiffness ◽  
Stiffness Properties ◽  
Engineering Parameters ◽  
Net To Gross ◽  
Significant Effort

Abstract The influence of tread designs on tire performance is well known. The tire industry spends significant effort in the development process to create and refine tread patterns. Creating an aesthetic yet functional design requires characterization of the tread design using many engineering parameters such as stiffness, moments of inertia, principal angles, etc. The tread element stiffness is of particular interest because of its use to objectively determine differences between tread patterns as the designer refines the design to provide optimum levels of performance. The tread designer monitors the change in stiffness as the design evolves. Changes to the geometry involve many attributes including the number of sipes, sipe depth, sipe location, block element edge taper, nonskid depth, area net-to-gross, and so forth. In this paper, two different formulations for calculating tread element or block stiffness are reviewed and are compared to finite element results in a few cases. A few simple examples are shown demonstrating the basic functionality that is possible with a numerical method.

FLUVIAL ARCHITECTURE OF EXHUMED AND INVERTED PALEOCHANNELS OF THE EARLY CRETACEOUS CEDAR MOUNTAIN FORMATION OF EAST-CENTRAL UTAH

2019 ◽  
Author(s):  
Michael C. Wizevich ◽  
◽  
Isabelle Kisluk ◽  
Willow R. Reichard-Flynn ◽  
Abby Keebler ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
East Central ◽  
Cedar Mountain Formation ◽  
Fluvial Architecture

Changes in fluvial architecture induced by discharge variability, Jaicós Formation (Silurian-Devonian), Parnaíba Basin, Brazil

2021 ◽  
pp. 105924
Author(s):  
Monica Oliveira Manna ◽  
Claiton Marlon dos Santos Scherer ◽  
Manoela Bettarel Bállico ◽  
Adriano Domingos dos Reis ◽  
Lucas Vargas Moraes ◽  
...  
Keyword(s):  
Fluvial Architecture ◽  
Parnaíba Basin

Hydrogeological implications of paleo-fluvial architecture for the Paskapoo Formation, SW Alberta, Canada: a stochastic analysis

2010 ◽  
Vol 18 (6) ◽  
pp. 1375-1390 ◽  
Author(s):  
Erick R. Burns ◽  
Laurence R. Bentley ◽  
Masaki Hayashi ◽  
Stephen E. Grasby ◽  
Anthony P. Hamblin ◽  
...  
Keyword(s):  
Stochastic Analysis ◽  
Fluvial Architecture

Combined porosity, saturation and net‐to‐gross estimation from rock physics templates

2006 ◽  
Author(s):  
Per Avseth ◽  
Aart‐Jan van Wijngaarden ◽  
Gary Mavko ◽  
Tor Arne Johansen
Keyword(s):  
Rock Physics ◽  
Net To Gross

Joint time-variant spectral analysis — Part 1: Forward modeling the effects of thin-bed layering

2018 ◽  
Vol 6 (4) ◽  
pp. T967-T983
Author(s):  
Ramses G. Meza ◽  
J. Antonio Sierra ◽  
John P. Castagna ◽  
Umberto Barbato
Keyword(s):  
Seismic Data ◽  
Seismic Isolation ◽  
Forward Modeling ◽  
Destructive Interference ◽  
Constructive Interference ◽  
Phase Component ◽  
Time Frequency ◽  
Seismic Wavelet ◽  
Specific Frequency ◽  
Net To Gross

Using time-frequency and time-phase analysis we found that for an isolated thin bed in a binary-impedance setting, there is no observable sensitivity in preferential illumination as layered net-to-gross (NTG) changes within the isolated thin bed, regardless of the way the internal layering is distributed — either uniformly or semirandomly. The NTG signature is observed on the amplitude (magnitude) responses, rather than any specific frequency or phase component. On the other hand, external mutual thin-bed interference can significantly change the preferred phase component for each participating target. This phenomenon is largely driven by the embedded seismic wavelet that determines the nominal seismic response of an isolated thin layer and what phase component would preferentially illuminate it. For vertical separations between mutually interfering and elastically comparable thin beds in which mutual constructive interference is achieved, the target bed will be preferentially illuminated at a phase component that is very close to that of a total seismic isolation, whereas the occurrence of mutual destructive interference will cause a significant departure on the phase preferential illumination from that of an isolated seismic thin bed. All these observations can provide an avenue to yield more robust stratigraphic interpretations of seismic data and enhance the confidence on subsurface description.

Quantification of fluvial-peat interactions in the Pikeville formation Central Appalachian Basin, USA.

2021 ◽  
Author(s):  
Peter Wooldridge ◽  
Robert Duller ◽  
Rhodri Jerrett ◽  
Kyle Straub
Keyword(s):  
Accumulation Rate ◽  
Appalachian Basin ◽  
River Channels ◽  
Channel Depth ◽  
Peat Accumulation ◽  
Floodplain River ◽  
Basin Scale ◽  
Well Data ◽  
Fluvial Architecture ◽  
Sand Bodies

<p>Basin-scale fluvial architecture is, to a large extent, determined by the ability of river systems to migrate and avulse across their own floodplain. River avulsion takes place when a river aggrades by one channel depth to achieve super-elevation above the surrounding floodplain. However, peat enhancement of floodplain aggradation is likely to affect this fluvial behaviour and has received little attention. The interaction between river channels and peat-dominated floodplains is likely to have the effect of inhibiting or prolonging the conditions required for river avulsion, and so will impact on basin scale architecture during prolonged peat accumulation on floodplains. To elucidate and quantify the nature of this channel-floodplain interaction we investigate the coal-bearing clastic interval of the Carboniferous Pikeville Formation, Central Appalachian Basin, USA. Using a combination of well data and outcrop data, two coal horizons and intervening sand bodies, were mapped across an area of 5700 km<sup>2</sup> to ascertain overall basin-scale architecture. Comparison of the accumulation rate of the coal units (corrected for decompaction) with the synchronously deposited sand bodies suggests that extensive and rapid peat accumulation can increase avulsion timescales by 3 orders of magnitude and dramatically alter basin-scale fluvial architecture.</p>

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