Facies- to sandbody-scale heterogeneity in a tight-gas fluvial reservoir analog: Blackhawk Formation, Wasatch Plateau, Utah, USA

Sahoo, Hiranya; Gani, M. Royhan; Hampson, Gary J.; Gani, Nahid D.; Ranson, Andrew

doi:10.1016/j.marpetgeo.2016.02.005

Cited by 22 publications

(7 citation statements)

References 43 publications

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“…Arndorfer, ; O'Brien and Wells, ; Smith et al ., ; van Gelder et al ., ; Bristow et al ., ; Farrell, ; Tooth, ; Cahoon et al ., ; Li and Bristow, ; Shen et al ., ; Joeckel et al ., ; Millard et al ., ) and examples of ancient deposits in outcrop (e.g. Platt and Keller, ; Mjøs et al ., ; Hornung and Aigner, ; Anderson, ; Fisher et al ., ; Hampton and Horton, ; Jones and Hajek, ; Nichols and Fisher, ; Ghazi and Mountney, ; Pranter et al ., ; Ford and Pyles, ; Gulliford et al ., ; Sahoo et al ., ; Van Toorenenburg et al ., ; Burns et al ., ) or in the subsurface (e.g. Pranter et al ., ; McKie, ; Keeton et al ., ).…”

Section: Introductionmentioning

confidence: 99%

The life cycle of crevasse splays as a key mechanism in the aggradation of alluvial ridges and river avulsion

Toorenenburg

Donselaar

Weltje

2018

Earth Surf Processes Landf

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Accommodation space in the unconfined distal part of low‐gradient fluvial fans facilitates abundant floodplain deposition. Here, the development of crevasse splays plays a key role in the aggradation of alluvial ridges and subsequent river avulsion. This study presents an analysis of different stages in the evolution of crevasse splays based on observations made in the modern‐day Río Colorado dryland fluvial fan fringing the endorheic Altiplano Basin in Bolivia. A generic life cycle is proposed in which crevasse‐splay channels adjust towards a graded equilibrium profile with their lower‐lying distal termini acting as a local base level. Initial development is dominantly controlled by the outflow of floodwater, promoting erosion near the crevasse apex and deposition towards the splay fringes. When proximal incision advances to below the maximum level of floodplain inundation, return flow occurs during the waning stage of flooding. This floodwater reflux leads to a temporary repositioning of the local base level to the deeper trunk‐channel thalweg at the apex of the crevasse‐splay channels. The resultant decrease in the floodplainward gradient of these channels ultimately leads to backfilling and abandonment of the crevasse splay, leaving a subtle local elevation of the floodplain. Consecutive splays form an alluvial ridge through lateral amalgamation and subsequent vertical stacking, which is mirrored by the aggradation of their parent channel floor. As this alluvial ridge becomes increasingly perched above the surrounding floodplain, splay equilibration may cause incision of the levee crevasse down to or below its trunk channel thalweg, leading to an avulsion. The mechanisms proposed in this study are relevant to fluvial settings promoting progradational avulsions. The relatively rapid accumulation rate and high preservation potential of crevasse splays in this setting makes them an important constituent of the resultant fluvial stratigraphy, amongst which are hydrocarbon‐bearing successions. Copyright © 2018 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

The life cycle of crevasse splays as a key mechanism in the aggradation of alluvial ridges and river avulsion

Toorenenburg

Donselaar

Weltje

2018

Earth Surf Processes Landf

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“…Due to the lack of stable embankment, a plain fluvial system is prone to frequent channel migration and extensive contiguous channel sandbodies will be deposited (Allen, 1983;Burns, Mountney, Hodgson, & Colombera, 2017;Davies, Holdaway, & Fanning, 2016;Gugliotta, Saito, Ben, Sieng, & Oliver, 2018;Miall, 1977Miall, , 1994. The heterogeneity of plain fluvial sandstones reservoir is quite strong because of its complex vertical and lateral facies relationships and sandbody geometries (Miall, 1988;Pranter, Ellison, Cole, & Patterson, 2007;Sahoo, Gani, Hampsonc, Gani, & Ranson, 2016). The reservoir may change within tens of metres; however, the average well spacing in the Kongdian Oilfield exceeded 200 m, and there is great uncertainty in reservoir prediction and description only by wellbore data.…”

Section: Introductionmentioning

confidence: 99%

Application of seismic sedimentology in a fluvial reservoir: A case study of the Guantao Formation in Dagang Oilfield, Bohai Bay Basin, China

2021

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A seismic sedimentology study was performed to analyse the complex fluvial reservoirs in the Neogene Guantao Formation in Kongdian Oilfield, Huanghua Depression.Three facies associations were identified by core and logging data, including bedload channel, mixload channel, and floodplain. Widely developed floodplain deposits beds were selected as the relatively reliable reference time surfaces. Stratal slices were generated applying the stratal-slicing principle on two isochronous reference seismic events in Kongdian Oilfield. These stratal slices were used to analyse the distribution of sediments in a relative geologic-time domain. The variety of sediment distribution observed on the stratal slices indicated that the fluvial channel systems of study interval had evolved from straight channel, sandy-braided channel to combined channel. Sediment dispersal patterns were controlled by the change of accommodation (A) and sediment supply (S) rate. Setting with a low A/S ratio favours the development of fluvial environment and high A/S ratio favours the development of floodplain. Braided channel sandstones formed in a low A/S ratio depositional environment were generally thought to be excellent reservoirs. However, the muddy plug could damage the lateral continuity of sandbody, impede the fluid flow, and reduce the water-injection efficiency.

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“…Reservoir heterogeneity is a relative concept, and the degree of heterogeneity changes depending on the variation of the study object (Martinius et al, 2017). According to different scales of reservoir heterogeneity, the research objects can be divided into the scales of lithofacies combination, microfacies, lithofacies, and microscopic heterogeneity, which can be recognized by macro-heterogeneity, meso-heterogeneity, and micro-heterogeneity (Huang et al, 2017;Qiao et al, 2016;Sahoo, Gani, Hampson, Gani, & Ranson, 2016). Reservoir heterogeneity is an important factor that affects the fluid flow and remaining oil distribution in the reservoir (Chen, Song, & Li, 2012;Wardlaw & Cassan, 1979;Weber, 1982Weber, , 1986, and studying reservoir heterogeneity during reservoir development is important (Song et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Microscopic heterogeneity and distribution characteristics of reservoirs controlled by a sequence framework: A case study of the Donghe sandstone reservoir in the Tarim Basin, SW China

Zhao

Yin

2021

Geological Journal

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In this article, abundant coring analysis results from underground reservoirs were used to understand the characteristics of reservoir micro‐heterogeneity within a sequence stratigraphic framework, primarily including the distribution of reservoir particles, fillings, and pore‐throat heterogeneities. The vertical distribution pattern of the reservoir micro‐heterogeneity is then summarized, and the controlling effect of the sequence frameworks at different levels on the micro‐heterogeneity distribution is discussed. Generally, the micro‐heterogeneity within the quasi‐sequence decreases from bottom to top, which is characterized by coarsening grain size, increasing quartz content, decreasing feldspar, debris, clay mineral, and calcareous cement content. The pore volume and throat radius and pore–throat connectivity have also been better with weakening secondary pore development and permeability anisotropies. Differences are observed in the micro‐heterogeneity distribution between the retrograde quasi‐sequence group and the progradational quasi‐sequence group. The micro‐heterogeneity vertical distribution in the retrograde quasi‐sequence group shows one set of characteristics from bottom to top, in which the grain size becomes finer, the calcareous precipitation degree increases, and the micro‐heterogeneity of the reservoir generally shows enhanced trend upward; however, the micro‐heterogeneity vertical distribution in the progradational quasi‐sequence group shows the opposite characteristics. The micro‐heterogeneity of the reservoirs in the system tract also shows some regularity. The sea level in the high system tract has risen and fallen several times and shows a relative fallen trend overall, and the micro‐heterogeneity weakens while progressing upward. Reservoir micro‐heterogeneity variations in the sequence framework are of great significance for determining reservoir quality and performing predictions during oil and gas exploration and development.

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Facies- to sandbody-scale heterogeneity in a tight-gas fluvial reservoir analog: Blackhawk Formation, Wasatch Plateau, Utah, USA

Cited by 22 publications

References 43 publications

The life cycle of crevasse splays as a key mechanism in the aggradation of alluvial ridges and river avulsion

The life cycle of crevasse splays as a key mechanism in the aggradation of alluvial ridges and river avulsion

Application of seismic sedimentology in a fluvial reservoir: A case study of the Guantao Formation in Dagang Oilfield, Bohai Bay Basin, China

Microscopic heterogeneity and distribution characteristics of reservoirs controlled by a sequence framework: A case study of the Donghe sandstone reservoir in the Tarim Basin, SW China

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