Reservoir Architecture in Recent and Subsurface, Deepwater Meandri-Channel and Related Depositional Forms

Kolla, V.; Bourges, P.; Urruty, J.-M.; Claude, D.; Morice, M.; Durand, E.; Kenyon, N. H.

doi:10.3997/2214-4609.201406585

Cited by 6 publications

(3 citation statements)

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“…Stelting et al, 1985;Kastens and Shor, 1986;Kolla and Coumes, 1987;McHargue, 1991;Damuth et al, 1995;Peakall et al, 2000) but is not seen in fluvial sinuous channels. The advent of 3D seismic data in recent years has aided identification and mapping of sinuous channels in the subsurface, and revealed internal architecture and temporal evolution of deep-water sinuous channels with greater clarity than was possible with 2D seismic in prior studies (Roberts and Compani, 1996;Kolla et al, 1998Kolla et al, , 2001Peakall et al, 2000;Mayall and O'Byrne, 2002;Abreu et al, 2003;Deptuck et al, 2003;Posamentier and Kolla, 2003;Samuel et al, 2003). These recent studies suggest that deep-water sinuous channels evolved similar to fluvial channels in some cases, and in more variable and complex ways in many others.…”

Section: Introductionmentioning

confidence: 85%

Deep-water and fluvial sinuous channels—Characteristics, similarities and dissimilarities, and modes of formation

Kolla

Posamentier

Wood

2007

Marine and Petroleum Geology

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108

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Section: Introductionmentioning

confidence: 85%

Deep-water and fluvial sinuous channels—Characteristics, similarities and dissimilarities, and modes of formation

Kolla

Posamentier

Wood

2007

Marine and Petroleum Geology

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168

108

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“…Recently, however, three-dimensional seismic images of buried aggradational submarine channels have suggested that in some cases the channels appear spontaneously with high-amplitude meanders. The channel then aggrades upward without showing sufficient evidence of bend migration (Kolla et al 1998). An example of the planform of such a channel is shown in figure 5.…”

Section: 2mentioning

confidence: 99%

A nonlinear model of flow in meandering submarine and subaerial channels

Imran¹,

1999

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A generalized model of flow in meandering subaqueous and subaerial channels is developed. The conservation equations of mass and momentum are depth/layer integrated, normalized, and represented as deviations from a straight base state. This allows the determination of integrable forms which can be solved at both linear and nonlinear levels. The effects of various flow and geometric parameters on the flow dynamics are studied. Although the model is not limited to any specific planform, this study focuses on sine-generated curves. In analysing the flow patterns, the turbidity current of the subaqueous case is simplified to a conservative density flow with water entrainment from above neglected. The subaqueous model thus formally corresponds to a subcritical or only mildly supercritical mud-rich turbidity current. By extension, however the analysis can be applied to a depositional or erosional current carrying sand that is changing only slowly in the streamwise direction. By bringing the subaqueous and subaerial cases into a common form, flow behaviour in the two environments can be compared under similar geometric and boundary conditions. A major difference between the two cases is the degree of superelevation of channel flow around bends, which is modest in the subaerial case but substantial in the subaqueous case. Another difference concerns Coriolis effects: some of the largest subaqueous meandering systems are so large that Coriolis effects can become important. The model is applied to meander bends on the youngest channel in the mid-fan region of the Amazon Fan and a mildly sinuous bend of the North-West Atlantic Mid-Ocean Channel. In the absence of specific data on the turbid flows that created the channel, the model can be used to make inferences about the flow, and in particular the range of values of flow velocity and sediment concentration that would allow the growth and downfan migration of meander bends.

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“…This situation is changing quickly, and given the use of better and improved three-dimensional (3-D) seismic technologies and ever-increasing deep-water exploration in offshore areas, the highly sinuous channel forms in the subsurface Tertiary of offshore west Africa and Gulf of Mexico are now proven to be viable exploration targets (Roberts and Compani, 1996;Stephens et al, 1996). The sinuous channels encountered in the subsurface off west Africa range from simple to complex forms resulting from a few to numerous laterally and vertically stacked depositional events (Kolla et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Evolution of deep-water Tertiary sinuous channels offshore Angola (west Africa) and implications for reservoir architecture

Kolla¹,

Bourges

Urruty

et al. 2001

Bulletin

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A B S T R A C TSimple to complex, highly sinuous deep-water channels are common in the subsurface Tertiary off Angola, west Africa, and have been important exploration targets there in recent years. We discuss in this article three examples of these sinuous channels that are generally characterized by high-amplitude seismic reflection events, resulting from reservoir-prone lithologies. The planform characteristics of these channels-sinuosities and sinuous loop wavelengthsare similar to those of the fluvial channels; however, the planform combined with sectional seismic characteristics of the deep-water channels suggest that high sinuosities generally evolved through repeated channel aggradation and lateral migration. In detail, the influence of lateral migration vs. vertical aggradation in the evolution of the deep-water channel sinuosities varies from one channel to another and even along the length of a single channel or across a single sinuous loop. The lateral migrations may be continuous or discrete, separated in distance, and resolvable in seismic. Along some parts of the channels, very high initial sinuosities, not significantly affected by lateral migration, suggest that the initial sea-floor topography and gradients were a major factor in their development. In such cases, the channels essentially aggraded vertically. Thus, the modes of deep-water channel migration and sinuosity evolution are complex and different from those of fluvial channels that exhibit largely lateral (without much aggradational component) shifts within a meander loop. These differences are the result of unique hydrodynamic characteristics of the currents in these systems. The gross reservoir shapes in both the fluvial and deep-water channels are obviously dictated by their high sinuosities. The degree of lateral migration vs. vertical aggradation, however, determines the details of the lateral extent vs. vertical stacking of reservoir lithologies and their connectivities in deep-water sinuous channels. A fluvial,

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Reservoir Architecture in Recent and Subsurface, Deepwater Meandri-Channel and Related Depositional Forms

Cited by 6 publications

References 0 publications

Deep-water and fluvial sinuous channels—Characteristics, similarities and dissimilarities, and modes of formation

Deep-water and fluvial sinuous channels—Characteristics, similarities and dissimilarities, and modes of formation

A nonlinear model of flow in meandering submarine and subaerial channels

Evolution of deep-water Tertiary sinuous channels offshore Angola (west Africa) and implications for reservoir architecture

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