Layered fluvial reservoirs with internal fluid cross flow: a well-connected family of well test pressure transient responses

Corbett, Patrick William Michael; Hamdi, Hamidreza; Gurav, Hemant

doi:10.1144/1354-079311-008

Cited by 31 publications

(13 citation statements)

References 26 publications

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“…In these environments, the depletion and the lateral cross-flow between the laterally avulsing point bar deposits separated by the semi-permeable channel fills can effectively create a compartmentalized system (Hamdi, 2014;Hamdi et al, 2014). Corbett et al (2012) present an interesting well-test response in a meandering channelized system, where numerical well-test simulations and a multi-point statistics approach support the analytical well-test interpretation and the existence of effective sand bar compartments. Malavazos and McDonough (1991) demonstrate another channelized reservoir example where there is communication between the stacked channel compartments.…”

Section: Introductionmentioning

confidence: 65%

A Novel Method for Performance Analysis of Compartmentalized Reservoirs

Shahamat¹,

Hamdi

Mattar³

et al. 2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-This paper presents a simple analytical model for performance analysis of compartmentalized reservoirs producing under Constant Terminal Rate (CTR) and Constant Terminal Pressure (CTP). The model is based on the well-known material balance and boundary dominated flow equations and is written in terms of capacitance and resistance of a production and a support compartment. These capacitance and resistance terms account for a combination of reservoir parameters which enable the developed model to be used for characterizing such systems. In addition to considering the properties contrast between the two reservoir compartments, the model takes into account existence of transmissibility barriers with the use of resistance terms.The model is used to analyze production performance of unconventional reservoirs, where the multistage fracturing of horizontal wells effectively creates a Stimulated Reservoir Volume (SRV) with an enhanced permeability surrounded by a non-stimulated region. It can also be used for analysis of compartmentalized conventional reservoirs. The analytical solutions provide type curves through which the controlling reservoirs parameters of a compartmentalized system can be estimated. The contribution of the supporting compartment is modeled based on a boundary dominated flow assumption. The transient behaviour of the support compartment is captured by application of "distance of investigation" concept. The model shows that depletion of the production and support compartments exhibit two unit slopes on a log-log plot of pressure versus time for CTR. For CTP, however, the depletions display two exponential declines. The depletion signatures are separated by transition periods, which depend on the contribution of the support compartment ( i.e. transient or boundary dominated flow).The developed equations can be implemented easily in a spreadsheet application, and are corroborated with the use of a numerical simulation. The study provides a new and nonconventional insight into the use of production data as an aid in the understanding of hydraulically fractured tight formations and compartmentalized conventional reservoirs.

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Section: Introductionmentioning

confidence: 65%

A Novel Method for Performance Analysis of Compartmentalized Reservoirs

Shahamat¹,

Hamdi

Mattar³

et al. 2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…Assessing and predicting lithological complexity in the fill of rift basins is important for two principal reasons: (a) it enables models to be developed whereby the sedimentary record can be used to reconstruct histories of basin evolution and to help assess the impacts of tectonic control on sedimentation, (b) from an applied standpoint, the deposits of fluvial successions in rift basins form major oil and gas reservoirs (Corbett, Hamdi, & Gurav, 2012;Hamdi, Ruelland, Bergey, & Corbett, 2014;Medici, West, & Mountney, 2018b), serve as important groundwater aquifers (Lockwood, 2001;Medici, West, & Mountney, 2016;Tellam & Barker, 2006), and act as potential sites for long-term carbon sequestration (Bachu, 2000) and for the underground storage of radioactive waste (Bath et al, 2006;Medici, West, & Mountney, 2018a). Point-bar deposits of meandering rivers are of particular importance in applied geology due to their economic potential as major hydrocarbon reservoirs (Jolley, Fisher, & Ainsworth, 2010;Larue & Hovadik, 2006).…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional forward stratigraphic modelling of the sedimentary architecture of meandering‐river successions in evolving half‐graben rift basins

2019

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The spatial organisation of meandering-river deposits varies greatly within the sedimentary fills of rift basins, depending on how differential rates of fault propagation and subsidence interplay with autogenic processes to drive changes in fluvial channel-belt position and rate of migration, avulsion frequency and mechanisms of meander-bend cut off. This set of processes fundamentally influences stacking patterns of the accumulated successions. Quantitative predictions of the spatio-temporal evolution and internal architecture of meandering fluvial deposits in such tectonically active settings remain limited. A numerical forward stratigraphic model-the Point-Bar Sedimentary Architecture Numerical Deduction (PB-SAND)-is applied to examine relationships between differential rates of subsidence and resultant fluvial channel-belt migration, reach avulsion and channel-deposit stacking in active, faultbounded half-grabens. The model is used to reconstruct and predict the complex morphodynamics of fluvial meanders, their generated channel belts, and the associated lithofacies distributions that accumulate as heterogeneous fluvial successions in rift settings, constrained by data from seismic images and outcrop successions.The 3D modelling outputs are used to explore sedimentary heterogeneity at various spatio-temporal scales. Results show how the connectivity of sand-prone geobodies can be quantified as a function of subsidence rate, which itself decreases both along and away from the basin-bounding fault. In particular, results highlight the spatial variability in the size and connectedness of sand-prone geobodies that is seen in directions perpendicular and parallel to the basin axis, and that arises as a function of the interaction between spatial and temporal variations in rates of accommodation generation and fault-influenced changes in river morphodynamics. The results have applied significance, for example, to both hydrocarbon exploration and assessment of groundwater aquifers. The expected greatest connectivity of fluvial sandbody in a half-graben is primarily determined by the complex interplay between the frequency and rate of subsidence, the style of basin propagation, the rates of migration of channel belts, the frequency of avulsion and the proportion and spatial distribution of variably sand-prone channel and bar deposits.How to cite this article: Yan N, Colombera L, Mountney NP. Three-dimensional forward stratigraphic modelling of the sedimentary architecture of meandering-river successions in evolving half-graben rift basins. Basin Res.

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“…Several petrohydraulic studies conducted on sandstone lithotypes (including fluvial deposits) have been undertaken on successions at depths ≥ 1,000 m using data from hydrocarbon extraction fields (e.g., Baas et al 2007;Corbett et al 2012;Zheng et al 2000). However, multi-disciplinary studies that investigate the hydraulic properties of fluvial aquifers (and sandstone aquifers more generally) at different scales are lacking for successions at depths of investigation of 150-1,100 m BGL.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a fluvial aquifer at a range of depths and scales: the Triassic St Bees Sandstone Formation, Cumbria, UK

2017

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Fluvial sedimentary successions represent porous media that host groundwater and geothermal resources. Additionally, they overlie crystalline rocks hosting nuclear waste repositories in rift settings. The permeability characteristics of an arenaceous fluvial succession, the Triassic St Bees Sandstone Formation in England (UK), are described, from core-plug to well-test scale up to~1 km depth. Within such lithified successions, dissolution associated with the circulation of meteoric water results in increased permeability (K~10 −1 -10 0 m/day) to depths of at least 150 m below ground level (BGL) in aquifer systems that are subject to rapid groundwater circulation. Thus, contaminant transport is likely to occur at relatively high rates. In a deeper investigation (> 150 m depth), where the aquifer has not been subjected to rapid groundwater circulation, well-test-scale hydraulic conductivity is lower, decreasing from K~10 −2 m/day at 150-400 m BGL to 10 −3 m/day down-dip at~1 km BGL, where the pore fluid is hypersaline. Here, pore-scale permeability becomes progressively dominant with increasing lithostatic load. Notably, this work investigates a sandstone aquifer of fluvial origin at investigation depths consistent with highly enthalpy geothermal reservoirs (~0.7-1.1 km). At such depths, intergranular flow dominates in unfaulted areas with only minor contribution by bedding plane fractures. However, extensional faults represent preferential flow pathways, due to presence of high connective open fractures. Therefore, such faults may (1) drive nuclear waste contaminants towards the highly permeable shallow (< 150 m BGL) zone of the aquifer, and (2) influence fluid recovery in geothermal fields.

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Layered fluvial reservoirs with internal fluid cross flow: a well-connected family of well test pressure transient responses

Cited by 31 publications

References 26 publications

A Novel Method for Performance Analysis of Compartmentalized Reservoirs

A Novel Method for Performance Analysis of Compartmentalized Reservoirs

Three‐dimensional forward stratigraphic modelling of the sedimentary architecture of meandering‐river successions in evolving half‐graben rift basins

Characterization of a fluvial aquifer at a range of depths and scales: the Triassic St Bees Sandstone Formation, Cumbria, UK

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