Theoretical analysis of cross joint geometries and their classification

Bai, T.

doi:10.25148/etd.fi14050407

Cited by 2 publications

(2 citation statements)

References 33 publications

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“…Thoroughly studied by several authors (e.g. Hodgson, 1961;Hanckock, 1985;Bai and Gross, 1999;Fabbri et al, 2001;Bai et al, 2002) the cross-joints are smaller, abut against the systematic joints and may develop at different angles to them, although for each geological context the angle between cross-joints and systematic joints has a small dispersion. Two mechanisms have been proposed for the formation of one main joint set bounding a secondary one oriented at a high angle.…”

Section: The Role Of Tectonics and The Trigger Mechanismmentioning

confidence: 99%

Formation, deformation and chertification of systematic clastic dykes in a differentially lithified carbonate multilayer. SW Iberia, Algarve Basin, Lower Jurassic

Ribeiro

Terrinha

2007

Sedimentary Geology

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Section: The Role Of Tectonics and The Trigger Mechanismmentioning

confidence: 99%

Formation, deformation and chertification of systematic clastic dykes in a differentially lithified carbonate multilayer. SW Iberia, Algarve Basin, Lower Jurassic

Ribeiro

Terrinha

2007

Sedimentary Geology

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“…Orthogonal joints perpendicular to bedding constitute one of the most common patterns of joints found on superficial outcrops of sedimentary rocks and occur in many oil reservoirs and aquifer in sedimentary terrain. Abutting and crosscutting relationships as well as markedly differing joint orientations seem to imply that the two sets formed neither at the same time nor under the same stress conditions (Bai and Gross, 1999). In our model, we consider that the second set of fractures is younger than the first set.…”

Section: Three Dimensional Fracture Network Modelmentioning

confidence: 99%

Flow behavior in a dual fracture network

Jourde

Cornaton

Pistre

et al. 2002

Journal of Hydrology

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A model that incorporates a pseudo-random process controlled by mechanical rules of fracturing is used to generate 3D orthogonal joint networks in tabular stratified aquifers. The results presented here assume that two sets of fractures, each with different conductivities, coexist. This is the case in many aquifers or petroleum reservoirs that contain sets of fractures with distinct hydraulic properties related to each direction of fracturing. Constant rate pump-tests from partially penetrating wells are simulated in synthetic networks. The transient head response is analyzed using the type curve approach and plots, as a function of time, of pressure propagation in the synthetic network are shown. The hydrodynamic response can result in a pressure transient that is similar to a dual-porosity behavior, even though such an assumption was not made a priori. We show in this paper that this dual porosity like flow behavior is, in fact, related to the major role of the network connectivity, especially around the well, and to the aperture contrast between the different families of fractures that especially affects the earlier hydrodynamic response. Flow characteristics that may be interpreted as a dual porosity flow behavior are thus related to a lateral heterogeneity (large fracture or small fault). Accordingly, when a dual porosity model matches well test data, the resulting reservoir parameters can be erroneous because of the model assumptions basis that are not necessarily verified. Finally, it is shown both on simulated data and well test data that such confusion in the interpretation of the flow behavior can easily occur. Well test data from a single well must therefore be used cautiously to assess the flow properties of fractured reservoirs with lateral heterogeneities such as large fractures or small faults.

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Theoretical analysis of cross joint geometries and their classification

Cited by 2 publications

References 33 publications

Formation, deformation and chertification of systematic clastic dykes in a differentially lithified carbonate multilayer. SW Iberia, Algarve Basin, Lower Jurassic

Formation, deformation and chertification of systematic clastic dykes in a differentially lithified carbonate multilayer. SW Iberia, Algarve Basin, Lower Jurassic

Flow behavior in a dual fracture network

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