--> --> Fault Zone Complexity: Impact on Seal Analysis and Prediction
[First Hit]

AAPG Annual Convention and Exhibition

Datapages, Inc.Print this page

Previous HitFaultNext Hit Zone Complexity: Impact on Seal Analysis and Prediction


The deformation complexity along a Previous HitfaultNext Hit length in cross-section may vary as a function of the mechanical properties of the stratigraphic section cut by the Previous HitfaultNext Hit. The array of minor structures that are often present within a damage zone around the principal Previous HitfaultNext Hit slip surface are generally at a sub-seismic scale that may impact flow resistance across the Previous HitfaultNext Hit. This presentation reports progress made on predicting the distribution and styles of Previous HitfaultNext Hit zone complexity from a combination of detailed, high resolution outcrop mapping and numerical modelling that includes consideration of the mechanical properties in the faulted stacking sequence. This integrated approach recognizes the different mechanical responses of lithological units and packages that define a vertical mechanical heterogeneity (VMH). The degree of heterogeneity influences the Previous HitfaultNext Hit zone complexity. Outcrop examples of Previous HitfaultNext Hit zone evolution are from a range of outcrops with differences in the facies and VMH. The observations support the model that much of the finite Previous HitfaultNext Hit zone architecture, seen in the hanging wall or footwall of seismic scale faults, is developed early during the throw history across premonitory shear zones that define the early Previous HitfaultNext Hit structure. By incorporating the expected VMH of the stratigraphic sequence at the time of deformation, we have generated and calibrated modelled Previous HitfaultNext Hit architectures and evolution against the detailed outcrop geometries. These models, using the Previous HitFaultNext Hit Modeller software, have successfully reproduced critical aspects of the observed Previous HitfaultNext Hit architectures, especially with respect to the location of more complex deformation domains along the Previous HitfaultNext Hit. For example, domains where minor faults concentrate, where local folding promotes more ductile deformation and areas more prone to Previous HitfaultNext Hit lens formation, can all be related to the mechanical stacking and heterogeneity present. The results provide a new platform for constraining and predicting the distribution of complexity in Previous HitfaultNext Hit zones and generating important input for assessing the impact of Previous HitfaultNext Hit zone architecture on cross Previous HitfaultNext Hit fluid flow behaviour. The input information used for the modelling is a depth log of lithologies and properties and defines a mechanical stratigraphy for the time of deformation. These Previous HitfaultTop zone architectures can be used to improve models of flow across the faults.