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• W1528583564 abstract "Seal analysis is an important aspect of prospect evaluation, as it severely impact the prediction of hydrocarbon column heights. Seal failure is suggested to frequently result from leakage of pore fluids through faults or fractures originating from perturbations of the rock stress. In-depth knowledge of rock stress and the rocks' responses to stress changes through time should thus be included in seal evaluation. However, analyses of the complete set of interactions between stress history and leakage of hydrocarbon accumulations have apparently not been reported. Analysis of the stress state of wells in the Norwegian North Sea, supported by public domain information, was carried out as an effort to compile such information. It was realized that the vertical (S v ) and least horizontal (S h ) stress components could typically be determined within 5–10% accuracy. Determination of the largest horizontal stress (S h ) is less well constrained, and opinions differ significantly regarding the accuracy of calculated S h values. The processes which influence rock stress and the rocks' responses to stress perturbations seem to be well known in principle. Quantification of these processes are however scarce, a.o. due to inaccurate knowledge of the parameters which control rocks' mechanical behavior over geologic time. As elevated temperatures can lead to diagenesis and porosity reduction, even in the presence of fluid overpressures, clastic reservoirs most often leak during subsidence. The critical factor in seal evaluation under such conditions is thus to identify the weakest spot in the pressure compartment. The location of this spot largely depends on the stress state (and lithology variations and juxtapositions across faults), and can often be identified even without accurate knowledge of the stress history. Analysis of hydrocarbon occurrence in overpressured reservoirs in the Norwegian North Sea demonstrates that fatal leakage of hydrocarbons frequently takes place from downflanks positions, often leaving hydrocarbon volumes updip. This observation suggests that shear failure and not hydrofracturing controls leakage here, and therefore that faults with certain orientations relative to the stress field are most likely to be leakage avenues." @default.
• W1528583564 created "2016-06-24" @default.
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• W1528583564 date "2002-01-01" @default.
• W1528583564 modified "2023-09-26" @default.
• W1528583564 title "Rock stress in sedimentary basins — implications for trap integrity" @default.
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• W1528583564 doi "https://doi.org/10.1016/s0928-8937(02)80004-2" @default.
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