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Pore Pressure and Stress around Dipping Structures
We employ laws of poro-elasticity (Modified Cam Clay) to predict the stresses and pore pressures around inclined hydrocarbon reservoirs (e.g., dipping structures). We show that, at the crest, the localized flow field increases the horizontal and vertical stresses above the lithostatic value. Therefore, very high least principal stresses, even greater than the overburden value, are possible around the shallower end of dipping structures. At the deeper end of such structures, the local flow field loads the surrounding sediments, leading to elastoplastic strains and notable increase in porosity. We show that both the vertical and the horizontal total stresses decrease locally near the base. Traditional basin modeling approaches assume a horizontal-to-vertical stress ratio, so they cannot fully capture the stress changes around dipping structures. We illustrate that poromechanical analyses are essential to predict changes in pore pressure and the associated stress changes, especially in the vertical direction. The poromechanical results can significantly increase confidence in the trap integrity of inclined hydrocarbon reservoirs and provide a more reliable evaluation of borehole stability.
Pore Pressure and Stress around Dipping Structures
We employ laws of poro-elasticity (Modified Cam Clay) to predict the stresses and pore pressures around inclined hydrocarbon reservoirs (e.g., dipping structures). We show that, at the crest, the localized flow field increases the horizontal and vertical stresses above the lithostatic value. Therefore, very high least principal stresses, even greater than the overburden value, are possible around the shallower end of dipping structures. At the deeper end of such structures, the local flow field loads the surrounding sediments, leading to elastoplastic strains and notable increase in porosity. We show that both the vertical and the horizontal total stresses decrease locally near the base. Traditional basin modeling approaches assume a horizontal-to-vertical stress ratio, so they cannot fully capture the stress changes around dipping structures. We illustrate that poromechanical analyses are essential to predict changes in pore pressure and the associated stress changes, especially in the vertical direction. The poromechanical results can significantly increase confidence in the trap integrity of inclined hydrocarbon reservoirs and provide a more reliable evaluation of borehole stability.
Pore Pressure and Stress around Dipping Structures
Nikolinakou, Maria A. (Autor:in) / Flemings, Peter B. (Autor:in)
Fifth Biot Conference on Poromechanics ; 2013 ; Vienna, Austria
Poromechanics V ; 452-461
18.06.2013
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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