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geomechanical effects of CO_2 storage in depleted gas reservoirs in the Netherlands:Inferences from feasibility studies and comparison with aquifer storage

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第6期8卷 846-859页

作者： Bogdan Orlic TNO Energy Division

In this paper,the geomechanical impact of large-scale carbon dioxide(CO) storage in depleted Dutch gas fields is compared with the impact of COstorage in saline *** geomechanical behaviour of four potential COstorage sites is examined using flow and geomechanical *** gas reservoirs in the Netherlands are found in fault blocks,one to a few kilometres wide,laterally bounded by sealing *** depletion or re-pressurization in the lateral direction is seldom an issue because of a lack of active *** pressure changes are therefore limited to a gas-bearing fault block,while the induced stress changes affect the gas reservoir and extend 1-3 km away into the surrounding *** in favour of COstorage in depleted gas fields are:proven seal quality,availability of field data,no record of seal integrity failure by fault reactivation from the seismically active producing Dutch gas fields,and the potential benefits of restoring the virgin formation pressure and stress state to geomechanical *** the other hand,COinjection in saline aquifers causes pressure build-up that exceeds the virgin hydrostatic *** perturbations resulting from pressure build-up affect large areas,extending tens of kilometres away from the injection *** stresses in top seals ***,small and do not exceed a few tenths of megapascal for a pressure build-up of a few megapascals in the storage *** effects on top seals are weak,but could be enhanced close to the injection zone by the thermal effects of *** related to characterisation of large areas affected by pressure build-up are significant,and seal quality and continuity are more difficult to be demonstrated for aquifers than for depleted gas reservoirs that have held hydrocarbons for millions of years.

关键词： Carbon dioxide(CO_2) injection CO_2 storage Geomechanics of CO_2 storage geomechanical modelling

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