Searched for: author%3A%22Fokker%2C+P.A.%22
(1 - 20 of 71)

Pages

document
Candela, T.G.G. (author), Chitu, A.G. (author), Peters, E. (author), Pluymaekers, M.P.D. (author), Hegen, D. (author), Koster, K. (author), Fokker, P.A. (author)
Surface movement can be induced by many human subsurface activities: production of natural gas, geothermal heat extraction, ground water extraction, phreatic groundwater level lowering, storage of natural gas and CO2. In this manuscript, we focus on subsidence caused by gas production. While geological interpretations, seismic campaigns and flow...
article 2022
document
Singh, A. (author), Fokker, P.A. (author)
This work is an extension of the time-resolved poro-elasto-plastic MohrCoulomb model by Fokker et al to include a more realistic constitutive model. Experiments on Slochteren sandstone revealed that the inelastic deformation contributes significantly in compressive deformation almost in all stages of loading and instigated the development of a...
article 2021
document
Wassing, B.B.T. (author), Gan, Q. (author), Candela, T. (author), Fokker, P.A. (author)
Enhanced Geothermal Systems (EGS) involve hydraulic stimulation of the permeability of deep low-permeable rock formations. This causes the reactivation and opening of pre-existing natural fracture networks and the formation of new fractures. During hydraulic stimulation, injection pressures at the bottom of the injection well can reach...
article 2021
document
Wassing, B.B.T. (author), Candela, T.G.G. (author), Osinga, S. (author), Peters, E. (author), Buijze, L. (author), Fokker, P.A. (author), van Wees, J.D.A.M. (author)
This paper describes and deploys a workflow to assess the evolution of seismicity associated to injection of cold fluids close to a fault. We employ a coupled numerical thermo-hydro-mechanical simulator to simulate the evolution of pressures, temperatures and stress on the fault. Adopting rate-and-state seismicity theory we assess induced...
article 2021
document
Fokker, P.A. (author), Borello, E.S. (author), Viberti, D. (author), Verga, F. (author), van Wees, J.D. (author)
Seasonal storage of heat in shallow aquifers for increasing the efficiency of geothermal energy systems requires a proper monitoring strategy. We expanded our earlier work on harmonic pulse testing (HPT) to incorporate the effect of a temperature front moving into the reservoir due to injection of hot (or cold) water. Our analytical solutions...
article 2021
document
Post, R.A.J. (author), Michels, M.A.J. (author), Ampuero, J.P. (author), Candela, T. (author), Fokker, P.A. (author), van Wees, J.D. (author), van der Hofstad, R.W. (author), van den Heuvel, E.R. (author)
The initial footprint of an earthquake can be extended considerably by triggering of clustered aftershocks. Such earthquake–earthquake interactions have been studied extensively for data-rich, stationary natural seismicity. Induced seismicity, however, is intrinsically inhomogeneous in time and space and may have a limited catalog of events;...
article 2021
document
Bekesi, E. (author), Fokker, P.A. (author), Martins, J.E. (author), Norini, G. (author), van Wees, J.-D. (author)
We investigate ground movements induced by the 8 February 2016, Mw=4.2 earthquake at the Los Humeros Geothermal Field (Mexico) using Sentinel-1 radar interferometry. Previous estimated focal mechanism solution based on seismic data with a hypocentral depth of 1900 m could not resolve the measured coseismic surface deformation pattern. In this...
article 2021
document
Buijze, L. (author), Fokker, P.A. (author), Wassing, B.B.T. (author)
The Dutch National Climate Agreement sets the goal to adapt before 2030 1.5 million homes which are now heated by natural gas, into buildings heated by sustainable heat. To this end, a growth of the use of sustainable heat sources needs to be realized. Geothermal energy is considered an important future heat source, with an expected supply of 15...
report 2021
document
Nwanwe, C.C. (author), Fokker, P.A. (author)
Reservoir simulations are performed with fine grid geological models as primary input into the reservoir simulators. These fine grid geological models contain ten million to one hundred million cells while current serial reservoir simulators can only handle one hundred thousand to one million cells. This disparity in scales prohibits direct...
article 2020
document
Fokker, P.A. (author), Singh, A. (author), Wassing, B.B.T. (author)
Wellbore stability problems and stimulation operations call for models helping in understanding the subsurface behaviour and optimizing engineering performance. We present a fast, iteratively coupled model for the flow and mechanical behaviour that employs a time-sequential approach. Updates of pore pressure are calculated in a timestepping...
article 2020
document
Fokker, P.A. (author)
The Netherlands is subsiding faster than the sea level is rising. In large parts of the Netherlands, human intervention is causing increased subsidence, in part because of a reduction in groundwater levels. The Geological Survey of the Netherlands (GDN), part of TNO, investigates all aspects of subsidence in collaboration with other institutes....
other 2020
document
Bekesi, E. (author), Struijk, M. (author), Bonte, D. (author), Veldkamp, J.G. (author), Limburger, J. (author), Fokker, P.A. (author), Vrijlandt, M.A.W. (author), van Wees, J.D. (author)
The subsurface temperature is one of the most crucial parameters for the development of geothermal energy. Physics-based temperature models calibrated with temperature data are especially relevant for deep geothermal exploration. We present an updated high-resolution 3D thermal model of the onshore Netherlands. We constructed the model in 7...
article 2020
document
van Daalen, T.M. (author), Fokker, P.A. (author), Bogaard, P.J.F. (author), van der Meulen, M.J. (author)
Geological surveys traditionally assess past and present processes in the subsurface, focusing mainly on exploration and extraction of natural resources. Applications like these determined how geological surveys designed and operated their information services. In recent years, information needs are rapidly evolving in conjunction with emerging...
conference paper 2020
document
Kroon, I.C. (author), Fokker, P.A. (author), Breunese, J.N. (author)
The proper management of subsidence hazards requires a procedure to formulate thresholds and measurement & control loops. Such a formulation should be adequate in terms of technical hazard and hazard perception, unambiguous, in plain language and preferably complying with national or international standards. The technical nature of subsidence...
conference paper 2020
document
Stouthamer, E. (author), Erkens, G. (author), Cohen, K. (author), Hegger, D. (author), Driessen, P. (author), Weikard, H.P. (author), Hefting, M. (author), Hanssen, R. (author), Fokker, P.A. (author), van den Akker, J. (author), Groothuijse, F. (author), van Rijswick, M. (author)
t. In the Netherlands land subsidence is a continuously ongoing process. Consequently, an increasing number of people and economic assets are exposed to subsidence, damage costs are soaring, and flood risk and greenhouse gas emissions are increasing. In some areas tipping points have already been reached, where current land-use can no longer be...
conference paper 2020
document
Candela, T.G.G. (author), Koster, K. (author), Stafleu, J. (author), Visser, W. (author), Fokker, P.A. (author)
The Netherlands is subject to anthropogenically induced deep-source and shallow subsidence. Deep sources are related to the extraction of hydrocarbons or salt mining activities, whereas shallow subsidence comprise compaction, shrinkage and oxidation of clay and peat under progressive lowering groundwater levels. At TNO – Geological Survey of the...
conference paper 2020
document
Fokker, P.A. (author), Erkens, G. (author)
The surface of the earth is constantly in motion. The lowering of the earth surface over time is called land subsidence. Land subsidence is a local phenomenon on a global scale and is often problematic in the context of human societies. Much of the problematic land subsidence is humaninduced, with major causes being the extraction or mining of...
article 2020
document
Candela, T.G.G. (author), Osinga, S. (author), Ampuero, J.P. (author), Wassing, B.B.T. (author), Pluymaekers, M.P.D. (author), Fokker, P.A. (author), Wees, J.D.A.M. (author), de Waal, H.A. (author), Muntendam-Bos, A.G. (author)
We implement a Coulomb rate‐and‐state approach to explore the nonlinear relation between stressing rate and seismicity rate in the Groningen gas field. Coulomb stress rates are calculated, taking into account the 3‐D structural complexity of the field and including the poroelastic effect of the differential compaction due to fault offsets. The...
article 2019
document
Borello, E.S. (author), Fokker, P.A. (author), Viberti, D. (author), Verga, F. (author), Hofmann, H. (author), Meier, P. (author), Min, K.B. (author), Yoon, K. (author), Zimmermann, G. (author)
Harmonic Pulse Testing (HPT) has been developed as a type of well testing applicable during ongoing field operations because a pulsed signal is superimposed on background pressure trend. Its purpose is to determine well and formation parameters such as wellbore storage, skin, permeability, and boundaries within the investigated volume. Compared...
article 2019
document
Fokker, P.A. (author), Gunnink, J.L. (author), Koster, K. (author), de Lange, G. (author)
The natural surface area of many coastal and delta plains has been increased by land reclamation in response to growing populations. These reclaimed lands are often experiencing subsidence. The reclaimed South Flevopolder in the coastal plain of the Netherlands has experienced severe subsidence after its reclamation in 1968. The subsidence is...
article 2019
Searched for: author%3A%22Fokker%2C+P.A.%22
(1 - 20 of 71)

Pages