3D Predrill Pore Pressure Prediction Using Basin Modeling Approach in a Field of Malay Basin

Satti, Iftikhar Ahmed; Ghosh, Deva Prasad; Yusoff, Wan Ismail Wan

doi:10.3923/ajes.2015.24.31

Cited by 8 publications

(4 citation statements)

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“…Overpressure is defined as the excess pressure above hydrostatic pore pressure given by a vertical depth, the formation water's density and the Earth's gravitational acceleration. Overpressure or pore pressure in general can be estimated from data sources such as geophysical well logs (Bowers 1995;Eaton 1972Eaton , 1975, seismic velocities derived from vertical seismic profiles, seismic surveys or sonic logs (Bowers 1995;Eaton 1972Eaton , 1975, drilling parameters (Mouchet and Mitchell 1989) and basin modeling (Bjørlykke et al 2010;Darby et al 1998;Karlsen and Skeie 2006;Mosca et al 2018;Mudford et al 1991;Peters et al 2017;Satti et al 2015). Origins of overpressure include disequilibrium compaction through retarded dewatering of pore fluids due to low-permeability barriers in the context of high sedimentation rates (Osborne and Swarbrick 1997;Swarbrick and Osborne 1998), fluid expansion through increased temperatures (Osborne and Swarbrick 1997;Swarbrick and Osborne 1998) or an increase in pore water caused by diagenesis (temperature) related hydroxide loss of clays (Osborne and Swarbrick 1997;Sargent et al 2015;Swarbrick and Osborne 1998).…”

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Predictability and controlling factors of overpressure in the North Alpine Foreland Basin, SE Germany: an interdisciplinary post-drill analysis of the Geretsried GEN-1 deep geothermal well

et al. 2019

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For the first time, drilling-and velocity-based well analysis and 3D basin modeling were combined to test the predictability and controlling factors of overpressure in the North Alpine Foreland Basin in SE Germany. More specifically, the techniques were tested in the sub-regional context of the deep geothermal well Geretsried GEN-1 (TVD = 4852 m), located in the south of Munich. A 3D basin model based on a total of 20 wells was calibrated to the pressure distribution of four petroleum wells and tested against the Geretsried GEN-1 well. The results demonstrate that overpressure in the North Alpine Foreland Basin SE Germany can be predicted from a simple 3D basin model calibrated to a minimum number of wells. Thereby, disequilibrium compaction likely acts as the main overpressure mechanism in the study area, underpinned by significantly higher sedimentation rates at overpressured locations. 3D basin modeling also confirms the role of Upper Cretaceous shales, which, if present, serve as an important pressure barrier between the under-to normally pressured Jurassic and overpressured Cenozoic basin fill. In addition, overpressure magnitudes of the Chattian might be higher than previously expected. The results of this study have great impact on future drilling campaigns in the North Alpine Foreland Basin in SE Germany. Minimized non-productive time and drilling cost, improved well planning and increased safety are amongst the most important benefits of accurate pore pressure and overpressure prediction. The newly derived insights on the mechanisms of overpressure will greatly influence future geomechanical and tectonic studies, since pore pressure drives rock strength and principle stress magnitudes. Finally, the study is a great example for the importance of an interdisciplinary approach and the incorporation of geological conditions, when investigating drilling-related problems. Open Access© The Author(s) 2019. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creat iveco mmons .org/licen ses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Predictability and controlling factors of overpressure in the North Alpine Foreland Basin, SE Germany: an interdisciplinary post-drill analysis of the Geretsried GEN-1 deep geothermal well

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Overpressure is defined as the excess pressure above hydrostatic pore pressure given by a vertical depth, the formation water's density and the Earth's gravitational acceleration. Overpressure or pore pressure in general can be estimated from data sources such as geophysical well logs (Bowers 1995;Eaton 1975Eaton , 1972, seismic velocities derived from vertical seismic profiles, seismic surveys or sonic logs (Bowers 1995;Eaton 1975Eaton , 1972, drilling parameters (Mouchet and Mitchell 1989) and basin modeling (Bjørlykke et al 2010;Darby et al 1998;Karlsen and Skeie 2006;Mosca et al 2018;Mudford et al 1991;Peters et al 2017;Satti et al 2015). Origins of overpressure include disequilibrium compaction through retarded dewatering of pore fluids due to low permeability barriers in the context of high sedimentation rates (Osborne and Swarbrick 1997;Swarbrick and Osborne 1998) and volume changes due to diagenesis and/or fluid expansion at higher temperatures (Osborne and Swarbrick 1997;Sargent et al 2015;Swarbrick and Osborne 1998).…”

Section: Introductionmentioning

confidence: 99%

Predictability and controlling factors of overpressure in the North Alpine Foreland Basin, SE Germany: an interdisciplinary post-drill analysis of the Geretsried GEN-1 deep geothermal well

et al. 2020

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The North Alpine Foreland Basin in SE Germany is Germany's most active deep geothermal province. However, in its southern and eastern part the basin is considerably overpressured, which is a significant challenge for drilling deep geothermal wells. In this study, we combine drilling data and velocity-based pore pressure analyses with 3D basin modeling to assess the predictability and controlling factors of overpressure in the sub-regional context (area of 80 km × 50 km) around the Geretsried GEN-1 well, a deep geothermal exploration well in the southern part of the North Alpine Foreland Basin in SE Germany. Drilling data and velocity-based pore pressure analyses indicate overpressure maxima in the Lower Oligocene (Rupelian and Schoeneck Formation) and up to mild overpressure in the Upper Oligocene (Chattian) and Upper Cretaceous, except for the hydrostatically pressured northwestern part of the study area. 3D basin modeling calibrated to four hydrocarbon wells surrounding the Geretsried GEN-1 well demonstrates the dominating role of disequilibrium compaction and low permeability units related to overpressure generation in the North Alpine Foreland Basin. However, secondary overpressure generation mechanisms are likely contributing. Also, the impact of Upper Cretaceous shales, which are eroded in the northwestern part of the study area, on overpressure maintenance is investigated. The calibrated basin model is tested against the drilling history and velocity (VSP) data-based pore pressure estimate of the Geretsried GEN-1 well and reveals that pore pressure prediction is generally possible using 3D basin modeling in the North Alpine Foreland Basin, but should be improved with more detailed analysis of lateral drainage systems and facies variations in the future. The results of the study are of relevance to future well planning and drilling as well as to geomechanical modeling of subsurface stresses and deep geothermal production in the North Alpine Foreland Basin.

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“…Overpressure is defined as the excess pressure above hydrostatic pore pressure given by a vertical depth, the formation water's density and the Earth's gravitational acceleration. Overpressure or pore pressure in general can be estimated from data sources such as geophysical well logs (Bowers 1995;Eaton 1975Eaton , 1972, seismic velocities derived from vertical seismic profiles, seismic surveys or sonic logs (Bowers 1995;Eaton 1975Eaton , 1972, drilling parameters (Mouchet and Mitchell 1989) and basin modelling (Bjørlykke et al 2010;Darby et al 1998;Karlsen and Skeie 2006;Mosca et al 2018;Mudford et al 1991;Peters et al 2017;Satti et al 2015). Origins of overpressure include disequilibrium compaction through retarded dewatering of pore fluids due to low permeability barriers in the context of high sedimentation rates (Osborne and Swarbrick 1997;Swarbrick and Osborne 1998) and volume changes due diagenesis and/or fluid expansion at higher temperatures (Osborne and Swarbrick 1997;Sargent et al 2015;Swarbrick and Osborne 1998).…”

Section: Introductionmentioning

confidence: 99%

Predictability and controlling factors of overpressure in the North Alpine Foreland Basin, SE Germany: An interdisciplinary post-drill analysis of the Geretsried GEN-1 Deep Geothermal Well

Drews

Hofstetter

Zoßeder

et al. 2020

Preprint

View full text Add to dashboard Cite

Drilling- and velocity-based well analyses and 3D basin modelling were combined to test the predictability and controlling factors of overpressure in the North Alpine Foreland Basin in SE Germany. More specifically, the techniques were tested in the sub-regional context of the deep geothermal well Geretsried GEN-1 (TVD = 4852 m), located in the south of Munich. A 3D basin model based on a total of 20 wells was calibrated to the pressure distribution of four petroleum wells and tested against the Geretsried GEN-1 well. The results demonstrate that overpressure in the North Alpine Foreland Basin in SE Germany can be predicted from a simple 3D basin model calibrated to a minimum number of wells. Thereby, disequilibrium compaction likely acts as the main overpressure mechanism in the study area, underpinned by significantly higher sedimentation rates at overpressured locations. 3D basin modelling also confirms the role of Upper Cretaceous shales, which, if present, serve as an important pressure barrier between the under- to normally pressured Jurassic and overpressured Cenozoic basin fill. In addition, overpressure magnitudes of the Chattian might be higher than previously expected. The results of this study have great impact on future drilling campaigns in the North Alpine Foreland Basin in SE Germany. Minimized non-productive time and drilling cost, improved well planning and increased safety are amongst the most important benefits of accurate pore pressure and overpressure prediction. The newly derived insights on the mechanisms of overpressure will greatly influence future geomechanical and tectonic studies, since pore pressure is driving rock strength and principal stress magnitudes. Finally, the study is a great example for the importance of an interdisciplinary approach and the incorporation of geological conditions, when investigating drilling-related problems.

show abstract

3D Predrill Pore Pressure Prediction Using Basin Modeling Approach in a Field of Malay Basin

Cited by 8 publications

References 2 publications

RETRACTED ARTICLE: Predictability and controlling factors of overpressure in the North Alpine Foreland Basin, SE Germany: an interdisciplinary post-drill analysis of the Geretsried GEN-1 deep geothermal well

RETRACTED ARTICLE: Predictability and controlling factors of overpressure in the North Alpine Foreland Basin, SE Germany: an interdisciplinary post-drill analysis of the Geretsried GEN-1 deep geothermal well

Predictability and controlling factors of overpressure in the North Alpine Foreland Basin, SE Germany: an interdisciplinary post-drill analysis of the Geretsried GEN-1 deep geothermal well

Predictability and controlling factors of overpressure in the North Alpine Foreland Basin, SE Germany: An interdisciplinary post-drill analysis of the Geretsried GEN-1 Deep Geothermal Well

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