Fault seal behaviour in Permian Rotliegend reservoir sequences

case studies from the Dutch Southern North Sea

K. van Ojik, A. Silvius, Y. Kremer, Z. K. Shipton

Research output: Contribution to journalArticle

Abstract

Permian Rotliegend reservoir rocks are generally characterised by high N/G ratios, and faults in such sand-dominated lithologies are typically not considered likely to seal. Nevertheless many examples of membrane sealing are present in Rotliegend gas fields in the Southern Permian Basin. This manuscript reviews examples of membrane sealing in the Dutch Rotliegend, it presents a dataset of petrophysical properties of Rotliegend fault rocks, and analyses two case studies using commonly used workflows. From the field studies it is concluded that observable small AFPDs are present and that these are likely pre-production AFPDs due to exploration-time scale trapping and retention of hydrocarbons. It is concluded SGR-based tools may predict AFPD for Upper Rotliegend lower N/G reservoir rocks with reasonable results. Nonetheless the core sample data sets show a much wider range of permeability and capillary entry pressure than predicted by the SGR transforms. This highlights the potential to modify existing workflows for application to faults in high N/G lithologies and the need for more data. Data sharing and collaboration between industry and academics is encouraged, so that in the long run workflows can be developed specifically for faults in high N/G lithologies.
Original languageEnglish
JournalGeological Society Special Publications
Publication statusAccepted/In press - 4 Sep 2019

Fingerprint

Lithology
Seals
Permian
Rocks
lithology
reservoir rock
sealing
Membranes
Core samples
membrane
capillary pressure
Sand
Hydrocarbons
gas field
trapping
transform
permeability
hydrocarbon
timescale
Gases

Keywords

  • Permian Rotliegend reservoir
  • fault seal behaviour
  • membrane sealing
  • case study
  • across fault pressure differences

Cite this

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title = "Fault seal behaviour in Permian Rotliegend reservoir sequences: case studies from the Dutch Southern North Sea",
abstract = "Permian Rotliegend reservoir rocks are generally characterised by high N/G ratios, and faults in such sand-dominated lithologies are typically not considered likely to seal. Nevertheless many examples of membrane sealing are present in Rotliegend gas fields in the Southern Permian Basin. This manuscript reviews examples of membrane sealing in the Dutch Rotliegend, it presents a dataset of petrophysical properties of Rotliegend fault rocks, and analyses two case studies using commonly used workflows. From the field studies it is concluded that observable small AFPDs are present and that these are likely pre-production AFPDs due to exploration-time scale trapping and retention of hydrocarbons. It is concluded SGR-based tools may predict AFPD for Upper Rotliegend lower N/G reservoir rocks with reasonable results. Nonetheless the core sample data sets show a much wider range of permeability and capillary entry pressure than predicted by the SGR transforms. This highlights the potential to modify existing workflows for application to faults in high N/G lithologies and the need for more data. Data sharing and collaboration between industry and academics is encouraged, so that in the long run workflows can be developed specifically for faults in high N/G lithologies.",
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N2 - Permian Rotliegend reservoir rocks are generally characterised by high N/G ratios, and faults in such sand-dominated lithologies are typically not considered likely to seal. Nevertheless many examples of membrane sealing are present in Rotliegend gas fields in the Southern Permian Basin. This manuscript reviews examples of membrane sealing in the Dutch Rotliegend, it presents a dataset of petrophysical properties of Rotliegend fault rocks, and analyses two case studies using commonly used workflows. From the field studies it is concluded that observable small AFPDs are present and that these are likely pre-production AFPDs due to exploration-time scale trapping and retention of hydrocarbons. It is concluded SGR-based tools may predict AFPD for Upper Rotliegend lower N/G reservoir rocks with reasonable results. Nonetheless the core sample data sets show a much wider range of permeability and capillary entry pressure than predicted by the SGR transforms. This highlights the potential to modify existing workflows for application to faults in high N/G lithologies and the need for more data. Data sharing and collaboration between industry and academics is encouraged, so that in the long run workflows can be developed specifically for faults in high N/G lithologies.

AB - Permian Rotliegend reservoir rocks are generally characterised by high N/G ratios, and faults in such sand-dominated lithologies are typically not considered likely to seal. Nevertheless many examples of membrane sealing are present in Rotliegend gas fields in the Southern Permian Basin. This manuscript reviews examples of membrane sealing in the Dutch Rotliegend, it presents a dataset of petrophysical properties of Rotliegend fault rocks, and analyses two case studies using commonly used workflows. From the field studies it is concluded that observable small AFPDs are present and that these are likely pre-production AFPDs due to exploration-time scale trapping and retention of hydrocarbons. It is concluded SGR-based tools may predict AFPD for Upper Rotliegend lower N/G reservoir rocks with reasonable results. Nonetheless the core sample data sets show a much wider range of permeability and capillary entry pressure than predicted by the SGR transforms. This highlights the potential to modify existing workflows for application to faults in high N/G lithologies and the need for more data. Data sharing and collaboration between industry and academics is encouraged, so that in the long run workflows can be developed specifically for faults in high N/G lithologies.

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