Abstract
The Triassic fluvial sandstones of the Skagerrak Formation were deposited in a series of salt-walled mini-basins and act as important hydrocarbon reservoirs for several high-pressure, high-temperature (HPHT) fields in the Central Graben, North Sea. The HPHT reservoirs exhibit excellent reservoir quality considering their depth of burial and hence have been of high interest for hydrocarbon exploration. This research uses a multidisciplinary approach to assess the Skagerrak Formation fluvial reservoir quality from the Seagull field incorporating core analysis, petrography, electron microscopy, XRD analysis, fluid inclusion appraisal and burial history modelling. Halokinesis and salt withdrawal at the margin of the salt-walled mini-basin induced early disaggregation bands and fractures at shallow burial and led to increased influx of meteoric water and clay mineral infiltration from overlying sedimentation. The density of disaggregation bands correlates with the occurrence and magnitude of pore-filling authigenic clay minerals, concentrated along the margin of the salt-walled mini-basin. The fluvial channel sandstones of the Skagerrak Formation are subject to strong intra-basinal spatial reservoir quality variations despite diagenesis and low vertical effective stress having played a favourable role in arresting porosity loss.
Highlights
The eventual quality of clastic reservoirs, such as grain size, sorting and composition, is initially determined by the environment of deposition
The Triassic fluvial sandstones of the Skagerrak Formation were deposited in a series of salt-walled mini-basins and act as important hydrocarbon reservoirs for several high-pressure, high-temperature (HPHT) fields in the Central Graben, North Sea
The fluvial channel sandstones of the Skagerrak Formation are subject to strong intra-basinal spatial reservoir quality variations despite diagenesis and low vertical effective stress having played a favourable role in arresting porosity loss
Summary
The eventual quality of clastic reservoirs, such as grain size, sorting and composition, is initially determined by the environment of deposition Depositional settings and their effects on reservoir quality are of particular interest for clastic reservoirs, where contemporaneous salt movement influences sedimentation and the resulting distribution of facies Hudec and Jackson 2007; Archer et al 2012; Hudec et al 2013; Sathar and Jones 2016) Such studies have increased our understanding of salt movement, the development of salt-walled mini-basins and on the effects of coeval halokinesis on sedimentary. How the salt-walled mini-basin setting controls reservoir quality in the fluvial sandstones of Triassic Skagerrak Formation, Central North Sea, UK and:. How contemporaneous salt movement influences fracturing, clay infiltration and diagenesis to guide prediction of best reservoir quality in salt-walled mini-basins
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