Seismic geomorphology linked to sequence stratigraphy of an Eocene delta in the Outer Moray Firth, UKCS

E. H. Zimmer (Corresponding Author), J. A. Howell, N. Schofield, R. L. Gawthorpe

Research output: Contribution to journalArticle

Abstract

The Halibut Delta is a newly described, Lower Eocene delta in the Outer Moray Firth which has been studied in the shallow (<1 s TWT) section of conventional seismic data as an analogue for more deeply buried systems that are potential hydrocarbon reservoirs. The key internal reflectors have been mapped and geomorphological measurements such as clinoform dip, shoreline trajectory, clinothem width and length were taken at multiple sections along strike and dip. These were combined with seismic attribute analysis to characterize the delta and understand the controls on the observed geometries. Grainsize has been inferred using cuttings descriptions from 20 wells that penetrate the interval. The Halibut Delta was divided into three units: a lowermost clay rich unit with a low median clinoform dip of 1.4° and a uniform thickness is overlain by a more sand rich portion with steeply dipping clinoforms (median values 2.0°–4.7°) and a descending, regressive accretionary shoreline trajectory. The upper unit of the delta shows a transgressive accretionary shoreline trajectory with clinoform dips of 3.5°–1.7° and a sandy character. All three units show along strike variation in clinoform dip and lithology with areas of high clinoform dip corresponding to coarser grained lithology that occur at the location of fluvial feeder channels which introduced coarse, immature material to the delta. Towards the edges of the clinothem this material is reworked and redistributed through wave action and longshore transport. The three units of the Halibut Delta represent a succession of transgressive, regressive and transgressive systems tract, the development of which was mainly influenced by eustatic sea level changes. Seen as a reservoir analogue, the clinothems of the Halibut Delta have a short down-dip extent and are divided by mud-draped layers that could baffle fluid flow. In down-dip direction well spacing would have to be below 2 km to ensure production and/or injection takes place within one clinothem and this short down-dip continuity has to be taken into account when correlating clinothems between wells.

Original languageEnglish
Pages (from-to)150-167
Number of pages18
JournalMarine and Petroleum Geology
Volume104
Early online date20 Mar 2019
DOIs
Publication statusPublished - 1 Jun 2019

Fingerprint

geomorphology
stratigraphy
sequence stratigraphy
dip
Eocene
shorelines
shoreline
lithology
trajectories
trajectory
analogs
longshore transport
feeders
baffles
well
mud
sea level
dipping
hydrocarbon reservoir
systems tract

Keywords

  • Clinoform dip
  • Eocene
  • Moray firth
  • Seismic attribute
  • Seismic geomorphology
  • Shelf edge
  • Shoreline trajectory
  • Wave-dominated delta

ASJC Scopus subject areas

  • Oceanography
  • Geophysics
  • Geology
  • Economic Geology
  • Stratigraphy

Cite this

Seismic geomorphology linked to sequence stratigraphy of an Eocene delta in the Outer Moray Firth, UKCS. / Zimmer, E. H. (Corresponding Author); Howell, J. A.; Schofield, N.; Gawthorpe, R. L.

In: Marine and Petroleum Geology, Vol. 104, 01.06.2019, p. 150-167.

Research output: Contribution to journalArticle

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note = "This work was undertaken as part of the SAFARI project in a collaboration between the University of Aberdeen, United Kingdom and UniCIPR in Bergen, Norway. SAFARI is sponsored by 16 oil companies, the Norwegian Petroleum Directorate and the Norwegian Research Council. Details at www.safaridb.com. PGS generously provided the seismic data for this case study. We would like to thank the associate editor F. J. Lobo as well as the reviewers G. Hampson and C. Olariu for critically reviewing the manuscript and offering constructive advice leading to significant improvement of both text and figures.",
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N2 - The Halibut Delta is a newly described, Lower Eocene delta in the Outer Moray Firth which has been studied in the shallow (<1 s TWT) section of conventional seismic data as an analogue for more deeply buried systems that are potential hydrocarbon reservoirs. The key internal reflectors have been mapped and geomorphological measurements such as clinoform dip, shoreline trajectory, clinothem width and length were taken at multiple sections along strike and dip. These were combined with seismic attribute analysis to characterize the delta and understand the controls on the observed geometries. Grainsize has been inferred using cuttings descriptions from 20 wells that penetrate the interval. The Halibut Delta was divided into three units: a lowermost clay rich unit with a low median clinoform dip of 1.4° and a uniform thickness is overlain by a more sand rich portion with steeply dipping clinoforms (median values 2.0°–4.7°) and a descending, regressive accretionary shoreline trajectory. The upper unit of the delta shows a transgressive accretionary shoreline trajectory with clinoform dips of 3.5°–1.7° and a sandy character. All three units show along strike variation in clinoform dip and lithology with areas of high clinoform dip corresponding to coarser grained lithology that occur at the location of fluvial feeder channels which introduced coarse, immature material to the delta. Towards the edges of the clinothem this material is reworked and redistributed through wave action and longshore transport. The three units of the Halibut Delta represent a succession of transgressive, regressive and transgressive systems tract, the development of which was mainly influenced by eustatic sea level changes. Seen as a reservoir analogue, the clinothems of the Halibut Delta have a short down-dip extent and are divided by mud-draped layers that could baffle fluid flow. In down-dip direction well spacing would have to be below 2 km to ensure production and/or injection takes place within one clinothem and this short down-dip continuity has to be taken into account when correlating clinothems between wells.

AB - The Halibut Delta is a newly described, Lower Eocene delta in the Outer Moray Firth which has been studied in the shallow (<1 s TWT) section of conventional seismic data as an analogue for more deeply buried systems that are potential hydrocarbon reservoirs. The key internal reflectors have been mapped and geomorphological measurements such as clinoform dip, shoreline trajectory, clinothem width and length were taken at multiple sections along strike and dip. These were combined with seismic attribute analysis to characterize the delta and understand the controls on the observed geometries. Grainsize has been inferred using cuttings descriptions from 20 wells that penetrate the interval. The Halibut Delta was divided into three units: a lowermost clay rich unit with a low median clinoform dip of 1.4° and a uniform thickness is overlain by a more sand rich portion with steeply dipping clinoforms (median values 2.0°–4.7°) and a descending, regressive accretionary shoreline trajectory. The upper unit of the delta shows a transgressive accretionary shoreline trajectory with clinoform dips of 3.5°–1.7° and a sandy character. All three units show along strike variation in clinoform dip and lithology with areas of high clinoform dip corresponding to coarser grained lithology that occur at the location of fluvial feeder channels which introduced coarse, immature material to the delta. Towards the edges of the clinothem this material is reworked and redistributed through wave action and longshore transport. The three units of the Halibut Delta represent a succession of transgressive, regressive and transgressive systems tract, the development of which was mainly influenced by eustatic sea level changes. Seen as a reservoir analogue, the clinothems of the Halibut Delta have a short down-dip extent and are divided by mud-draped layers that could baffle fluid flow. In down-dip direction well spacing would have to be below 2 km to ensure production and/or injection takes place within one clinothem and this short down-dip continuity has to be taken into account when correlating clinothems between wells.

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