The Gullfaks Field: Geology and Reservoir Development

Petterson, Ole; Storli, Arvid; Ljosland, Eva; Massie, I.

doi:10.1007/978-94-009-0791-1_4

Cited by 22 publications

(10 citation statements)

References 2 publications

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“…The Gullfaks Field (Petterson et al 1990) is situated east of the Statfjord Field and south of the Snorre Field ( Fig. 1), and has been under production since 1986.…”

Section: The Gullfaks Fieldmentioning

confidence: 99%

Structural geology of the Gullfaks Field, northern North Sea

Fossen

Hesthammer

1998

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The large amount of structural data available from the Gullfaks Field have been used to unravel the structural characteristics of the area. Two structurally distinct subareas have been revealed (a major domino system and an eastern horst complex) that show significant differences with respect to fault geometry, rotation and internal block deformation. The main faults have very low dips in the domino system (25 30 ° ) as compared to the horst complex (65°), whereas most minor faults are steep in all parts of the field. Forward modelling indicates that the horst complex balances with rigid block operations. However, the domino area underwent significant internal deformation, reflected by the low acute angle between bedding and faults, and by non-planar bedding geometries. The internal deformation is modelled as a shear synthetic to, but steeper than, the main domino faults. This deformation explains a large-scale (kilometre sized) drag zone that has a triangular geometry in cross-section. Much of this shear deformation occurred by strain-dependent grain reorganization in the poorly consolidated Jurassic sediments, which led to a decrease in porosity. A strain map is presented for the domino area, indicating where the porosity is likely to have been decreased due to internal shear. Hangingwalls are generally more deformed (sheared) than footwalls. This is seen on both the kilometre scale (large-scale drag) and the metre scale (local drag).

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“…The Gullfaks Field (Petterson et al 1990) is situated east of the Statfjord Field and south of the Snorre Field ( Fig. 1), and has been under production since 1986.…”

Section: The Gullfaks Fieldmentioning

confidence: 99%

Structural geology of the Gullfaks Field, northern North Sea

Fossen

Hesthammer

1998

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“…Rannoch, Etive and Ness formations have been interpreted as a wave-dominated delta while the Tarbert Formation in the Upper Brent, has been interpreted as a fluvial/tide-dominated delta (Pettersen et al 1990). Figure 5 shows log-log plots of the oil saturation versus inverse time since water breakthrough for each of the four formations including estimated trend lines.…”

Section: Field Measurementsmentioning

confidence: 98%

Relationship between remaining oil saturation after waterflooding and rock/flow properties at laboratory and reservoir scale

Maldal

Jakobsen²,

Alvestad³

et al. 1999

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The dependency of waterflood remaining oil saturation (S or ) on intial water saturation (S wi ), wettability and flow rate has been studied in the laboratory at core scale. For both water-wet and mixed-wet cores, S or was found to be inversely proportional to S wi . For mixed-wet cores, S or was also found to be inversely proportional to the number of pore volumes injected. In contrast, water-wet cores showed a dependency between S or and flow rate, indicating that pore structure plays an important role.The oil saturation development in several waterflooded intervals in the Gullfaks Field has been monitored, mainly by saturation logs, over several years. Oil saturation was found to decrease inversely with time after water breakthrough. Also, an oil saturation distribution with depth, which seems to depend on the balance between capillary and gravitational forces, was found.

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“…3) as well as adjacent fields in the British sector. The sedimentology of this interval is well documented (Røe & Steel 1985;Petterson et al 1989;Dalland et al 1995;Ryseth 2001) and its stratigraphic development is also well documented but still debated. Most recently the well-established stratigraphic hierarchy of the Statfjord Group was elevated from Formation status to Group status with the three members (Raude, Eiriksson and Nansen) being elevated to Formation status (Lervik 2006).…”

Section: Statfjord Group Gullfaks Sørmentioning

confidence: 99%

Data capture for multiscale modelling of the Lourinhã Formation, Lusitanian Basin, Portugal: an outcrop analogue for the Statfjord Group, Norwegian North Sea

Keogh¹,

Leary²,

Martinius³

et al. 2014

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Current recovery from the Statfjord Group in the majority of the fields on the Tampen Spur is less than 50%. A contributing factor to this is an incomplete understanding of multiscale heterogeneities, their distributions within a range of fluvial geobodies and their lateral extent and morphology in inter-well areas. Sedimentary heterogeneities have been modelled, together with petrophysical parameters, at a variety of scales. The modelled properties at a given scale were upscaled to the next level of heterogeneity, thus better honouring effective property values. The use of outcrop analogues is still a key tool for understanding facies relationships and the stratigraphic development of subsurface hydrocarbon-bearing reservoirs. The Lourinhã Formation, Portugal, was used as an analogue to collect both qualitative and quantitative data consistently following a three-phase workflow to capture data at various scales of heterogeneity. Traditional field data collection techniques have been supplemented with the collection of LiDAR data. A digital workflow utilizing interlinked datasets facilitates rapid data analysis and better data visualization with results that are more easily utilized in multiscale modelling studies. These scaled models were used to increase our understanding of the effect on flow of lithofacies and facies association distributions together with internal architectural elements and heterogeneities.

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The Gullfaks Field: Geology and Reservoir Development

Cited by 22 publications

References 2 publications

Structural geology of the Gullfaks Field, northern North Sea

Structural geology of the Gullfaks Field, northern North Sea

Relationship between remaining oil saturation after waterflooding and rock/flow properties at laboratory and reservoir scale

Data capture for multiscale modelling of the Lourinhã Formation, Lusitanian Basin, Portugal: an outcrop analogue for the Statfjord Group, Norwegian North Sea

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