Leakage from deep reservoirs: possible mechanisms and relationship to shallow gas in the Haltenbanken area, mid-Norwegian Shelf

Vik, Eilen Arctander; Heum, O. R.; Amaliksen, K. G.

doi:10.1144/gsl.sp.1991.059.01.18

Cited by 6 publications

(4 citation statements)

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“…The main reservoir units are the Middle Jurassic Ile and Garn sandstone formations, which are subjected to high pressure and high temperature (HPHT) conditions. The general stratigraphic and structural development was discussed by [2,3,4,6,7,9,11,16,19,27]. The lithostratigraphic column in the region is shown in Fig 2. The stratigraphic nomenclature used in this paper is also in accordance with the terminology for the Halten Terrace area published by [6].…”

Section: Geological Settingmentioning

confidence: 99%

Forward modeling of paleo heat flow: a case study of Kristin Field, Mid-Norwegian continental shelf

Unnithan

2009

Oceans 2009-Europe

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Temperature and paleo heat flow are critical of understanding of hydrocarbon plays in the Norwegian margin. The Kristin Field located on the Mid-Norwegian continental shelf is selected to construct a 3D thermal history model. The rift evolution of the Kristin Field and corresponding paleo heat flow have been modeled with forward modeling approach in our study. Based on the simulation of crustal thinning and tectonic subsidence, the average stretching factor 1.5 for crust and 2.5 for mantle were obtained in our study area. The crustal heat flow variations at different rift phases are presented by 1D extraction from the 3D model at well locations. The heat flow trend starts from 57 mW/m2 during the pre-rifting phase, increases to 83 mW/m2 at the end of Jurassic rifting phase and decays to 53 mW/m2 as a stationary state from 24 Ma to present. The modeled heat flow values are in agreement with published data in the vicinities of Halten Terrace. In particular, our study highlighted the thermal conditions for depth level below the reach of boreholes and provided useful information in determining source rock maturation and hydrocarbon generation history in the Halten Terrace area.

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Section: Geological Settingmentioning

confidence: 99%

Forward modeling of paleo heat flow: a case study of Kristin Field, Mid-Norwegian continental shelf

Unnithan

2009

Oceans 2009-Europe

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“…Vertical hydrocarbon migration, probably initiated as a result of overpressure (Vik et al 1992) and focused by faults and microfracture systems, may be considered a proven model in the NE Atlantic. All North Sea Paleocene and Cretaceous fields known to the authors contain Jurassic-sourced oil (e.g.…”

Section: Charging From Deeply Buried Sourcementioning

confidence: 99%

The NE Atlantic margin; implications of late Mesozoic and Cenozoic events for hydrocarbon prospectivity

Doré¹,

Lundin²,

Birkeland³

et al. 1997

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The study takes in the entire NE Atlantic margin (NEAM) but emphasizes the sparsely drilled Møre and Vøring Basins. A network of PermoTriassic and Jurassic basins was strongly overprinted by younger extensional episodes. At least three phases are probable -early Cretaceous, mid-Cretaceous and latest Cretaceous-early Eocene -between the late Jurassic and break-up. Substantial thicknesses of Cretaceous and Cenozoic strata along the margin have focused exploration interest on the late Cretaceous and Paleocene intervals as easily drillable targets. Reservoirs within these intervals were deposited as gravity-driven sand incursions into an overwhelmingly mud-prone environment. Sand pulses of AlbianConiacian, Santonian-early Campanian and Paleocene age occur widely, and can be tied to the tectonic episodes. Vertical migration of hydrocarbons from known Jurassic source rocks is proven west of Shetlands, but in many parts of the margin remigration from intermediate reservoirs would be required to charge the shallower plays. Failing this, prospectivity will hinge on the presence of frontier source rocks, with best possibilities at Barremian, Aptian-Albian, Cenomanian-Turonian and Paleocene levels. Potential hydrocarbon traps were formed by pre-breakup extensional faulting and by post-breakup compression.

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“…The early work by Mann and Mackenzie (1990) attributed the presence of overpressure in these formations to compaction disequilibrium as the overpressure generating mechanism. Although other theories have been presented to explain the high overpressures in Norway (42 MPa in the Kristin Field, for example: lateral transfer: Vik et al (1992), Nysaether (2006 or quartz cementation, Bjørkum and Nadeau (1998), the consensus in the shales is for some factors of secondary processes such as elastic or inelastic unloading, e.g. Teige et al (1999).…”

Section: Introductionmentioning

confidence: 99%

The Resistivity Log and Its Role in Understanding Sediment Unloading in the Lower Kutai Basin, Indonesia

O’Connor,

Ramdhan,

Arifin

et al. 2023

Indonesian J. Geosci.

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High overpressure is a critical drilling issue in the Lower Kutai Basin. Typical pore pressure prediction approaches involve an empirical relationship, such as Eaton’s method using sonic log data. In areas with high geothermal gradients, such as the Lower Kutai Basin, there is evidence for additional overpressure from gas generation such that sediment unloading must be considered to interpret pore pressure correctly. In this paper a repeatable deterministic model is presented for pore pressure from sonic data and, using selected wells from the Lower Kutai Basin, also the use of the resistivity log in a similar model. In the Lower Kutai Basin, sonic logs are often absent from the logging suite or otherwise running over limited intervals, making an alternative log-based prediction method particularly valuable. As a caveat, shallow freshwater encroachment is reported in the Lower Kutai Basin, means the shallow resistivity data can be problematic to use to define both top of overpressure and a normal compaction trend. Care must therefore be taken if resistivity is to be used for the interpretation of unloaded pore pressure, and chiefly applied and this likely to be more successful where encroachment is less pronounced, such as pro-delta shales. Assuming the additional care needed in using resistivity data, this paper suggests that resistivity can be a useful tool for pore pressure prediction in unloaded shale at elevated temperatures within the Lower Kutai Basin. At present the technique has been applied to only a limited dataset due to data availability limitations, but it is hoped with further refinement it will form a helpful additional approach in the pore pressure prediction toolkit. Keywords: pore pressure, resistivity, unloading, Lower Kutai Basin

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Leakage from deep reservoirs: possible mechanisms and relationship to shallow gas in the Haltenbanken area, mid-Norwegian Shelf

Cited by 6 publications

References 0 publications

Forward modeling of paleo heat flow: a case study of Kristin Field, Mid-Norwegian continental shelf

Forward modeling of paleo heat flow: a case study of Kristin Field, Mid-Norwegian continental shelf

The NE Atlantic margin; implications of late Mesozoic and Cenozoic events for hydrocarbon prospectivity

The Resistivity Log and Its Role in Understanding Sediment Unloading in the Lower Kutai Basin, Indonesia

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