Heat flow, geothermal gradients and maturation modelling on the Norwegian continental shelf using computer methods

Leadholm, R. H.; Ho, Thomas T. Y.; Sahai, S. K.

doi:10.1007/978-94-009-4199-1_9

Cited by 18 publications

(27 citation statements)

References 5 publications

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“…Within this uncertainty, our timing of HC generation in the Graben axis for the Draupne (onset of oil generation around 85 • 5 Ma, peak oil generation around 67-70Ma, and top gas window reached at 55 _+ 5 Ma) and for the kitchens of the Tampen Spur area (35 Ma,30 Ma,(0)(1)(2)(3)(4)(5) Ma respectively) appears about 10-20 Ma later than previously published (e.g. Leadholm et al 1985). This difference is not very important; it is however believed to reflect the conceptual difference between our kinetic approach (bases on activation energies centered around 55kcal/mole) and the TTI approach generally found in the literature (implicitly based on activation energies of 20 kcal/mole; Tissot et al 1987).…”

Section: Discussionmentioning

confidence: 50%

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Are numerical models useful in reconstructing the migration of hydrocarbons? A discussion based on the Northern Viking Graben

Burrus

Kuhfuss

Doligez

et al. 1991

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The 2D-finite-difference code TEMISPACK is used to discuss the history of hydrocarbon (HC) generation, expulsion and migration along a 160 km long transect across the Northern Viking Graben. In the first section, HC generation is discussed based on hypotheses on the crustal heat flow; a kinetic model is used to calculate the maturity. Observations are shown to be consistent with a 67 mW m-2 heat flow, possibly 60 mW m-2 in the graben axis. The precision of the calibrated heat flow is not more than 10%, which results in an uncertainty of the timing of HC generation of 5-10 Ma. The development of overpressures, observed today in the deep Jurassic reservoirs is shown to be essentially controlled by compaction, with a minor contribution due to gas generation; the model also shows that faults related to the Jurassic rifting are most certainly impermeable. In the second section, the previous overpressures and maturity reconstructions form the framework in which expulsion and migration of HC are modelled, based on the two-phase (water, hydrocarbon) Darcy law. The computation explains the filling of the tilted blocks located in the Tampen Spur zone as well as the presence of gas at Troll. A sensitivity analysis shows the importance of poorly constrained parameters such as the relative permeability curves, capillary pressures, or the properties of the petroleum fluids.

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Section: Discussionmentioning

confidence: 50%

“…The rnaturity of the source-rocks and the thermal regime have been discussed in numerous studies (Evans & Coleman 1974;Carstens & Finstad 1981;Eggen 1985;Thomas et al 1985;Leadholm et at. 1985).…”

Section: The Geological Framework; An Overviewmentioning

confidence: 98%

Are numerical models useful in reconstructing the migration of hydrocarbons? A discussion based on the Northern Viking Graben

Burrus

Kuhfuss

Doligez

et al. 1991

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“…The discovery was made by a consortium of four oil companies of which Conoco was a member. This milestone was very significant because it sparked the oil industry's interest in the area, and because it was the first oil ever discovered north of the 62nd parallel in the Norwegian Sea (Vielvoye 1984;Leadholm et al 1985;Whitley 1992). Since this first oil discovery there have been seven major oil fields found (Larsen & Heum, 1988;fig.…”

Section: History Of Hydrocarbon Exploration In the Halten Terracementioning

confidence: 99%

“…The post-drilled data in this paper includes not only measured maturity levels but also modelled results from publicly available modelling programs such as the Ytikler program (Yiikler & Welte 1980) and BasinMod. The predicted data used in this comparative study were published by Leadholm et al (1985). Primarily, however, the objective of this paper is to demonstrate that velocity-based thermal conductivity can be one of the best parameters to calibrate Ho, T. T. Y., JENSEN, R. E, SAHAI, S. K., LEADHOLM, R. H. & SENNESETH, O.…”

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confidence: 99%

Comparative studies of pre- and post-drilling modelled thermal conductivity and maturity data with post-drilling results: implications for basin modelling and hydrocarbon exploration

Ho¹,

Jensen²,

Sahai³

et al. 1998

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The primary objective of this paper is to demonstrate the successful application of maturation modelling using velocity-based thermal conductivity in the whole cycle of hydrocarbon exploration (frontier, developing and mature) on the Halten Terrace, Offshore Norway. This seismic geochemical method, used as a critical technique for selecting a favourable block in the early stages of exploration in the early 80s, enabled Conoco and its partners to make the first oil discovery and the subsequent discovery of the giant Heidrun Field in the area north of the 62nd parallel.Additional data (modelled and measured) on the thermal conductivity and Ro values are now available, and provide an excellent opportunity to compare the original (pre-drilling) basin models and related modelled results of the early 80s with 1990s (post-drilling) state-of-the-art data and models. The results of the comparative study indicate that the velocity-based conductivity compares very well with measured data, particularly in an overpressured area where conventional porosity (modelled) based thermal conductivities were inadequate. The pre-drilling predicted values of heat flow, geothermal gradient and vitrinite reflectance (based on Arrhenius equation) and oil window limits also compared favourably with post-drilling measured results. Thus, the method of calculating thermal conductivity from seismic data provides a useful tool to integrate geochemistry and geophysical (seismic) data, to calibrate maturation models, and to enhance the value of geochemistry and basin modelling in hydrocarbon exploration.for basin modelling and hydrocarbon exploration.

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“…However, a petroleum system is an open system subject to fluid mass flux, and errors may therefore come from element introduction (a major problem in dating with radiometric methods and the reason that absolute dating is rarely applied) (Parnell, 1998). In contrast, relative dating via basin modelling calculations has been used by several authors (Leadholm et al, 1985;Sørensen, 1985;Ungerer et al, 1990;Burley et al, 2000;Skeie et al, 2004) and is the general approach in industry. Karlsen et al (1993), Bhullar et al (1999) and Tseng and Pottorf (2002) combined burial modelling and fluid inclusion techniques to constrain the petroleum charging history in siliciclastic reservoirs.…”

Section: Introductionmentioning

confidence: 96%

Petroleum accumulation and leakage in a deeply buried carbonate reservoir, Níspero field (Mexico)

Bourdet

Pironon

Levresse³

et al. 2010

Marine and Petroleum Geology

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Heat flow, geothermal gradients and maturation modelling on the Norwegian continental shelf using computer methods

Cited by 18 publications

References 5 publications

Are numerical models useful in reconstructing the migration of hydrocarbons? A discussion based on the Northern Viking Graben

Are numerical models useful in reconstructing the migration of hydrocarbons? A discussion based on the Northern Viking Graben

Comparative studies of pre- and post-drilling modelled thermal conductivity and maturity data with post-drilling results: implications for basin modelling and hydrocarbon exploration

Petroleum accumulation and leakage in a deeply buried carbonate reservoir, Níspero field (Mexico)

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