3-D geological modelling of the Egebjerg area, Denmark, based on hydrogeophysical data

Jørgensen, Flemming; Møller, Rasmus Rønde; Sandersen, Peter B.E.; Nebel, Lars

doi:10.34194/geusb.v20.4892

Cited by 24 publications

(18 citation statements)

References 4 publications

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“…; Jørgensen et al . ). Numerous generations of tunnel valleys associated with multiple glaciations have been discovered on land in northern Europe (Mojski ; Tavast & Raukas ; Ehlers et al .…”

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confidence: 97%

On the origin of tunnel valleys of the Saginaw Lobe of the Laurentide Ice Sheet; Michigan, USA

Kehew

Ewald

Esch

et al. 2012

Boreas

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Tunnel valleys are common throughout the terrain of the Saginaw Lobe of the Laurentide Ice Sheet in southern Michigan. The set of valleys described in this paper is regularly spaced in a radial pattern behind the Kalamazoo Moraine, an ice-marginal position formed during retreat from the Last Glacial Maximum. These valleys are divided into proximal and distal groups lying north and south, respectively, of a major river valley that cross-cuts the tunnel valleys at right angles. Based on a series of rotasonic borings and core analysis, the proximal valleys are shallow, contain minimal sediment fill, and overlie fine-grained diamicton and glaciolacustrine sediment, whereas the distal valleys are deeply incised into the substrate and are partially filled with coarse sediment. The distal valleys terminate within a broad zone of high-relief, hummocky topography representing stagnation and collapse behind the Kalamazoo ice margin. The proximal valleys occur within a more subdued landscape located farther from the ice margin. Although some elements of existing genetic models are consistent with these valleys, none appears to be completely compatible with their stratigraphy and morphology. Initial incision of the valleys could have involved short-lived moderate-to high-discharge flows, followed by deposition during or after the events. The deep incision and thick, coarse sediment in distal valleys in the stagnant marginal zone probably involved supraglacial meltwater draining to the bed as the margin downwasted. Fining-upward eskers inset into the valleys were formed by flows of declining energy in small late-stage conduits.

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confidence: 97%

On the origin of tunnel valleys of the Saginaw Lobe of the Laurentide Ice Sheet; Michigan, USA

Kehew

Ewald

Esch

et al. 2012

Boreas

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“…This area has been thoroughly mapped by mainly SkyTEM and deep drillings, and geological interpretations have been performed by combining with, and validation against, new and existing borehole data. The interpreted geology of the area was reported by Jørgensen et al (2010). The upper cross section (Fig.…”

Section: D Resistivity Gridsmentioning

confidence: 99%

A method for cognitive 3D geological voxel modelling of AEM data

Jørgensen

Møller

Nebel³

et al. 2013

Bull Eng Geol Environ

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Airborne electromagnetic (AEM) data have proven successful for the purpose of near-surface geological mapping and are increasingly being collected worldwide. However, conversion of data from measured resistivity to lithology is not a straightforward task. Therefore, it is still challenging to make full use of these data. Many limitations must be considered before a successful geological interpretation can be performed and a reasonable 3D geological model constructed. In this paper, we propose a method for 3D geological modelling of AEM data in which the limitations are jointly considered together with a cognitive and knowledge-driven data interpretation. The modelling is performed iteratively by using voxel modelling techniques with tools developed for this exact purpose. Based on 3D resistivity grids, the tools allow the geologist to select voxel groups that define any desirable volumetric shape in the 3D model. Recent developments in octree modelling ensure exact modelling with a limited number of voxels.

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“…The resistivity variations can be directly used in a 3D geological modelling (Jørgensen et al . ; Høyer et al . ; Sapia et al .…”

Section: Introductionmentioning

confidence: 99%

Slopes of an airborne electromagnetic resistivity model interpolated jointly with borehole data for 3D geological modelling

Reninger

Martelet

Perrin

et al. 2016

Geophysical Prospecting

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International audienceWe investigate a novel way to introduce resistivity models deriving from airborne electromagnetic surveys into regional geological modelling. Standard geometrical geological modelling can be strengthened using geophysical data. Here, we propose to extract information contained in a resistivity model in the form of local slopes that constrain the modelling of geological interfaces. The proposed method is illustrated on an airborne electromagnetic survey conducted in the region of Courtenay in France. First, a resistivity contrast corresponding to the clay/chalk interface was interpreted confronting the electromagnetic soundings to boreholes. Slopes were then sampled on this geophysical model and jointly interpolated with the clay/chalk interface documented in boreholes using an implicit 3D potential-field method. In order to evaluate this new joint geophysical–geological model, its accuracy was compared with that of both pure geological and pure geophysical models for various borehole configurations. The proposed joint modelling yields the most accurate clay/chalk interface whatever the number and location of boreholes taken into account for modelling and validation. Compared with standard geological modelling, the approach introduces in between boreholes geometrical information derived from geophysical results. Compared with conventional resistivity interpretation of the geophysical model, it reduces drift effects and honours the boreholes. The method therefore improves what is commonly obtained with geological or geophysical data separately, making it very attractive for robust 3D geological modelling of the subsurface

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3-D geological modelling of the Egebjerg area, Denmark, based on hydrogeophysical data

Cited by 24 publications

References 4 publications

On the origin of tunnel valleys of the Saginaw Lobe of the Laurentide Ice Sheet; Michigan, USA

On the origin of tunnel valleys of the Saginaw Lobe of the Laurentide Ice Sheet; Michigan, USA

A method for cognitive 3D geological voxel modelling of AEM data

Slopes of an airborne electromagnetic resistivity model interpolated jointly with borehole data for 3D geological modelling

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