New insights from a 3D earth model, deepwater Gulf of Mexico

Prieto, Corine; Morton, Glenn

doi:10.1190/1.1572090

Cited by 10 publications

(4 citation statements)

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“…Thus, it is commonly possible to estimate the depth to basement and, under favorable circumstances, quantitatively map basement structures, such as faults and horst blocks (e.g., Prieto and Morton, 2003). For the most part, basin fill typically has a much lower susceptibility than the crystalline basement.…”

Section: Ground and Airborne Magnetic Surveysmentioning

confidence: 99%

9. Magnetic Exploration Methods

Nabighian¹,

Grauch²,

Hansen³

et al. 2010

Geophysics Today

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The magnetic method, perhaps the oldest of geophysical exploration techniques, blossomed after the advent of airborne surveys in World War II. With improvements in instrumentation, navigation, and platform compensation, it is now possible to map the entire crustal section at a variety of scales, from strongly magnetic basement at regional scale to weakly magnetic sedimentary contacts at local scale. Methods of data filtering, display, and interpretation have also advanced, especially with the availability of low-cost, high-performance personal computers and color raster graphics. The magnetic method is the primary explo-ration tool in the search for minerals. In other arenas, the magnetic method has evolved from its sole use for mapping basement structure to include a wide range of new applications, such as locating intrasedimentary faults, defining subtle lithologic contacts, mapping salt domes in weakly magnetic sediments, and better defining targets through 3D inversion. These new applications have increased the method's utility in all realms of exploration -in the search for minerals, oil and gas, geothermal resources, and groundwater, and for a variety of other purposes such as natural hazards assessment, mapping impact structures, and engineering and environmental studies.

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Section: Ground and Airborne Magnetic Surveysmentioning

confidence: 99%

9. Magnetic Exploration Methods

Nabighian¹,

Grauch²,

Hansen³

et al. 2010

Geophysics Today

View full text Add to dashboard Cite

show abstract

“…For the most part, basin fill typically has a much lower susceptibility than the crystalline basement. Thus, it is commonly possible to estimate the depth to basement and, under favorable circumstances, quantitatively map basement structures, such as faults and horst blocks (Prieto and Morton, 2003).…”

Section: Geomagnetics and Airborne Magneticmentioning

confidence: 99%

Exploration Methods

Bruhn

Manzella

Vuataz

et al. 2010

Geothermal Energy Systems

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“…Recently, there has been much progress in the development of gravity and magnetic acquisition tools that may aid exploration within the regolith (Lee, 2001;Gamey et al, 2002;Doll et al, 2003;Hammond and Murphy, 2003;Prieto and Morton, 2003;Schmidt et al, 2004;Stening et al, 2004). This paper examines the effectiveness of gravity and magnetic gradient tensor data in exploration through and within a simulated regolith cover.…”

Section: Introductionmentioning

confidence: 99%

Modelling Gravity and Magnetic Gradient Tensor Responses for Exploration Within the Regolith

Heath

Greenhalgh

Direen

2005

Exploration Geophysics

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The regolith obscures much of Australia's bedrock geology, posing problems for mineral exploration under cover. Gravity and magnetic gradient tensor data can provide significant improvements over established potential field techniques by producing maps showing subtle variations in field data which relate to the subsurface geology, but which are hidden to standard total or vertical field measurements. We examine the forward potential field response of a complex three-dimensional regolith model that contains targets such as palaeochannels, land mines, and mineralisation. By summing the field responses from many small elementary cubes, it is possible to represent complex structures to yield the full gradient tensor response at a specified height above the ground.The gravity gradient tensor data from the model ranges over values from -0.12 to 0.2 Eötvös, and the magnetic gradient tensor data for the model ranges from -1000 to 600 nanoTeslas per metre (when measured at the surface), over typical regolith-related features. When a flight height of 80 m is used, the responses diminish considerably, and only the long-wavelength features of the model are detectable.Model response values are compared to the measurable responses from existing acquisition systems, and it is shown that the magnetic gradient tensor case is most suited to regolith investigations. The resolution required for the gravity gradient tensor appears to be higher than is possible with current gravity gradiometers.

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New insights from a 3D earth model, deepwater Gulf of Mexico

Cited by 10 publications

References 0 publications

9. Magnetic Exploration Methods

9. Magnetic Exploration Methods

Exploration Methods

Modelling Gravity and Magnetic Gradient Tensor Responses for Exploration Within the Regolith

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