Imaging through Altantic Margin basalts: An introduction to the sub‐basalt mini‐set

Christie, P. A. F.; White, R. S.

doi:10.1111/j.1365-2478.2007.00676.x

Cited by 7 publications

(2 citation statements)

References 24 publications

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“…The target of both studies is to image sub-basalt sediments in a region south-east of the Faroe Islands along the so-called Flare6 line. The thickness of the basalt and the geometry of the sediments below is of great interest for hydrocarbon exploration (Christie and White 2008;Manglik et al 2009;Patro et al 2015) as it determines the potential prospectivity of the hydrocarbon reservoir. Both studies use a combination of seismic travel times and electromagnetic data for their inversion approach.…”

Section: Joint Inversion With Direct Parameter Couplingmentioning

confidence: 99%

Integrating Electromagnetic Data with Other Geophysical Observations for Enhanced Imaging of the Earth: A Tutorial and Review

Moorkamp

2017

Surv Geophys

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In this review, I discuss the basic principles of joint inversion and constrained inversion approaches and show a few instructive examples of applications of these approaches in the literature. Starting with some basic definitions of the terms joint inversion and constrained inversion, I use a simple three-layered model as a tutorial example that demonstrates the general properties of joint inversion with different coupling methods. In particular, I investigate to which extent combining different geophysical methods can restrict the set of acceptable models and under which circumstances the results can be biased. Some ideas on how to identify such biased results and how negative results can be interpreted conclude the tutorial part. The case studies in the second part have been selected to highlight specific issues such as choosing an appropriate parameter relationship to couple seismic and electromagnetic data and demonstrate the most commonly used approaches, e.g., the cross-gradient constraint and direct parameter coupling. Throughout the discussion, I try to identify topics for future work. Overall, it appears that integrating electromagnetic data with other observations has reached a level of maturity and is starting to move away from fundamental proof-of-concept studies to answering questions about the structure of the subsurface. With a wide selection of coupling methods suited to different geological scenarios, integrated approaches can be applied on all scales and have the potential to deliver new answers to important geological questions.

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Section: Joint Inversion With Direct Parameter Couplingmentioning

confidence: 99%

Integrating Electromagnetic Data with Other Geophysical Observations for Enhanced Imaging of the Earth: A Tutorial and Review

Moorkamp

2017

Surv Geophys

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“…Research on subbasalt imaging is popular due to its importance to potential oil discoveries in basins with ubiquitous volcanic cover. Geophysical Prospecting has published two special issues on subbasalt imaging (Williamson, 2003;Christie and White, 2008). These two issues resulted from a workshop entitled "Subbasalt imaging: Exploiting the whole wavefield" held at Cambridge University in 2002 and a dedicated session to subbasalt imaging at the 2005 EAGE annual conference in Madrid.…”

Section: Introductionmentioning

confidence: 99%

Coal seismic surveying over near-surface basalts: Experience from Central Queensland, Australia

Zhou

Hatherly

Peters³

et al. 2014

GEOPHYSICS

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Seismic reflection surveying in basalt-covered areas often fails to image underlying reflectors. To gain insights into the nature of the problem and obtain potential solutions, we have conducted experimental 2D seismic reflection and offset VSP surveys at two coal mines in the Bowen Basin of Australia. At the first mine, the basalt is relatively deep (114 m) and relatively thin (20 m). Conventional seismic acquisition and processing of a 2D seismic line provide poor results. However, upgoing reflections from layers below the basalt are clearly evident in the VSP survey and prestack depth migration is able to improve the continuity of the reflectors beneath the basalt. At the second mine, the 360 m wide basalt is at a depth of 40 m and has a thickness of about 40 m. It is fresh and unweathered and consists of multiple flows which are interlayered with unconsolidated sediments.Long-offset data acquisition combined with prestack depth migration was expected to produce satisfactory results but this is not the case. The associated VSP survey suggests that the problems at this mine are due to (1) the generation of complex downgoing and upgoing wave-fields within the basalt and (2) significant scattering of surface waves from outside the basalt at the margins of the basalt. Another problem is that the target coal seams are at about 300 m depth and the muting required to remove refraction events limited the effectiveness of the prestack depth migration. Reducing the strength of the surface waves through selection of an appropriate source and placement of shots at the base of the low-velocity zone (as had been the case at the first mine) will therefore improve the chances for a successful outcome. A Vibroseis survey subsequently undertaken at the second mine, which produced shot records with reduced surface waves, shows this to be the case.

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Joint Inversion in Hydrocarbon Exploration

Moorkamp¹,

Heincke²,

Jegen³

et al. 2016

Geophysical Monograph Series

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Imaging through Altantic Margin basalts: An introduction to the sub‐basalt mini‐set

Cited by 7 publications

References 24 publications

Integrating Electromagnetic Data with Other Geophysical Observations for Enhanced Imaging of the Earth: A Tutorial and Review

Integrating Electromagnetic Data with Other Geophysical Observations for Enhanced Imaging of the Earth: A Tutorial and Review

Coal seismic surveying over near-surface basalts: Experience from Central Queensland, Australia

Joint Inversion in Hydrocarbon Exploration

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