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EAGE Workshop on Non-Seismic Methods
- Conference date: 12 Oct 2008 - 15 Oct 2008
- Location: Manama, Bahrain
- ISBN: 978-94-6282-065-4
- Published: 12 October 2008
21 - 26 of 26 results
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Falcon gravity gradiometry for petroleum exploration
More LessFalcon technology, incorporating the world's most sensitive and highest resolution airborne gravity system in conjunction with high quality magnetics, is now becoming available for general use in the oil and gas exploration sector. Falcon surveys are useful for a wide range of applications in the sector ranging from reconnaissance geological mapping to detailed mapping of structures and intrusives. The Falcon airborne gravity gradiometers are the only AGGs designed and developed for airborne prospecting. This fit-for-purpose design is the reason for the high sensitivity and resolution; it also provides unique features for survey design and quality analysis.
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From Black Magic to Swarms: Hydrocarbon Exploration using Non-Seismic Technologies
More LessWhy don't hydrocarbon detection methods always work?" Only one third of recent exploration new venture opportunities used surface hydrocarbon detection methods to calibrate the presence of charge in the system. There are distinct differences between the manifestation of hydrocarbons at surface in these environments, which drive the methods applied and ultimately the way in which we interpret these data. Most commercially available onshore ground-based techniques are restricted in their application to prospect-scale assessment, primarily because of logistics and costs. Unfortunately, prospect-scale application often results in ambiguous or misleading results. Offshore applications of surface hydrocarbon methods are better calibrated and practiced. Airborne and satellite systems are commonly used in basin-scale applications. Non-seismic geophysical exploration techniques are important strategic components of the exploration toolkit when properly calibrated and applied. In this paper we review non-seismic exploration technologies including gravity, magnetics, marine electromagnetics, airborne EM, magnetotellurics, remote sensing, LightTouch, and others, indicate recent advances and developments that have enhanced their value, and present real examples and case histories that illustrate the benefits in using combinations of these tools for large scale exploration activities.
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AN INSIGHT INTO THE WALTON BASIN, OFFSHORE JAMAICA - A FALCON® PERSPECTIVE
Authors C. M. Norman, P. N. Nicholls, T. H. Huynh, N. G. Gardiner, D. I. Isles, I. W. Ward and D. M. MooreA high-resolution, high-definition FALCON® airborne gravity gradiometry and magnetic survey - the largest offshore FALCON® survey to date - was flown during mid-2006 over parts of the Walton Basin offshore Jamaica. This data was acquired in conjunction with a marine 2-D reflection seismic survey. The Walton Basin is a relatively under-explored Early-Tertiary rift basin located near the western margin of the present-day Nicaraguan Rise and forming part of the Chortis Block of the greater Caribbean Plate. Results from the seismic survey were augmented with historic offshore seismic data, and a series of key structural events were successfully mapped across much of the Walton Basin. A number of leads and prospects ranging from Late-Cretaceous to Mid-Miocene in structural and stratigraphic traps have been identified with several prospects hosting multiple targets. Preliminary evaluation of a number of these prospects indicates the potential of multi-billion barrel oil accumulations. Preliminary interpretations of the FALCON® datasets have allowed confident mapping and correlation of the shallow intra-basinal sediments in addition to the mapping of deeper basement structures and geometries where the seismic resolution is limited. An integrated approach of employing conventional interpretation methodologies, 2D-forward modelling, 3D-Euler technique and constrained 3-D inversions have shown clear links between the seismic data and the high-resolution potential field data and enabled a more accurate understanding the architecture and stratigraphy of the Walton Basin for hydrocarbon prospectivity. The FALCON® data has enabled quantitative assessment of risk with significantly higher confidence than would be afforded by seismic data alone.
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Imaging multiple horizons with spectral techniques in the Sirt Basin, Libya
Authors S. Y. Yates, I. K. Kivior, S. D. Damte, S. M. Markham and F. V. VaughanHigh resolution aeromagnetic data acquired over the Sirt Basin, Libya, was used to estimate depth to basement, and depth to two intrasedimentary horizons: top of Nubian sandstone, and top of Unit 4 of the Nubian sandstone. Depths to these horizons were calculated through the analysis of energy spectra of the observed magnetic field, while faults and magnetic lineaments were derived through the application of a curvematching method based on the Naudy technique. The project saw the application of a new spectral technique, termed the multiwindow test. When applying energy spectral analysis to windowed potential field data, a poor choice of window size or windowing function will lead to errors in depth estimation. The multiwindow test estimates the depth over a span of window sizes centered over a point of interest; estimates which are not sensitive to window size correspond heuristically to magnetic interfaces. The application of the multiwindow test allowed both rapid, automatic estimation of depth to multiple horizons and also provided a set of windowsizes as suitable candidates for detailed semiautomatic interpretation. The magnetic derived results correlate well with both seismic interpretation and well information. Spectral methods can be successfully applied to image basement and some intrasedimentary horizons in the Sirt Basin, and the multiwindow test has proved itself a valuable tool in producing a robust interpretation of potential field data.
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Fractals, Multi-Fractals, Psuedo-Fractals and Non-Fractals in Energy Spectral Techniques
More LessThe demonstration of fractal processes within the earth has been an important step in understanding many processes and the nature of resultant geomorphology. However the complex nature of interplay between many different processes does not lead to simple measures of fractal geometry in practice. The influence of mutli-fractal processes, nonfractal processes, noise, and the nature of data gathering and processing suggest that a clear extraction of Hurst coefficients is unlikely and possibly flawed.
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Testing survey resolution using spectral analysis
More LessThe resolution of aeromagnetic surveys with line spacings ranging from 200m to 2km was investigated using the energy spectral analysis, multi-window test (MWT) technique. A set of located data from the San Luis basin was sub-sampled to simulate the effect of different survey parameters, in particular line spacing, on the resolution obtainable using MWT. Widely spaced surveys were found to poorly delineate intersedimentary magnetic horizons and were unable to detect shallow magnetic features while surveys with line spacings of 200 and 400m produced the best results.
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