Comparison of Spectral Enhancement Techniques Applied to Post Stack Data

McArdle, Nick; Paton, Gaynor

doi:10.3997/2214-4609.20141567

Cited by 3 publications

(1 citation statement)

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“…Spectral enhancement aims at increasing the bandwidth of the data set by selectively boosting portions of the seismic signal with distinguishable frequency content (McArdle and Paton, 2014). Enhancing the high end of the frequency spectrum allows for better imaging of thin beds and provides better continuity and interpretability of the data.…”

Section: Spectral Enhancementmentioning

confidence: 99%

Characterizing carbonate facies using high-definition frequency decomposition: Case study from North West Australia

Almaghlouth

Szafián²,

Bell

2017

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Carbonate facies identification is difficult using conventional seismic attributes due to subtle lithologic changes that cannot be easily recognized. Therefore, there is a need to develop new methodologies to study their evolution and their associated sedimentary processes, which will eventually lead to better prediction for reservoir-quality rocks. New insights into the Cenozoic carbonates in North West Australia have been captured with the application of a high-definition seismic attribute workflow. The workflow starts with conditioning of the seismic volume using structurally oriented noise attenuation filters to remove any random and coherent noise from the input data. It also benefits from a high-definition frequency decomposition that matches the original seismic resolution without smearing interfaces using a "matching pursuit" algorithm. A color blend of multigeometric attributes, such as semblance and conformance, has also been used in the workflow to define edges and discontinuities present in the data within carbonate deposits that are attributed to depositional geometries, such as barrier reefs. Our workflow has been developed to investigate the geomorphology and the sedimentary processes affecting Cenozoic successions in the Northern Carnarvon Basin in North West Australia. Geomorphological and sedimentological observations have been documented such as an Eocene rounded carbonate ramp with evidence of slump blocks and scarps, Middle Miocene accretions generated due to longshore drift, and the presence of Pliocene-Pleistocene patch and barrier reefs. These observations were extracted as geobodies to allow for visualization, and they can be used in an automated seismically based facies classification scheme. The new appreciations are not only useful for understanding the carbonate evolution but can also be used to identify geohazards such as slumps ahead of future drilling.

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Section: Spectral Enhancementmentioning

confidence: 99%

Characterizing carbonate facies using high-definition frequency decomposition: Case study from North West Australia

Almaghlouth

Szafián²,

Bell

2017

Interpretation

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Discrete wavelet transform-based multiresolution analysis and spectral enhancement to characterize heavy oil reservoirs in the southern Gulf of Mexico region

2016

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In Neogene geologic settings, seismic resolution plays an important role in the static characterization of large stratigraphically complex reservoirs. Attenuation of high frequencies due to absorption and scattering of waves propagating through the subsurface contributes to the loss of seismic resolution, resulting, in particular, to a poor delineation of thin beds. This case history comprised the resolution enhancement of seismic data from one petroleum field located in the southern Gulf of Mexico. We applied discrete wavelet transform-based multiresolution analysis to identify frequency components in the data that required spectral enhancement. The resulting enhanced power spectrum contains a higher frequency content, which made it possible to identify new heavy oil (11°–23° API) reservoirs located in thin sandstones of deltaic sedimentary environments. The methodology used here helped us to cope with the attenuation problem.

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Closing the seismic resolution gap of fractures through seismic and image-log analysis, a North Sea case study

Williams¹,

Pascual-Cebrian

Gutmanis

et al. 2017

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The “seismic resolution gap” has been an area of ambiguity ever since the results of 3D seismic interpretation have been used as inputs for modeling purposes because many important structural events such as fractures are at or below seismic resolution, which can impinge reservoir properties such as porosity and permeability. Having the means to accurately map these events with confidence has always been a challenge. More often than not, localized mapping of these features at borehole conditions can be achieved by core or image-log analysis. Seismic-derived attributes have assisted in improving the interwell geologic understanding in a lateral sense, but they are always hampered by vertical resolution. Enhanced imaging, such as cyan-magenta-yellow blending of attributes, has helped improve the lateral understanding of fracture patterns and networks, as shown in this workflow, but the challenge with vertical resolution still persists. However, by combining borehole and seismic data studies in a distinct workflow, it has become possible to identify overlaps and misalignments, which in turn has assisted in identification of discrete structural patterns not previously identified because of the seismic resolution gap. These results will then be used to improve the confidence of structural interpretation and static fracture models, which all go toward improving reservoir simulation models and geologic understanding.

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Comparison of Spectral Enhancement Techniques Applied to Post Stack Data

Cited by 3 publications

References 0 publications

Characterizing carbonate facies using high-definition frequency decomposition: Case study from North West Australia

Characterizing carbonate facies using high-definition frequency decomposition: Case study from North West Australia

Discrete wavelet transform-based multiresolution analysis and spectral enhancement to characterize heavy oil reservoirs in the southern Gulf of Mexico region

Closing the seismic resolution gap of fractures through seismic and image-log analysis, a North Sea case study

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