Beyond curvature — volumetric estimates of reflector rotation and convergence

Marfurt, Kurt J.; Rich, Jamie

doi:10.1190/1.3513118

Cited by 35 publications

(11 citation statements)

References 9 publications

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“…Such changes in strike indicate nonplanar fault planes and subsequent twisting of the Woodford Shale. The reflector rotation with respect to reflector normal attribute volume (Marfurt and Rich, 2010) further shows such SB92 Interpretation / November 2013 "twisting" and maps the relative movements of the fault blocks with respect to each other (Figure 17). Guo et al (2010) used the shape index modulated by the curvedness attribute volume to illuminate the surface irregularity of the Woodford Shale in the Ar-koma Basin.…”

Section: Interpretation / November 2013 Sb91mentioning

confidence: 98%

Seismic attribute driven integrated characterization of the Woodford Shale in west-central Oklahoma

2013

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The organic-rich, silty Woodford Shale in west-central Oklahoma is a prolific resource play producing gas and liquid hydrocarbons. We calibrated seismic attributes and prestack inversion using well logs and core information within a seismic geomorphologic framework to define the overall basin architecture, major stratigraphic changes, and related variations in lithologies. Core measurements of elastic moduli and total organic content (TOC) indicated that the Woodford Shale can be broken into three elastic petrotypes important to well completion and hydrocarbon enrichment. Upscaling these measurements facilitates regional mapping of petrotypes from prestack seismic inversion of surface data. Seismic attributes highlight rugged topography of the basin floor of the Paleo Woodford Sea, which controls the lateral and vertical distribution of different lithofacies containing variable quantity of TOC as well as quartz, which controls brittleness. Depressions on the basin floor contain TOC-lean cherty lithofacies alternating with TOC-rich lithofacies, resulting in brittle-ductile rock couplets. In contrast, basin floor highs are characterized by overall TOC-rich ductile lithofacies. Seismic attributes illuminate complex post-Woodford tectonic deformation. The Woodford Shale is known to be naturally fractured on outcrop. Image log analysis in other shale plays showed a good correlation between such tectonic features and natural fractures. These features need to be correlated with well trajectories and production data to determine which hypothesized "fracture sets," if any, improve well performance.

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Section: Interpretation / November 2013 Sb91mentioning

confidence: 98%

Seismic attribute driven integrated characterization of the Woodford Shale in west-central Oklahoma

2013

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“…The rugose surface (orange arrows) is a product of a shorter wavelength and indicates less deformation. Additionally, reflector rotation and convergence computed from the curvature dip components (Marfurt and Rich, 2010). The dissolution caves zone is coincident with through-going faults terminate in the Marble Falls formation.…”

Section: Spectral Decompositionmentioning

confidence: 98%

“…Computationally, it is convenient to convert from the dip vector p, to the normal vector n. Marfurt and Rich (2010) where the^denotes the unit normal. The divergence of the structural dip vector is twice the mean curvature.…”

Section: Structure Rotation and Convergencementioning

confidence: 99%

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Attribute expression of fault-controlled karst — Fort Worth Basin, Texas: A tutorial

Zhang

Zhou

et al. 2014

Interpretation

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Much of seismic interpretation is based on pattern recognition, such that experienced interpreters are able to extract subtle geologic features that a new interpreter may easily overlook. Seismic pattern recognition is based on the identification of changes in (1) amplitude, (2) phase, (3) frequency, (4) dip, (5) continuity, and (6) reflector configuration. Seismic attributes, which providing quantitative measures that can be subsequently used in risk analysis and data mining, partially automate the pattern recognition problem by extracting key statistical, geometric, or kinematic components of the 3D seismic volume. Early attribute analysis began with recognition of bright spots and quickly moved into the mapping of folds, faults, and channels. Although a novice interpreter may quickly recognize faults and channels on attribute time slices, karst terrains provide more complex patterns. We sought to instruct the attribute expression of a karst terrain in the western part of the Fort Worth Basin, Texas, United States of America. Karst provides a specific expression on almost every attribute. Specifically, karst in the Fort Worth Basin Ellenburger Group exhibits strong dip, negative curvature, low coherence, and a shift to lower frequencies. Geomorphologically, the inferred karst geometries seen in our study areas indicate strong structural control, whereby large-scale karst collapse is associated with faults and where karst lineaments are aligned perpendicularly to faults associated with reflector rotation anomalies.

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“…Examination of Figure 15 leads to the observation that although the middle of the channel forms have a trough-like appearance, the edges "roll-off" into angular unconformities. Reflector convergence (Marfurt and Rich, 2010) is an attribute sensitive to such unconformities. It works by calculating the magnitude to which reflectors converge together, as well as the direction of any such convergence.…”

Section: Single Attribute Analysismentioning

confidence: 99%

Attribute expression of channel forms in a hybrid carbonate turbidite formation

Wallet

2016

Interpretation

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Much of the world's conventional oil and gas production comes from turbidite systems. Interpreting them in three dimensions using commercially available software generally requires seismic attributes. Hybrid carbonate turbidite systems are an interesting phenomenon that is not fully understood. I have examined the attribute expression of channel forms in a hybrid carbonate turbidite system from off the coast of Western Australia. I have determined several characteristic responses to attributes that improve the ability to identify and delineate the channel forms. Finally, I have evaluated and developed a workflow that is effective at modeling and extracting the channel forms in three dimensions, leading to a product that can be used in further understanding of how carbonate turbidite systems develop.

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Beyond curvature — volumetric estimates of reflector rotation and convergence

Cited by 35 publications

References 9 publications

Seismic attribute driven integrated characterization of the Woodford Shale in west-central Oklahoma

Seismic attribute driven integrated characterization of the Woodford Shale in west-central Oklahoma

Attribute expression of fault-controlled karst — Fort Worth Basin, Texas: A tutorial

Attribute expression of channel forms in a hybrid carbonate turbidite formation

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