Broadband land acquisition — Survey design issues

Pramik, Bill

doi:10.1190/1.3628525

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…First, the ellipsoids associated with reflected and diffracted energy may not destructively interfere at steep dips, giving rise to operator aliasing ( Figure 1). Second, undersampled noise, such as ground roll and shallow diffractions, which (if properly sampled) should exhibit short apparent wavelength and strong moveout and should be filtered out by migration, are instead aliased to longer apparent wavelength and gentler moveout and will be passed and subsequently imaged by migration (Dev and McMechan, 2009;Pramik, 2011). Biondi (2001) describes a common workflow to suppress operator aliasing that simply filters out higher frequencies when migrating to steeper dips.…”

Section: Methodsmentioning

confidence: 99%

The value of constrained conjugate-gradient least-squares migration in seismic inversion: Application to a fractured-basement play, Texas Panhandle

Marfurt

2017

Interpretation

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Seismic inversion has become almost routine in quantitative 3D seismic interpretation. To ensure the quality of the seismic inversion, the input seismic data need to have a high signal-to-noise ratio. With the current low oil price environment, seismic reprocessing is often preferred over reacquisition to improve data quality. Common filter pairs include forward and inverse f-k and Radon transforms. Forward and inverse migrations (i.e., migration and demigration) are a more recently introduced transform pair that, when used together in an iterative workflow, results in a least-squares migration algorithm. Least-squares migration compensates for surface variation in data density and, when combined with a filter applied to prestack migrated images, suppresses the operator and data aliasing. We apply a least-squares migration workflow to a fractured-basement data set from the Texas Panhandle to demonstrate the enhancement in signal-to-noise ratio, the reduction in acquisition footprint and migration artifacts, and the improvement in the P-impedance inversion result.

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Section: Methodsmentioning

confidence: 99%

The value of constrained conjugate-gradient least-squares migration in seismic inversion: Application to a fractured-basement play, Texas Panhandle

Marfurt

2017

Interpretation

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“…Geokinetics' synchronized electronic impulsive source (SEIS) system (also known as onSeis or electromagnetic thumper) (Pramik, 2011;Pramik and Bell, 2011) is about the same size as modern AWD units. The SEIS unit is quite special because it is based on weight lifted by an electromagnetic force rather than weight dropped (Pesa News Resources, 2010).…”

Section: Source Typesmentioning

confidence: 99%

3D Seismic Survey Design, Second edition

Vermeer¹

2012

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“…Modern slip-sweep vibrator technology provides a means of economically acquiring denser source points in areas with relatively easy access, providing a proper sampling of shallow diffractors, thereby improving the deeper image (Pramik, 2011).…”

Section: Interpretation and Advances In Seismic Acquisition And Procementioning

confidence: 99%

“…We predict (pray?) that continued advances in slip-sweep, encoded, single vibrator acquisition will make-high density land seismic data routine in areas that do not have significant access costs, removing the acquisition footprint headache from our workstations and providing enhanced suppression of shallow sidescattered noise (Pramik, 2011).…”

Section: Interpretation In the Futurementioning

confidence: 99%

Evolution of seismic interpretation during the last three decades

Chopra¹,

Marfurt

2012

The Leading Edge

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The ingredients of seismic interpretation include the right mix of geological and geophysical knowledge, together with a liberal dose of imagination, tempered with a considerable amount of patience. Seismic interpretation is a skill that one acquires with experience, but is constantly reinvigorated with new ideas and tools provided by younger university graduates. The prime ingredients for seismic interpretation are seismic reflection data coupled with a geologic depositional and tectonic model which together provide the framework for integrating borehole, microseismic, and production data resulting in a good reservoir model. Although commonly used in both engineering and environmental applications, most seismic reflection surveys are acquired for oil and gas exploration in both land and offshore areas around the world. Hydrocarbon accumulations are found at varying depths of a few thousand meters below the Earth's surface which are ultimately confirmed by drilling. Because the cost of drilling closely spaced wells can be prohibitively expensive, interpreted seismic data provide not only initial well locations in a wildcat environment, but also, when coupled statistically with production and well-log data, locations with higher probability of success in a resource play having hundreds of wells.

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Broadband land acquisition — Survey design issues

Cited by 5 publications

References 1 publication

The value of constrained conjugate-gradient least-squares migration in seismic inversion: Application to a fractured-basement play, Texas Panhandle

The value of constrained conjugate-gradient least-squares migration in seismic inversion: Application to a fractured-basement play, Texas Panhandle

3D Seismic Survey Design, Second edition

Evolution of seismic interpretation during the last three decades

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