Gaining a geostatistical advantage in near‐surface modeling

Bridle, Ralph

doi:10.1190/1.3059138

Cited by 6 publications

(1 citation statement)

References 14 publications

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“…These concepts are afterwards illustrated through four examples. The two first examples correspond to near‐surface applications where the use of geostatistics is not classical (Chilès and Guillen 1984; Peinado 1996; Vesnaver 2006; Bridle 2008). The two last examples are more common applications to property modelling and time to depth conversion.…”

Section: Introductionmentioning

confidence: 99%

A practical review of geostatistical processing applied to geophysical data: methods and applications

Bourges¹,

Mari

Jeannée³

2012

Geophysical Prospecting

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Nowadays, geostatistics is commonly applied for numerous gridding or modelling tasks. However, it is still under used and unknown for classical geophysical applications. This paper highlights the main geostatistical methods relevant for geophysical issues, for instance to improve the quality of seismic data such as velocity cubes or interpreted horizons. These methods are then illustrated through four examples. The first example, based on a gravity survey presents how a geostatistical interpolation can be used to filter out a global trend, in order to better define real anomalies. In the second case study, dedicated to refraction surveying, geostatistical filtering is used to filter out acquisition artefacts and identify the main geological structures. The third one is an example of porosity being integrated geostatistically with a seismic acoustic impedance map. The last example deals with geostatistical time to depth conversion; the interest of performing geostatistical simulations is finally discussed.

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Section: Introductionmentioning

confidence: 99%

A practical review of geostatistical processing applied to geophysical data: methods and applications

Bourges¹,

Mari

Jeannée³

2012

Geophysical Prospecting

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Inversion of donor vertical time shifts to update a near-surface depth/velocity model

Bridle

Hubbell

2015

GEOPHYSICS

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The near-surface model for static corrections requires a consistent regional depth/velocity model, while incorporating the fidelity of additional static solutions. We addressed the challenge of tying new seismic acquisition to a depth/velocity model, in which there are static corrections derived independently for each seismic data. The generalized method is a four-step procedure that starts with the grafting of the additional shifts to the recipient static model. The time shifts were then adjusted to constrain the long wavelength at defined locations. The next procedure was to split the time shifts into high- and low-frequency components. The final procedure inverted the high frequency into the shallowest layers and the long wavelength to the velocity from base of model to datum. The result was an updated regional depth/velocity model into which new 2D depth/velocity models could be tied. The generalized solution would work with any additional near-surface static corrections, which could include, and not be limited to, those built from surface waves, remote sensing, and joint inversion with nonseismic data. The inversion of the additional time shifts was primarily intended to provide a solution to their tie and any image improvement is serendipitous. We progressively learned lessons from a simple inversion and achieved the generalized solution.

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