Comparing state‐of the art near‐surface models of a seismic test line from Saudi Arabia

Bridle, Ralph; Barsoukov, Nikolai; Al-Homaili, M.; Ley, Robert; Al‐Mustafa, Ameerah

doi:10.1111/j.1365-2478.2006.00564.x

Cited by 15 publications

(11 citation statements)

References 18 publications

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“…In any case, subsurface architecture mapping with the seismic reflection method requires a good-quality shallow-velocity structure for static correction performance. Detailed nearsurface models are usually obtained from high-density borehole information or velocity models derived from seismic tomography and/or first arrival inversions (Bridle et al, 2006;The study area of this work is located in Hontomin (Burgos, Spain). This site has been the target for oil exploration during the early 1970s.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a complex near-surface structure using well logging and passive seismic measurements

Benjumea¹,

Macau²,

Gabàs³

et al. 2016

Solid Earth

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Abstract. We combine geophysical well logging and passive seismic measurements to characterize the near-surface geology of an area located in Hontomin, Burgos (Spain). This area has some near-surface challenges for a geophysical study. The irregular topography is characterized by limestone outcrops and unconsolidated sediments areas. Additionally, the near-surface geology includes an upper layer of pure limestones overlying marly limestones and marls (Upper Cretaceous). These materials lie on top of Low Cretaceous siliciclastic sediments (sandstones, clays, gravels). In any case, a layer with reduced velocity is expected. The geophysical data sets used in this study include sonic and gamma-ray logs at two boreholes and passive seismic measurements: three arrays and 224 seismic stations for applying the horizontal-to-vertical amplitude spectra ratio method (H/V). Well-logging data define two significant changes in the P -wave-velocity log within the Upper Cretaceous layer and one more at the Upper to Lower Cretaceous contact. This technique has also been used for refining the geological interpretation. The passive seismic measurements provide a map of sediment thickness with a maximum of around 40 m and shear-wave velocity profiles from the array technique. A comparison between seismic velocity coming from well logging and array measurements defines the resolution limits of the passive seismic techniques and helps it to be interpreted. This study shows how these low-cost techniques can provide useful information about near-surface complexity that could be used for designing a geophysical field survey or for seismic processing steps such as statics or imaging.

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Section: Introductionmentioning

confidence: 99%

Characterization of a complex near-surface structure using well logging and passive seismic measurements

Benjumea¹,

Macau²,

Gabàs³

et al. 2016

Solid Earth

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“…The 2D seismic field data under consideration is provided by Saudi Aramco. The description of the dataset and its geological settings are given by Bridle et al (2006). The data is taken from a 2D line in Saudi Arabia in an area characterized by rough topography and complex near-surface geology.…”

Section: Results For Field Datamentioning

confidence: 99%

Multi-datum based estimation of near-surface full-waveform redatuming operators

Vrolijk

Haffinger

Verschuur

2012

Journal of Applied Geophysics

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“…Coherence inversion (Landa, Keydar and Kravtsov 1995) can yield useful results but is ineffective where coherent noise is present. Refraction traveltime inversion has previously been used to successfully model the near surface (Lanz, Maurer and Green 1998;Bergman, Tryggvason and Juhlin 2006;Zelt, Azaria and Levander 2006;Yordkayhun et al 2007) Bridle et al (2006) showed that it yields better results than the plus-minus method). Traveltime inversion models are quite efficient, often requiring only a few iterations to converge, and are less likely to include unnecessary subsurface features than forward modelling of the same data (White and Boland 1992).…”

Section: Prior Workmentioning

confidence: 97%

Seismic refraction traveltime inversion for static corrections in a glaciated shield rock environment: a case study

Schijns

Heinonen

Schmitt

et al. 2009

Geophysical Prospecting

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A B S T R A C TA traveltime inversion technique is applied to model the upper ∼40 m of the subsurface of a glaciated shield rock area in order to calculate static corrections for a multi-azimuth multi-depth walk-away vertical seismic profile and a surface seismic reflection profile. First break information from a seismic refraction survey is used in conjunction with a ray-tracing program and an iterative damped least-squares inversion algorithm to create a two-dimensional model of the subsurface. The layout of the seismic survey required crooked seismic lines and substantial gaps in the source and receiver coverage to be accounted for. Additionally, there is substantial topographical variation and a complex geology consisting of glaciofluvial sediment and glacial till overlying a crystalline bedrock. The resolution and reliability of the models is measured through a parameter perturbation technique, normalized χ 2 values, root means square traveltime residuals and comparison to known geology. I N T R O D U C T I O NThe town of Outokumpu, in northern Karelia, Finland, is the site of a historical but now depleted base metal mine. Renewed exploration of the area has been spurred in part by the recent acquisition of a crustal-scale seismic reflection profile through Finland acquired as part of the FIRE (Finnish Reflection Experiment) project (Kukkonen et al. 2006; SorjonenWard 2006), which prompted a reassessment of the regional geology. The profile near Outokumpu revealed an unexpected series of horizontal reflectors that appeared to be related to the Outokumpu assemblage exposed at the surface to the northwest and this further motivated the drilling of the International Continental Scientific Drilling Program (ICDP) wellbore to a depth of 2.5 km (Kukkonen and the Outokumpu Deep Drilling Working Group 2007). High-resolution seismic reflection/refraction profiles and multi-azimuth multi-depth walk-away vertical seismic profiles (VSP) were obtained as * E-mail: schijns@ualberta.ca part of this study. However, the analyses of these data were hampered by severe (10-70 ms) static time shifts caused by a combination of the large velocity contrast between the underlying metamorphic rock and Quaternary glacially deposited sands and gravels and the rapidly fluctuating surface topography.Conventional static correction techniques failed to satisfactorily correct either the surface reflection/refraction or the VSP data. Here, an alternative strategy that determines the source and receiver static corrections via seismic refraction traveltime inversion is presented. The utility of these static corrections is illustrated by the improvement to the moveout curves observed in a multi-azimuth, multi-depth VSP survey and the improved imaging of a seismic reflection profile.

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Comparing state‐of the art near‐surface models of a seismic test line from Saudi Arabia

Cited by 15 publications

References 18 publications

Characterization of a complex near-surface structure using well logging and passive seismic measurements

Characterization of a complex near-surface structure using well logging and passive seismic measurements

Multi-datum based estimation of near-surface full-waveform redatuming operators

Seismic refraction traveltime inversion for static corrections in a glaciated shield rock environment: a case study

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