Where does S‐wave energy on OBC recordings come from?

Rodriguez-Suarez, Carlos; Stewart, Robert R.; Margrave, Gary F.

doi:10.1190/1.1815598

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…The processing and modelling of the V x component suggested that P-to-S converted reflections represent the dominant mode, and the detailed processing of this component focused consequently on enhancing P-to-S conversions. These results are consistent with recent synthetic modelling performed by Rodriguez-Suarez et al (2000). The top reservoir reflector can be observed as the first strong dipping reflector at approximately 4500-5000 ms.…”

Section: Interpretation and Modellingsupporting

confidence: 81%

Three-component OBS-data processing for lithology and fluid prediction in the mid-Norway margin, NE Atlantic

et al. 2014

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In 1992, a comprehensive three-component ocean bottom seismic survey was performed in the central and northern area of the Vøring Basin, offshore mid-Norway, NE Atlantic. An important part of the data acquisition program consisted of a local survey with 20 Ocean Bottom Seismographs (OBS) dropped at approximately 200 m interval in 1300 m water depth. The main purpose of the local survey was to acquire densely sampled P-and S-wave reflection data above a seismic flatspot anomaly observed earlier, in order to more accurately predict if hydrocarbons could be related to it. The conventional reflection data processing methods applied to the vertical components included predictive deconvolution in order to attenuate low frequency ringing, near offset mute and a series of constant velocity stacks in order to obtain the optimal velocity function. The final result is a "trouser" shaped, high resolution V z stacked section with minor influence of water multiples. The inline (V x ) component contains no strong multiples, and extensive near trace muting was hence not necessary to apply for this component. Velocity analysis together with ray-tracing modelling indicate that P-S-converted shear waves (reflections) represent the dominant mode. The results of the interpretation and modelling indicated a V p /V s -ratio of approximately 2.6 in the overburden, which suggests domination of partly unconsolidated shale, while the V p /V s -ratio in the assumed reservoir was approximately 1.8, which indicates a more sand dominated facies. Outside the flatspot area a higher V p /V s -ratio ratio (approximately 2.0) was estimated, indicating that hydrocarbons could be present in the assumed reservoir.

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Section: Interpretation and Modellingsupporting

confidence: 81%

Three-component OBS-data processing for lithology and fluid prediction in the mid-Norway margin, NE Atlantic

et al. 2014

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“…In this paper, geotechnical data are used, through correlation to direct VS measurements, to obtain values for shear-wave velocities in shallow marine sediments. The values obtained in this work were used, together with additional literature data, in analyses of mode-conversion (P-to -S and S-to -P), for both up-and down-going seismic energy at sea-bottom and in shallow marine sediments (Rodriguez-Suarez et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Shear‐wave velocities in shallow marine sediments

Rodriguez-Suarez

Stewart

2000

SEG Technical Program Expanded Abstracts 2000

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Shear-wave velocities in shallow (0 to 130 m deep) marine sediments are obtained from offshore Brazil. The data, acquired in-situ, consisted of both direct velocity measurements and indirect (geotechnical) predictions. Expressions to correlate VS and depth for shallow marine sediments were derived empirically. We find that VS=48z 0.44 (z is in m and VS in m/s) fits the data closely. This equation describes the sediment shear velocity in the 130 m directly below the ocean floor. This expression predicts values similar to those by Hamilton (1976), but matches very shallow data more closely.

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Analysis of the Teal South, Gulf of Mexico, 3D‐4C seismic survey

Rodriguez-Suarez

Stewart

2000

SEG Technical Program Expanded Abstracts 2000

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Preliminary results of a 3D-4C seismic processing are presented. Reasonable hydrophone and vertical element sections are obtained. The radial component data, after horizontal reorientation, asymptotic binning, and correction for large receiver statics, produced section with continuous events. Shooting direction apparently caused acquisition footprint. The three cable-deployment methods used (trench, tape, sandbag) produced similar results for the P-wave sections. Initial results indicate that the taped deployment (unburied with no sandbags) worked better for the radial. There appear to be some contamination of S-wave energy on the vertical channel, but little P-wave energy on the horizontal channel. The survey provides very promising results for P and P-S analysis.

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Where does S‐wave energy on OBC recordings come from?

Cited by 4 publications

References 14 publications

Three-component OBS-data processing for lithology and fluid prediction in the mid-Norway margin, NE Atlantic

Three-component OBS-data processing for lithology and fluid prediction in the mid-Norway margin, NE Atlantic

Shear‐wave velocities in shallow marine sediments

Analysis of the Teal South, Gulf of Mexico, 3D‐4C seismic survey

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