Seismic anisotropy estimation in TTI media using walkaway VSP data

Zhou, Ri-Gui; McAdow, David; Barberan, Celine; Dushman, David; Doherty, Fran

doi:10.1190/1.1851255

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…3D VSP has its primary advantages. It has three‐component geophones close to the imaging target, making direct measurements of receiver depth, arrival times and arrival angles to derive accurate velocity information at a well location; lower attenuation and higher frequency signals of 3D VSP ensure high‐resolution subsurface structure images; walk‐away VSP geometry is useful to estimate anisotropy parameters (e.g., Zhou, Priest and Doherty ; Grechka, Jorgensen and Lopez ); 3D VSP can reveal azimuth variations of a seismic velocity model; massive 3D salt proximities (SP) delineate a better salt‐sediment boundary, which can be used to update a velocity model and to improve estimates of reservoir volumes (e.g., Li, Wang and Jackson ).…”

Section: Introductionmentioning

confidence: 99%

Borehole seismic quantitative diagnosis of a seismic velocity model for 3D seismic imaging of subsurface structures

Hewett

2014

Geophysical Prospecting

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Quantifying uncertainties of surface seismic velocity models is a difficult task. The use of multifarious vertical seismic profiling data provides quantification of velocity model uncertainties. Two borehole seismic diagnosis methods for velocity model uncertainties are developed. The first method is performed with 3D ray‐traced first arrival times through a surface seismic velocity model and compared with measured first arrival times from downhole receivers. It generates a profile of absolute and relative misfits, indicating the velocity uncertainty as a function of depth. The second approach directly compares the differences between the first arrival incident angles measured from 3‐C borehole seismic data and the calculated first arrival incident angles of seismic rays through the velocity model to quantify the model uncertainties. Five seismic velocity models in the Gulf of Mexico are diagnosed using the diagnosis methods with up to six sets of borehole seismic data recorded in three wells. The uncertainty profiles vary with depths and azimuths, revealing the complexity of velocity model uncertainties and providing some clues for further velocity updating. The diagnosis methods are used as velocity updating QC tools and integrated with the conventional seismic velocity updating flow to complement the criteria of flat common image gathers.

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Section: Introductionmentioning

confidence: 99%