Faster 3D VSP acquisition using simultaneous sources

Gulati, Jitendra S.; Salama, Antoun; Leaney, Scott; Beasley, Craig J.; Coste, E; Menkiti, Henry; Tulett, John

doi:10.1190/1.3628094

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…Recently, proposals to acquire 3D vertical-seismic-profiling (VSP) data using simultaneous sources to reduce the borehole acquisition cost significantly (Gulati et al, 2011). As we know, VSP data acquisition requires us to stop well production to reduce disruption and noises, and therefore, it is associated with costly rig downtime.…”

Section: Introductionmentioning

confidence: 99%

Imaging blended vertical seismic profiling data using full-wavefield migration in the common-receiver domain

Soni

Verschuur

2015

GEOPHYSICS

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For vertical-seismic-profiling (VSP) measurements, the use of blended acquisition, with time-overlapping shot records, can greatly reduce the downtime and, thereby, provide large cost savings. For directly imaging blended VSP measurements, we have used full-wavefield migration (FWM). FWM is an inversion-based imaging scheme that enables us to use any kind of complex source wavefield to estimate the subsurface reflectivity, using all the multiples (surface and internal) in the recorded data. The multiple scattering helps in improving the illumination as well as the vertical resolution of the image. In this scheme, active deblending is not required because the imaging process itself acts as a deblending procedure. We tested the potential of FWM to image blended VSP data, using simple and complex synthetic models. We clearly determined that using the primaries, surface multiples, and internal multiples enhanced the illumination away from the well trajectory, in which blending noise was suppressed due to the inversion scheme. We observed that some blending crosstalk noise leaked into the images with large blending factors. Such noise could be further reduced with additional constraints in the involved least-squares inversion process.

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Section: Introductionmentioning

confidence: 99%

Imaging blended vertical seismic profiling data using full-wavefield migration in the common-receiver domain

Soni

Verschuur

2015

GEOPHYSICS

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“…Gulati et al (2011) also proposed acquiring 3D VSP data using simultaneous sources to reduce the borehole acquisition cost significantly. Further, there has been been investigation in performing imaging (see Verschuur and Berkhout, 2009;Tang and Biondi, 2009;Jiang and Abma, 2010;Verschuur and Berkhout, 2011;Berkhout et al, 2012;Dai et al, 2012;Huang and Schuster, 2012) of the simultaneous or blended seismic data directly without separating the sources or deblending them.…”

Section: Introductionmentioning

confidence: 99%

Imaging blended VSP data using full wavefield migration

Soni

Verschuur

2013

SEG Technical Program Expanded Abstracts 2013

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SUMMARYBlended source and/or simultaneous source acquisition for multi-offset and multi-azimuth VSP measurements can prove significantly beneficial in saving expensive borehole downtime. In the last few years, for the case of surface seismic data, it was proposed to redefine imaging and inversion of the blended data to handle the data directly without any need to separate the blended sources. Recently, we proposed the concept of full wavefield migration (FWM) to image VSP data, where using all the multiples -both surface and internal multiples -in the imaging provides better illumination, especially away from the well. Using the above mentioned two concepts, in this paper, we will show the potential of FWM to directly image blended VSP data, without the need for intermediate deblending.We can see FWM imaging as a deblending algorithm itself that transforms the blended data into the reflectivity image space by an inversion process. The concept of FWM formulated in terms of a constrained least-squares inversion scheme indeed enables us to use any kind of complex source wavefield to explain the subsurface reflectivity. The method is illustrated successfully for some synthetic blended VSP examples.

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Faster 3D VSP acquisition using simultaneous sources

Cited by 2 publications

References 2 publications

Imaging blended vertical seismic profiling data using full-wavefield migration in the common-receiver domain

Imaging blended vertical seismic profiling data using full-wavefield migration in the common-receiver domain

Imaging blended VSP data using full wavefield migration

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