SV-P extraction and imaging for far-offset vertical seismic profile data

Li, Yandong; Hardage, Bob A.

doi:10.1190/int-2015-0002.1

Cited by 14 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…P-P and SV-P waves arrive at VSP receiver stations at different angles. Therefore, optimal rotation of geophones, done so that there is maximum reflected energy of each desired mode, provides the opportunity to enhance one type of events and weaken the other type Li and Hardage, 2015). However, such optimal geophone rotation may occur deficient and desired events may still be contaminated by interfering modes.…”

Section: Sv-p and Sv-sv Mode Separationmentioning

confidence: 97%

“…separated SV-P and P-P reflections recorded in VSP data by applying an additional inclination-angle rotation to data that had been rotated to get maximum power of direct-P arrivals. Li and Hardage (2015) developed a more appropriate rotation approach and performed time-variant receiver rotation for VSP data acquired across a Marcellus Shale prospect. They compared the SV-P image with a surface-based P-SV profile and demonstrated that these two modes were equivalent.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

SV-P and S-S imaging at a CO2 storage site using vertical seismic profiling data

Klokov

Hardage

2016

International Journal of Greenhouse Gas Control

View full text Add to dashboard Cite

a b s t r a c tOnly compressional (P) waves are typically used to illuminate the geology of land-based carbon dioxide (CO 2 ) storage sites because the costs associated with horizontal-force vibrators needed to emit shear (S) waves deters the use of that mode. However, S-waves are highly sensitive to fractures and provide clues to the porosity and permeability of the reservoir and seal. Shear wave energy may also be produced by vertical-force vibrators, and the resulting up-going direct-S waves may be recorded either as reflected S-S modes or as converted SV-P modes. These two data components can contribute information not available in P-wave components. In particular, the SV-P mode makes converted-wave analysis possible when working with seismic data generated by vertical vibrators and recorded with only vertical geophones.In this paper, we present a method for extracting S-waves emitted by vertical-force vibrators. This is a low-cost opportunity for full seismic wavefield analysis that enhances understanding of geologic reservoirs. We illustrate S-wave seismic imaging with a vertical seismic profiling dataset acquired at a CO 2 storage site in Decatur, Illinois. We discuss a data processing flow that segregates direct-S modes. We compare SV-P and S-S images generated by a vertical vibrator source with P-P, P-SV, and P-SH images -the typical images made with vertical-vibrator sources. All images appear consistent and complement each other, indicating the method presented here allows the use of S-waves in CO 2 storage site screening without requiring horizontal geophones.

show abstract

Section: Sv-p and Sv-sv Mode Separationmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

SV-P and S-S imaging at a CO2 storage site using vertical seismic profiling data

Klokov

Hardage

2016

International Journal of Greenhouse Gas Control

View full text Add to dashboard Cite

show abstract

Seismic characterization and monitoring of a deep CO2 storage reservoir with 3D VSP using direct shear waves

Klokov

Hardage

2017

Journal of Petroleum Science and Engineering

View full text Add to dashboard Cite

SV-P: A potential viable alternative to mode-converted P-SV seismic data for reservoir characterization

Gupta

Hardage

2017

Interpretation

View full text Add to dashboard Cite

P-SV seismic acquisition requires 3C geophones and thus has greater cost compared with conventional P-P data. However, some companies justify this added cost because P-SV data provide an independent set of S-wave measurements, which can increase the reliability of subsurface property estimation. This study investigates SV-P data generated by a vertical vibrator and recorded by vertical geophones as a cost-effective alternative to traditional P-SV data. To evaluate the efficacy of the SV-P mode relative to the P-P and P-SV modes, multicomponent seismic data from Wellington Field, Kansas, were interpreted. P-P amplitude variation with offset (AVO) gathers and stacked SV-P seismic data were jointly inverted to estimate elastic properties, which were compared with the estimates obtained from joint inversion of P-P AVO gathers, stacked P-SV seismic data, and inversion of P-P AVO gathers data. All inversions provide identical P-impedance characteristics. However, a significant improvement in S-impedance estimates is observed when P-P and converted wave data (either SV-P or P-SV) are inverted jointly, compared with P-P inversion results alone. In the Arbuckle interval, which is being considered for [Formula: see text] injection, use of converted-wave data clearly demarcates the Middle Arbuckle baffle zone and the Lower Arbuckle injection zone, with the latter having low P- and S-impedances. These observations, although consistent with other well-based geologic evidence, are absent on P-P-only inversion results. No major difference in the inversion results is seen when SV-P data are used instead of P-SV data. Moreover, we determine for the first time by comparing the SV-P image obtained from vertical-vibrator data and the SV-P image obtained from horizontal-vibrator data that both data image subsurface geology equivalently, except for the important distinction that the former contains more valuable higher frequencies than the latter. Because legacy P-wave data can be reprocessed to extract the SV-P mode, using SV-P data can provide a unique way to perform multicomponent seismic analysis.

show abstract

SV-P extraction and imaging for far-offset vertical seismic profile data

Cited by 14 publications

References 4 publications

SV-P and S-S imaging at a CO2 storage site using vertical seismic profiling data

SV-P and S-S imaging at a CO2 storage site using vertical seismic profiling data

Seismic characterization and monitoring of a deep CO2 storage reservoir with 3D VSP using direct shear waves

SV-P: A potential viable alternative to mode-converted P-SV seismic data for reservoir characterization

Contact Info

Product

Resources

About