Effect of gas saturation on P-wave velocity in tight sandstone
By measuring the variation of the P- and S-wave velocities of tight sandstone samples under water saturation, it was confirmed that with the decrease in water saturation, the P-wave velocity first decreased and then increased. The variation in velocity was influenced by the sandstone’s porosity. The...
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| Veröffentlicht in: | Applied geophysics 2024-09, Vol.21 (3), p.487-495 |
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| creator | Pan, Bao-Zhi Zhou, Wei-Yi Guo, Yu-Hang Fang, Chun-Hui Zhang, Li-Hua |
| description | By measuring the variation of the P- and S-wave velocities of tight sandstone samples under water saturation, it was confirmed that with the decrease in water saturation, the P-wave velocity first decreased and then increased. The variation in velocity was influenced by the sandstone’s porosity. The commonly used Gassmann equation based on fluid substitution theory was studied. Comparing the calculated results with the measured data, it was found that the Gassmann equation agreed well with the measured data at high water saturation, but it could not explain the bending phenomenon of P-wave velocity at low saturation. This indicated that these equations could not accurately describe the relationship between fluid content and rock acoustic velocity. The reasons for this phenomenon were discussed through Taylor’s expansion. The coefficients of the fitting formula were calculated and verified by fitting the measured acoustic velocity changes of the cores. The relationship between P-wave velocity and saturation was discussed, which provides experimental support for calculating saturation using seismic and acoustic logging data. |
| doi_str_mv | 10.1007/s11770-023-1005-3 |
| format | Article |
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The variation in velocity was influenced by the sandstone’s porosity. The commonly used Gassmann equation based on fluid substitution theory was studied. Comparing the calculated results with the measured data, it was found that the Gassmann equation agreed well with the measured data at high water saturation, but it could not explain the bending phenomenon of P-wave velocity at low saturation. This indicated that these equations could not accurately describe the relationship between fluid content and rock acoustic velocity. The reasons for this phenomenon were discussed through Taylor’s expansion. The coefficients of the fitting formula were calculated and verified by fitting the measured acoustic velocity changes of the cores. 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Geophys</addtitle><description>By measuring the variation of the P- and S-wave velocities of tight sandstone samples under water saturation, it was confirmed that with the decrease in water saturation, the P-wave velocity first decreased and then increased. The variation in velocity was influenced by the sandstone’s porosity. The commonly used Gassmann equation based on fluid substitution theory was studied. Comparing the calculated results with the measured data, it was found that the Gassmann equation agreed well with the measured data at high water saturation, but it could not explain the bending phenomenon of P-wave velocity at low saturation. This indicated that these equations could not accurately describe the relationship between fluid content and rock acoustic velocity. The reasons for this phenomenon were discussed through Taylor’s expansion. The coefficients of the fitting formula were calculated and verified by fitting the measured acoustic velocity changes of the cores. The relationship between P-wave velocity and saturation was discussed, which provides experimental support for calculating saturation using seismic and acoustic logging data.</description><subject>Acoustic velocity</subject><subject>Acoustics</subject><subject>Data logging</subject><subject>Deformation</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Geophysics/Geodesy</subject><subject>Geotechnical Engineering & Applied Earth Sciences</subject><subject>Logging</subject><subject>P waves</subject><subject>Porosity</subject><subject>S waves</subject><subject>Sandstone</subject><subject>Saturation</subject><subject>Sedimentary rocks</subject><subject>Seismic velocities</subject><subject>Seismic wave velocities</subject><subject>Velocity</subject><subject>Wave velocity</subject><issn>1672-7975</issn><issn>1993-0658</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><recordid>eNp1kE9LAzEQxYMoWKsfwFvAc3SSNP8ugpRahYIe9BzSbVK31E1NspV-e1NW8CQMzDz4vZnhIXRN4ZYCqLtMqVJAgHFStSD8BI2oMZyAFPq0zlIxoowS5-gi5w2A5ExORuh-FoJvCo4Br13G2ZU-udLGDtd6Jd9u7_Heb2PTlgNuO1za9UepWLfKJXb-Ep0Ft83-6reP0fvj7G36RBYv8-fpw4I0TOpCVCOMCUEECZo7x3R9TaulVCbA0jhgwJRkmvGV8RPDZGBcCO-DUZxyLSZ8jG6GvbsUv3qfi93EPnX1pOWUgjZCgKoUHagmxZyTD3aX2k-XDpaCPcZkh5hsjemoheXVwwZPrmy39ulv8_-mH3oVZ-4</recordid><startdate>20240901</startdate><enddate>20240901</enddate><creator>Pan, Bao-Zhi</creator><creator>Zhou, Wei-Yi</creator><creator>Guo, Yu-Hang</creator><creator>Fang, Chun-Hui</creator><creator>Zhang, Li-Hua</creator><general>Springer Berlin Heidelberg</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7UA</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><scope>L7M</scope></search><sort><creationdate>20240901</creationdate><title>Effect of gas saturation on P-wave velocity in tight sandstone</title><author>Pan, Bao-Zhi ; Zhou, Wei-Yi ; Guo, Yu-Hang ; Fang, Chun-Hui ; Zhang, Li-Hua</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c268t-7c599ff5f6083aa2819987b679f0b9a0202762823d9e4926f2355eef973138543</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>Acoustic velocity</topic><topic>Acoustics</topic><topic>Data logging</topic><topic>Deformation</topic><topic>Earth and Environmental Science</topic><topic>Earth Sciences</topic><topic>Geophysics/Geodesy</topic><topic>Geotechnical Engineering & Applied Earth Sciences</topic><topic>Logging</topic><topic>P waves</topic><topic>Porosity</topic><topic>S waves</topic><topic>Sandstone</topic><topic>Saturation</topic><topic>Sedimentary rocks</topic><topic>Seismic velocities</topic><topic>Seismic wave velocities</topic><topic>Velocity</topic><topic>Wave velocity</topic><toplevel>online_resources</toplevel><creatorcontrib>Pan, Bao-Zhi</creatorcontrib><creatorcontrib>Zhou, Wei-Yi</creatorcontrib><creatorcontrib>Guo, Yu-Hang</creatorcontrib><creatorcontrib>Fang, Chun-Hui</creatorcontrib><creatorcontrib>Zhang, Li-Hua</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Applied geophysics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Pan, Bao-Zhi</au><au>Zhou, Wei-Yi</au><au>Guo, Yu-Hang</au><au>Fang, Chun-Hui</au><au>Zhang, Li-Hua</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of gas saturation on P-wave velocity in tight sandstone</atitle><jtitle>Applied geophysics</jtitle><stitle>Appl. Geophys</stitle><date>2024-09-01</date><risdate>2024</risdate><volume>21</volume><issue>3</issue><spage>487</spage><epage>495</epage><pages>487-495</pages><issn>1672-7975</issn><eissn>1993-0658</eissn><abstract>By measuring the variation of the P- and S-wave velocities of tight sandstone samples under water saturation, it was confirmed that with the decrease in water saturation, the P-wave velocity first decreased and then increased. The variation in velocity was influenced by the sandstone’s porosity. The commonly used Gassmann equation based on fluid substitution theory was studied. Comparing the calculated results with the measured data, it was found that the Gassmann equation agreed well with the measured data at high water saturation, but it could not explain the bending phenomenon of P-wave velocity at low saturation. This indicated that these equations could not accurately describe the relationship between fluid content and rock acoustic velocity. The reasons for this phenomenon were discussed through Taylor’s expansion. The coefficients of the fitting formula were calculated and verified by fitting the measured acoustic velocity changes of the cores. The relationship between P-wave velocity and saturation was discussed, which provides experimental support for calculating saturation using seismic and acoustic logging data.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1007/s11770-023-1005-3</doi><tpages>9</tpages></addata></record> |
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| language | eng |
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| subjects | Acoustic velocity Acoustics Data logging Deformation Earth and Environmental Science Earth Sciences Geophysics/Geodesy Geotechnical Engineering & Applied Earth Sciences Logging P waves Porosity S waves Sandstone Saturation Sedimentary rocks Seismic velocities Seismic wave velocities Velocity Wave velocity |
| title | Effect of gas saturation on P-wave velocity in tight sandstone |
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