{"title":"多分量偏置VSP比例模型研究","authors":"D.R Pant, S.A Greenhalgh","doi":"10.1016/0016-7142(90)90004-C","DOIUrl":null,"url":null,"abstract":"<div><p>The key to obtaining improved knowledge of the subsurface seismic structure lies in the use of multicomponent recording (multi-directional sources and triaxial detection) and vector (elastic) wavefield imaging. To this end we have assembled a two-dimensional, biaxial physical seismic model system.</p><p>The laboratory facility has been used to acquire vector seismic data over a very simple reflecting structure for both VSP and MSP (inverted VSP) array configurations. Controlled direction reception (CDR) filtering of the data yields four sections for interpretation: upgoing P, downgoing P, upgoing S and downgoing S.</p><p>The model experiment has revealed an interesting mode conversion from Rayleigh wave (or tube wave, when extended to the field situation) to scattered S wave, which dominates the seismic section. This wave could be a troublesome form of noise on scalar seismograms, but it can be eliminated by means of CDR to pass the P waves only. Alternatively, it can be viewed as a useful multicomponent diagnostic for detecting fractures or other impedance boundaries intersecting the borehole.</p></div>","PeriodicalId":100579,"journal":{"name":"Geoexploration","volume":"26 3","pages":"Pages 191-212"},"PeriodicalIF":0.0000,"publicationDate":"1990-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0016-7142(90)90004-C","citationCount":"4","resultStr":"{\"title\":\"A multicomponent offset VSP scale model investigation\",\"authors\":\"D.R Pant, S.A Greenhalgh\",\"doi\":\"10.1016/0016-7142(90)90004-C\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The key to obtaining improved knowledge of the subsurface seismic structure lies in the use of multicomponent recording (multi-directional sources and triaxial detection) and vector (elastic) wavefield imaging. To this end we have assembled a two-dimensional, biaxial physical seismic model system.</p><p>The laboratory facility has been used to acquire vector seismic data over a very simple reflecting structure for both VSP and MSP (inverted VSP) array configurations. Controlled direction reception (CDR) filtering of the data yields four sections for interpretation: upgoing P, downgoing P, upgoing S and downgoing S.</p><p>The model experiment has revealed an interesting mode conversion from Rayleigh wave (or tube wave, when extended to the field situation) to scattered S wave, which dominates the seismic section. This wave could be a troublesome form of noise on scalar seismograms, but it can be eliminated by means of CDR to pass the P waves only. Alternatively, it can be viewed as a useful multicomponent diagnostic for detecting fractures or other impedance boundaries intersecting the borehole.</p></div>\",\"PeriodicalId\":100579,\"journal\":{\"name\":\"Geoexploration\",\"volume\":\"26 3\",\"pages\":\"Pages 191-212\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1990-04-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0016-7142(90)90004-C\",\"citationCount\":\"4\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Geoexploration\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/001671429090004C\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geoexploration","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/001671429090004C","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
A multicomponent offset VSP scale model investigation
The key to obtaining improved knowledge of the subsurface seismic structure lies in the use of multicomponent recording (multi-directional sources and triaxial detection) and vector (elastic) wavefield imaging. To this end we have assembled a two-dimensional, biaxial physical seismic model system.
The laboratory facility has been used to acquire vector seismic data over a very simple reflecting structure for both VSP and MSP (inverted VSP) array configurations. Controlled direction reception (CDR) filtering of the data yields four sections for interpretation: upgoing P, downgoing P, upgoing S and downgoing S.
The model experiment has revealed an interesting mode conversion from Rayleigh wave (or tube wave, when extended to the field situation) to scattered S wave, which dominates the seismic section. This wave could be a troublesome form of noise on scalar seismograms, but it can be eliminated by means of CDR to pass the P waves only. Alternatively, it can be viewed as a useful multicomponent diagnostic for detecting fractures or other impedance boundaries intersecting the borehole.