Detection of gas reservoirs by the joint use of P- and PS-waves： A case study on the Ordos basin, China-中国期刊网

摘要 Wepresentanexampleofusingconverted-wavesforcharacterizingonshoregasreservoirsintheOrdosbasininNorthwestChina.TheOrdosbasinisthelargestgasprovinceinChina.Themaingasreservoirs(about3300mindepth)areinupperPaleozoicsandstonethathasloworreversedP-waveimpedanceandisimmediatelyaboveacoalseam.ThismakesitverydifficulttoimagethegasreservoirsusingconventionalP-wavedata.Analysisofcore,logandVSPdatashowsaweakPPreflectionbutarelativelystrongPS-convertedwavereflection,orbothstrongPP-andPS-reflectionsbutwithoppositepolarityfromthegasbearingsands,whichindicatesthepotentialofusingPS-wavestoimagethegasreservoirsintheOrdosbasin.Subsequently,thirteenseismiclineswereacquired,processedandinterpretedtoverifythePP-andPS-responses,andtwocorrespondingattributes(PP-andPS-amplituderatioandpolarityratio)areusedtomapthereser-voirsthroughjointPPandPSanalysis.

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Detection of gas reservoirs by the joint use of P- and PS-waves： A case study on the Ordos basin, China

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Detection of gas reservoirs by the joint use of P- and PS-waves： A case study on the Ordos basin, China

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