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1、·48·天然氣工業(yè)2013年9月基于巖石物理模型和疊前彈性參數(shù)反演的孔隙度計(jì)算蔡涵鵬1,22,31112賀振華何光明鄒文龍浩高剛1.中國(guó)石油川慶鉆探工程公司地球物理勘探公司2.“油氣藏地質(zhì)及開(kāi)發(fā)工程”國(guó)家重點(diǎn)實(shí)驗(yàn)室·成都理工大學(xué)3.“地球探測(cè)與信息技術(shù)”教育部重點(diǎn)實(shí)驗(yàn)室·成都理工大學(xué)蔡涵鵬等.基于巖石物理模型和疊前彈性參數(shù)反演的孔隙度計(jì)算.天然氣工業(yè),2013,33(9):48-52.摘要地層孔隙度參數(shù)的準(zhǔn)確求取是油氣勘探中儲(chǔ)層預(yù)測(cè)、儲(chǔ)層描述、儲(chǔ)量估算和油氣藏綜合研究的一項(xiàng)關(guān)鍵性技術(shù),而運(yùn)用常規(guī)方法對(duì)孔隙度進(jìn)行計(jì)算存在精度不高、物理意義不明確等問(wèn)題。為此,從巖石物
2、理的基本理論和巖石物理測(cè)試數(shù)據(jù)出發(fā),在合理的假設(shè)前提下,以Gassmann方程和Eshelby-Walsh方程為基礎(chǔ),推導(dǎo)和建立了利用高信噪比地震資料進(jìn)行疊前彈性參數(shù)反演來(lái)計(jì)算地層巖石孔隙度的數(shù)學(xué)模型。選取實(shí)際資料的應(yīng)用結(jié)果表明:①利用新模型可以提高碳酸鹽巖儲(chǔ)層孔隙度精確度約10%;②能夠有效地計(jì)算預(yù)測(cè)地層孔隙度的縱橫向展布,且符合地質(zhì)、鉆井認(rèn)識(shí)規(guī)律;③利用地震資料疊前彈性參數(shù)反演獲得的橫波速度和體積密度剖面縱向分辨率較縱波速度剖面高,在此基礎(chǔ)上開(kāi)展的孔隙度計(jì)算能夠提高孔隙度剖面的縱向分辨率。該數(shù)學(xué)模型提供的孔隙度數(shù)據(jù)為后期的鉆井部署、儲(chǔ)量估計(jì)、油氣藏描述等研究提
3、供了技術(shù)支撐。關(guān)鍵詞孔隙度彈性參數(shù)反演Gassmann方程Eshelby-Walsh方程縱波橫波密度壓縮系數(shù)DOI:10.3787/j.issn.1000-0976.2013.09.008Porosityestimationbasedonpetrophysicalmodelandprestackelasticinversion1,2,HeZhenhua2,3,HeGuangming1,ZouWen1,LongHao1,GaoGang2CaiHanpeng(1.GeophysicalExplorationCompany,ChuanqingDrillingEngine
4、eringCo.,Ltd.,CNPC,Chengdu,Si-chuan610213,China;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation∥Cheng-duUniversityofTechnology,Chengdu,Sichuan610059,China;3.KeyLaboratoryofEarthExplorationandInformationTechnology,MinistryofEducation∥ChengduUniversityofTechnology,Chengdu
5、,Si-chuan610059,China)NATUR.GASIND.VOLUME33,ISSUE9,pp.48-52,9/25/2013.(ISSN1000-0976;InChinese)Abstract:Accurateestimationofporosityiscriticaltoreservoirprediction,reservoircharacterization,reservesestimation,andcom-prehensivestudyofoil/gasreservoirs.However,conventionalporosityestima
6、tionmethodshavetheshortagesoflowaccuracyandambiguityofphysicalmeanings.Basedonthebasictheoriesofpetrophysicsandgeophysicaltestdataandrationalassumptions,amathematicalmodelwasdeducedandestablishedbyusingtheGassmannandEshelby-Walshequations.Thismodelcanbeusedtocalculaterockporositythrou
7、ghpre-stackelasticinversionofseismicdatawithhighsignal-to-noiseratios.Applicationofthisnewmodeltorealdatashowsthatitcanimprovetheaccuracyofcarbonatereservoirporosityestimationbyabout10%,andeffectivelypredicttheverticalandhorizontaldistributionofporosity.TheverticalresolutionsofS-wavev
8、eloci