川西致密碎屑岩低电阻率气层成因分析与测井识别.pdf

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1、第38卷第2期测井技术Vo1．38No．22014年4月WELLI(X×INGTECHN0L0GYApr2014文章编号：1004—1338(2014)02—0179—06川西致密碎屑岩低电阻率气层成因分析与测井识别徐炳高，李阳兵，季风玲，王志文(中石化西南石油工程有限公司测井分公司，四川成都610100)摘要：川I西地区天然气勘探逐渐从背斜构造向低部位向斜构造部位的马井一什邡地区延伸，低构造部位储层测井响应特征特殊，储层电阻率普遍较低，容易将气层误判为水层，测井识别难度大。分析了造成储层低电阻率原因，主要影响因素是岩石粒度细、束缚水含量高、砂泥岩薄互层及低部位构造，次要影响因素是黏

2、土矿物的附加导电性、部分储层存在导电矿物和低角度裂缝。开展了低电阻率气层识别方法研究，在沉积微相分析基础上进行测井响应特征研究，重点利用中子孔隙度挖掘效应识别气层；利用可动水饱和度指标对气层进行判别。低电阻率储层分布受沉积微相控制，处于滨浅湖沙坝微相区。关键词：测井解释；向斜构造；低电阻率；气层；测井识别；川西地区中图分类号：P631．84文献标识码：ADoi：10．3969／j．issn．1004—1338．2014．02．009TheGenesisAnalysisandLoggingIdentificationforTightClasticRockwiththeLow-resis

3、tivityGasinWesternSichuanXUBinggao，LIYangbing，JIFengling，WANGZhiwen(WellLoggingBranch，SouthwestPetroleumEngineeringCompanyLTD．，SINOPEC，Chengdu，Sichuan610100，China)Abstract：InWesternSichuanarea，naturalgasexplorationisgraduallyextendedfromanticlinetothelowerlocationofthesynclineShifang—Majingarea

4、．Theloggingresponsecharacteristicsofreservoirarespecialinthelowerpartofthestructure，thereservoirresistivityisgenerallylowerandgaslayeriseasilymistakenaswaterlayer，SOitisdifficulttoidentifythereservoir．Therefore，wecarryouttheresearchofloggingidentificationtechniqueforgasreservoirwithlowresistivi

5、ty．Weanalyzethecauseoflowresistivityreservoirandconfirmedthemaininfluencingfactorsincludefineparticlesizeofrock，highvolumeofboundwater，thininterbedsofsandstoneandmudstoneandlowerlocationofthestructure，thesecondaryfactorsincludetheadditionalconductivityofclayminerals，partreservoirswithconductive

6、mineralsandlowanglefractures．Onthisbasis，wecarryouttheidentificationmethodresearchoflow—resistivitygasreservoir．Basedontheanalysisofthesedimentarymicrofacies，wecarryouttheresearchofwellloggingresponsecharacteristics，useneutronporosityexcavationeffecttoidentifygasreservoirandusetheindicatorsofmo

7、vablewatersaturationtodistinguishthegaslayer．Lowresistivityreservoirdistributioncontrolledbysedimentarymicrofacies，andmainlyliesinshoreshallowlakesanddammicrofaeieszone．Keywords：loginterpretation，synclinestructure，lowresistivity，g