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1、石油勘探與開發(fā)7162011年12月PETR0LEUMEXPLORATIoNANDDEVEL0PMENTVO1.38No.6文章編號:1000—0747(2011)06—0716.09塔中奧陶系優(yōu)質(zhì)儲集層特征及斷裂控制作用羅春樹,楊海軍2一,李江海,謝會文2,黃廣建2(1.北京大學地球與空間科學學院;2.中國石油塔里木油田公司勘探開發(fā)研究院;3.中國地質(zhì)大學(北京))基金項目:國家科技重大專項“塔中碳酸鹽巖礁灘型和層間巖溶型凝析氣藏高效勘探開發(fā)”示范工程(2011ZX05049)摘要:塔中北坡上奧陶統(tǒng)礁灘體和下奧陶統(tǒng)鷹山組風化殼為兩套優(yōu)質(zhì)儲集層,早期分別受臺地邊緣高能相帶和早奧陶世風化殼
2、的控制,后期受到斷裂活動的整體改造。綜合研究認為,塔中北坡奧陶系儲集層的類型和分布規(guī)律均與斷裂活動有關(guān)。塔中奧陶系兩套優(yōu)質(zhì)儲集層受3期重要斷裂運動的控制:早奧陶世末的區(qū)域拉張奠定了塔中I號坡折帶形成的基礎(chǔ),促進了下奧陶統(tǒng)鷹山組風化殼巖溶儲集層的形成及隨后上奧陶統(tǒng)礁灘體的沉積;奧陶紀末的大規(guī)模擠壓運動促使塔中北坡發(fā)育鹽相關(guān)構(gòu)造(沿中寒武統(tǒng)的膏鹽層產(chǎn)生滑脫與鹽拱),斷裂同時改造礁灘體和風化殼儲集層;志留紀末的走滑斷裂活動對奧陶系儲集層的改造有限,卻控制著喜馬拉雅期塔中奧陶系氣侵的部位。圖10表1參12關(guān)鍵詞:碳酸鹽巖;礁灘體;風化殼;塔中I號斷裂;滑脫;鹽拱;走滑斷裂中圖分類號:TEl21.
3、1文獻標識碼:ACharacteristicsofhighqualityOrdovicianreservoirsandcontrollingeffectsoffaultsintheTazhongarea,TarimBasinLuoChunshur,YangHaijun。,一,LiJianghai,XieHuiwen,HuangGuangjian(1.SchoolofEarthandSpaceSciences,PekingUniversity,Beijing100871,China;2.ResearchInstituteofExplorationandDevelopment,PetroCh
4、inaTarimOilfieldCompany,Korla841000,China;3.ChinaUniversityofGeosciences,Beijing100083,China)Abstract:TheexplorationduringrecentyearsinthenorthernslopeoftheTazhongarea,TarimBasin,indicatesthattheOrdovicianstratahavetwosetsofhighqualityreservoir,i.e.theUpperOrdovicianreef-beachbodyandtheYingshanFo
5、rmationweatheringcrustoftheLowerOrdovician,whichwererespectivelycontrolledbyhighenergyfaciesatplatformedgesandearlyOrdovicianweatheringCrustintheearlyperiodandmodifiedbyfaultinginthelaterperiod.ComprehensiveresearchshowsthatthetypesanddistributionrulesofOrdovicianreservoirsintheno.hemslopeoftheTa
6、zhongareaarerelatedtofaulting.ThispaperdemonstratesthecontrollingefectsofthreeperiodsoffaultingontheabovetwosetsofOrdovicianhighqualityreservoirs:(1)TheEarlyOrdovicianregionalextensionlaidthefoundationfortheformationofTazhongNo.1slopebreakandledtotheformationoftheYingshanweatheringcurstkarstreser
7、voirsinLowerOrdovicianandthesubsequentsedimentationofUpperOrdovicianreef-beachbodies;(21TheintensecompressionattheendofEarlyOrdovicianpromotedthedevelopmentofsaltrelatedstructuresintl1enorthernslopefthedetachmentandsal