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1、第33卷第6期地質(zhì)通報(bào)Vo1.33.No.62014年6月GEoLoGICALBULLETINoFCHINAJun.,2014川東南地區(qū)茅口組巖溶古地貌恢復(fù)及特征胡修權(quán),施澤進(jìn),田亞銘。,王長城HUXiu—quan,SHIZe-jin,TIANYa—ruing。,WANGChang—cheng’1.成都理工大學(xué)能源學(xué)院,四川成都610059;2.成都理工大學(xué)油氣藏地質(zhì)及開發(fā)工程國家重點(diǎn)實(shí)驗(yàn)室,四川成都610059;3.成都理工大學(xué)地球科學(xué)院,四川成都6100591.CollegeofEnergyResou
2、rces;ChengduUniversityofTechnology,Chengdu610059,Sichuan,China;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniveniqofTechnology,Chengdu610059,Sichuan,China;3.CollegeofEarthScience,ChengduUniversityofTechnology,Chengdu610059,Sichu
3、an,China摘要:東吳運(yùn)動(dòng)造成茅口組灰?guī)r暴露地表并經(jīng)歷了表生風(fēng)化作用。鉆井揭示,氣藏儲(chǔ)層段與古巖溶所處的位置及強(qiáng)度密切相關(guān),古地貌是控制古巖溶發(fā)育與分布的主要因素。針對(duì)鉆井較少且分布不均、勘探程度不高的川東南地區(qū),將鉆井與地震緊密結(jié)合,分別運(yùn)用殘余厚度法與印模法對(duì)茅口組巖溶古地貌進(jìn)行恢復(fù),結(jié)果對(duì)比發(fā)現(xiàn),這2種方法恢復(fù)出來的古地貌趨勢基本一致。結(jié)合研究區(qū)的地質(zhì)特征和實(shí)際資料,認(rèn)為印模法可信度更高。在古水系特征分析的基礎(chǔ)上,結(jié)合古地質(zhì)圖和鉆井資料,把研究區(qū)劃分為巖溶高地、巖溶斜坡和巖溶盆地,其中巖溶斜坡又
4、可分為巖溶陡坡與巖溶緩坡。研究區(qū)西南巖溶高地與蜀南巖溶高地為同一巖溶高地,呈北西一南東向展布,且相對(duì)蜀南地區(qū)隆起幅度更高。在巖溶斜坡區(qū),地下水以徑流為主,溶蝕孔洞發(fā)育,是巖溶勘探開發(fā)的有利地區(qū)。關(guān)鍵詞:川東南;茅口組;巖溶古地貌;印模法;巖溶斜坡中圖分類號(hào):TEl22.2文獻(xiàn)標(biāo)志碼:A文章編號(hào):1671—2552(2014)06—0874—09HuXQ,ShiZJ,TianYM,WangCC.TherestorationofkarstancientlandformoftheMaokouFormationi
5、nsoutheasternSichuanbasin.GeologicalBulletinofChina,2014,33(6):874-882Abstract:TheDongwuMovementcausedtheexposureofMaokoulimestoneontheearthSSDrfaceandmadeitexperiencetheSD—pergeneweatheringprocess.Drillingrevealsthatthegasreservoiriscloselyrelatedtothelo
6、cationandintensityofancientlandforms.Palaeogeomorphologyisthemainfactorthatafectsthedevelopmentanddistributionofancientkarst.SoutheasternSichuanbasinhashadlessdrillingandisunevenlydistributed,withinsufficientexploration.Combiningdrillingwithseismicsurvey,
7、theauthorsexqui—sitelyrestoredancientkarstlandformofMaokoubyapplyingtheimpressionmethodandtheresidualmethod.Acomparisonofthesetwomethodsshowthatbothmethodscanrecoverthesamebasictrendpalaeogeomorphology.Accordingtothegeologicalfeaturesandpracticaldataofthe
8、studyarea,theauthorsholdthattheimpressionmethodhashigherrehabihty.Basedonananalysisofthean—cientwatersystem,theauthorsdividedthestudyareaintokarsthighland,karstslopeandkarstbasinbycombiningitwithpaleogeo—logicmapand