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1、第34卷第4期石油霧劈66屆Vo1.34.No.42012年7月PETRoLEUMGEOLoGY&EXPERIMENTJu1.,2012文章編號:1001—6112(2012)04-0400-06蘇里格地區(qū)致密砂巖地層水賦存狀態(tài)和產(chǎn)出機理探討王曉梅,趙靖舟,劉新社。(1.西北大學地質(zhì)學系,西安710069;2.西安石油大學地球科學與工程學院,西安710065;3.中國石油長慶油田分公司,西安710021)摘要:鄂爾多斯盆地蘇里格氣區(qū)是中國最大的非常規(guī)準連續(xù)型致密砂巖大氣區(qū),該地區(qū)西部和北部上古生界產(chǎn)水普遍,氣藏內(nèi)無統(tǒng)一氣水界面,氣水分布十分復雜。該文以致密砂巖成藏動力學為
2、出發(fā)點,綜合成藏要素、現(xiàn)今儲層微觀孔隙結(jié)構(gòu)和流體的滲流機理,探索了蘇里格地區(qū)的地層水賦存狀態(tài)和產(chǎn)出機理。研究認為,蘇里格地區(qū)氣、水分布規(guī)律復雜性的主要原因即生烴膨脹力和儲層毛細管阻力的差異。研究區(qū)致密砂巖儲層地層水存在束縛水、毛細管水和自由水3種賦存狀態(tài),束縛水區(qū)基本位于生氣強度大的東部地區(qū),試氣井主要為產(chǎn)氣井;毛細管水基本分布在生氣強度小的西部和北部地區(qū),試氣井主要為氣水同產(chǎn)井;自由水呈零星分布。關鍵詞:微觀孑L隙結(jié)構(gòu);地層水;致密砂巖;蘇里格地區(qū);鄂爾多斯盆地中圖分類號:TEl33文獻標識碼:AOccurrencestateandproductionmechanism
3、offormationwaterintightsandstonereservoirsofSuligearea,OrdosBasinWangXiaomei一,ZhaoJingzhou,LiuXinshe(1.DepartmentofGeology,NorthwestUniversity,Xi’an,Shaanxi710069,China;2.SchoolofEarthSciencesandEngineering,Xi’anShiyouUniversity,Xi’an,Shaanxi710065,China;3.ChangqingOilf~eldBranchCompany,P
4、etrom,Xi’an,Shaanx71(1021,m)Abstract:TheSuligegasfieldintheOrdosBasinisthelargestunconventionalcontinuoustightsandstonereser—voirinChina.Therearemanywater—producinggaswellsintheUpperPaleozoicstratainthewestandthenorthofSuligeregion,wherethereservoirhasnounitivegas-waterinterface.Theintrin
5、sicrulesofgas-waterdistribu—tionarecomplicatedinthisarea.Basedonthedynamicsofhydrocarbonaccumulationintightsandstone.in—tegratingoilandgasaccumulationelementsandreservoirpresentmicroscopicporestructureandfluidflowmecha—nism,theoccurrencestateandproductionmechanismofformationwaterinSu1.ige
6、regionhavebeendiscussedinthispaper.Ithasbeenshowedthatthemainreasonforcomplicatedgas—-waterdistributionisthedifferencebe—tweenhydrocarbongenerationexpansiveforceandcapillarypressure.Theoccurrencestateofformationwaterinthisareabehaves3types,i.e.ireduciblewater,capillarywaterandfreewater.Th
7、eirreduciblewaterisbasi.callylocatedinthehighgasgenerationintensityareaintheeastofSuligeregion,wherethetestinggaswellsaremainlygas—producingones.ThecapillarywaterisnormallylocatedinthelowgasgenerationintensityareainthewestandthenorthofSuligeregion,wherethetestinggas