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时间:2020-06-03
《苏里格地区致密砂岩地层水赋存状态和产出机理探讨.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第34卷第4期石油雾劈66届Vo1.34.No.42012年7月PETRoLEUMGEOLoGY&EXPERIMENTJu1.,2012文章编号:1001—6112(2012)04-0400-06苏里格地区致密砂岩地层水赋存状态和产出机理探讨王晓梅,赵靖舟,刘新社。(1.西北大学地质学系,西安710069;2.西安石油大学地球科学与工程学院,西安710065;3.中国石油长庆油田分公司,西安710021)摘要:鄂尔多斯盆地苏里格气区是中国最大的非常规准连续型致密砂岩大气区,该地区西部和北部上古生界产水普遍,气藏内无统一气水界面,气水分布十分复杂。该文以致密砂岩成藏动力学为
2、出发点,综合成藏要素、现今储层微观孔隙结构和流体的渗流机理,探索了苏里格地区的地层水赋存状态和产出机理。研究认为,苏里格地区气、水分布规律复杂性的主要原因即生烃膨胀力和储层毛细管阻力的差异。研究区致密砂岩储层地层水存在束缚水、毛细管水和自由水3种赋存状态,束缚水区基本位于生气强度大的东部地区,试气井主要为产气井;毛细管水基本分布在生气强度小的西部和北部地区,试气井主要为气水同产井;自由水呈零星分布。关键词:微观孑L隙结构;地层水;致密砂岩;苏里格地区;鄂尔多斯盆地中图分类号:TEl33文献标识码: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
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