塔河油田缝洞型碳酸盐岩油藏剩余油分布特征.pdf

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1、2012年12月大庆石油地质与开发DeC．，2012第31卷第6期PetroleumGeologyandOilfieldDevelopmentinDaqingV01．31No．6DOI：10．3969／J．ISSN．1000．3754．2012．06．011塔河油田缝洞型碳酸盐岩油藏剩余油分布特征康志江崔书岳(1．中国地质大学资源学院，湖北武汉430074；2．中国石化石油勘探开发研究院，北京100083)摘要：塔河油田缝洞型碳酸盐岩油藏储集体三i三要由大型溶洞、裂缝及溶孔组成，其中大型溶洞是主要的储油与

2、产油空间。大型溶洞内流体流动为自由流，与砂岩孔隙中的流体流动具有较大的差别。溶洞内油水两相流时不存在固体介质对流体流动阻力，油水间的重力作用表现突出，油水间重力分异迅速，油水界面清晰。溶洞之间由裂缝相连通，耦合后流动更加复杂，裂缝内流体流动表现为高速达西流动，底水沿裂缝水窜速度快。结合生产动态与数值模拟研究，揭示了5种缝洞型油藏复杂介质剩余油分布类型，即井旁溶洞剩余油、溶洞顶部剩余油、缝洞剩余油、下层溶洞剩余油和裂缝上部剩余油等，为塔河油田开发调整及提高采收率提供了地质基础。关键词：塔河油田；缝洞型碳酸盐

3、岩油藏；剩余油分布；数值模拟中图分类号：TE327文献标识码：A文章编号：1000-3754(2012)06-0054-05DISTIUBUTIONCHARACTERISTICSOFTHEREMAINEDOILINTAHEFRACTURED．CAVECARBoNATEoILRESERVoIRSKANGZhijiang，CUIShuyue(1．ResourcesCollegeofChinaUniversityofGeosciences，Wuhan430074，China；2．ResearchInstitut

4、eofPetroleumExplorationandDevelopment，SINOPEC，Beijing100083，China)Abstract：Fractured．cavecarbonatereservoirsofTaheOilfieldaremainlycomposedofvastkarstcaves，fracturesanddissolvedvugs，andtheformeristheprincipalspacetoreserveandproduceoil．Theliquidflowinthea

5、bovekindofreservoirbelongstofreeone，whichpossessesmuchsharpercontrastwiththeflowinsandstoneporesandfractures．Thereisnotanyflowresistancetoflowliquidsforthesolidmediaintheoilandwatertwo—phaseflowinthekarstcaves，thegravitybetweentheoilandwaterdisplayswellan

6、dthetheirgravitydifferentiationisfast，andmoreovertheinterfacebetweenthemisprettyclear．Thecavesareconnectedbythefractures，aftertheintegration，theflowbecomesrathercomplicated：theliquidflowwithinthefracturesischaracterizedbyhigh—speedDarcyflow-thewatercrossi

7、ngofthebottomwateralongthefracturesisratherswift．Combiningwiththeproductionperform-ancesandtheresearchesofthenumericalsimulation，fivekindsofremainedoildistributionaredisclosedforthe’fractured—caveoilreservoirswithcomplexmedia：karst—caveremainedoilnearbyth

8、ewell，theoilremainedonthetopofthekarstcaves，fracturedcaveremainedoil，theoilremainedinthelowerkarstcavesandtheoilremainedontheupperpartofthefractures．Alltheachievementsobtainedabovehaveprovidedthegeologicalfoundation