哥伦比亚Velasquez油田始新统Guaduas组沉积微相与剩余油分布
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摘要
为了查明Velasquez油田剩余油分布,挖掘剩余油潜力,对研究区的沉积环境、沉积微相及其特征进行研究,建立准确的储集层模型。根据岩芯观察,对构造特征、岩性特征、粒度特征和地震响应特征进行分析。利用均方根振幅属性预测砂体厚度,并以此对沉积微相展布进行分析,讨论沉积微相与剩余油分布的关系。研究结果表明:48-45断块区Guaduas组为一套辫状河三角洲沉积,并划分为辫状河三角洲平原、前缘2个亚相和辫状河道、泛滥平原、水下分流河道、河口坝、席状砂、支流间湾6个微相;Guaduas组沉积时期经历了湖平面升—降—升的演化;研究区油层水淹程度和剩余油分布明显受沉积微相制约,辫状河道和水下分流河道顶部、河口坝侧缘、席状砂砂体沉积区剩余油相对富集,是油田下一步开发调整和剩余油挖潜的主体。
To get a proper knowledge of remaining oil distribution and improving oil recovery rate in Velasquez oilfield,the core observation,depositional structure,lithologic,granularity and seismic response characteristics were analyzed.The sedimentary condition,sedimentary micro-facies and their features were studied,and the model of proper reservoir was built.The predict sandbodies' thickness was predicted using the root-mean-square amplitude,and through it the micro-facies distribution was discussed.The relationship between microfacies and remaining oil distribution was discussed.The results show that the depositional environment of the Guaduas formation in 48-45 fault block belongs to braid delta deposit.The depositional facies include two subfacies(braided river delta plain and braided river delta front) and six micro-facies(braided channel,flood plain,subaqueous distributary channel,mouth bar,sheet sand and interdistributory bay).The lake level has rise-fall-rise during Guaduas formation sedimentary period.Reservoir water flooding degree and remaining oil distribution are controlled by micro-facies.And the remanent oil is relatively concentrated in the top of braided channel and subaqueous distributary channel,the side of mouth bar and sheet sand,which are the major targets of next development adjustment and remaining oil potential tapping.
To get a proper knowledge of remaining oil distribution and improving oil recovery rate in Velasquez oilfield,the core observation,depositional structure,lithologic,granularity and seismic response characteristics were analyzed.The sedimentary condition,sedimentary micro-facies and their features were studied,and the model of proper reservoir was built.The predict sandbodies' thickness was predicted using the root-mean-square amplitude,and through it the micro-facies distribution was discussed.The relationship between microfacies and remaining oil distribution was discussed.The results show that the depositional environment of the Guaduas formation in 48-45 fault block belongs to braid delta deposit.The depositional facies include two subfacies(braided river delta plain and braided river delta front) and six micro-facies(braided channel,flood plain,subaqueous distributary channel,mouth bar,sheet sand and interdistributory bay).The lake level has rise-fall-rise during Guaduas formation sedimentary period.Reservoir water flooding degree and remaining oil distribution are controlled by micro-facies.And the remanent oil is relatively concentrated in the top of braided channel and subaqueous distributary channel,the side of mouth bar and sheet sand,which are the major targets of next development adjustment and remaining oil potential tapping.
引文
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[2]Mcpherson J G,Shammugam G,Moiola R J.Fan-Delta andBraid Deltas:Varieties of coarse grained deltas[J].GeologicalSoc America Bulletin,1987,99(3):331-340.
[3]Dela A L,Karen E W,Nancy A V,et al.Sedimentation in a lowaccommodation setting:Nonma-rine(Cretaceous)Mannville andmarine(Jurassic)Ellis groups,Manyberries field,southeasternAlberta[J].AAPG Bulletin,2004,88(10):1391-1418.
[4]邓宏文,钱凯.关于间歇性涨缩湖盆沉积作用的几点认识(主要以柴达木盆地早第三纪沉积为例)[J].沉积学报,1987,5(2):91-101.DENG Hong-wen,QIAN Kai.Some knowledge on thesedimentation of intermittently expanding and shrinking lake basin taking Oligocene sediments of qaidam basin as example[J].Acta Sedimentologica Sinica,1987,5(2):91-101.
[5]李东海,姜在兴,李继山.济阳坳陷东部新近系馆陶组下段辫状河三角洲沉积研究[J].石油大学学报:自然科学版,2003,27(3):10-13.LI Dong-hai,JIANG Zai-xing,LI Ji-shan.Braided river deltasedimentary facies of lower Guantao formation of the neogene ineastern Jiyang depression[J].Journal of the University ofPetroleum,China:Edition of Natural Science,2003,27(3):10-13.
[6]饶政,姚鹏翔,张春光.准噶尔盆地石南31井区下白垩统清水河组一段辫状河三角洲相及沉积演化[J].古地理学报,2008,10(1):43-51.RAO Zheng,YAO Peng-xiang,ZHANG Chun-guang.Braidedfluvial delta facies and sedimentary evolution of the Member 1of Qingshuihe Formation of Lower Cretaceous in Shinan 31wellblock,Junggar Basin[J].Journal of Palaeogeography,2008,10(1):43-51.
[7]蒲仁海.前积反射的地质解释[J].石油地球物理勘探,1994,29(4):490-497.Pu Ren-hai.Geological interpretation of progradationalreflections[J].Petroleum Exploration and Development,1994,29(4):490-497.
[8]Fontame J M,Cussey R,Lacaze J,et al.Seismic interpretation ofCorbonate depositional environments[J].AAPG Bulletin,1987,71(3):281-297.
[9]朱筱敏,康安,王贵文,等.三塘湖盆地侏罗系辫状河三角洲沉积特征[J].石油大学学报:自然科学版,1998,22(1):14-17.ZHU Xiao-min,KANG An,WANG Gui-wen,et al.Sedimentarycharacteristics of Jurassic braid delta in Santanghu basin[J].Journal of the University of Petroleum,China:Edition of NaturalScience,1998,22(1):14-17.
[10]Jo H R,Chough S K.Architectural analysis of fluvial sequencesin the northwestern part of Kyongsang Basin(early Createous),SE Korea[J].Sedimentary Geology,2001,144(3):307-334.
[11]张颖.沾化凹陷罗家—垦西地区砂砾岩体沉积相类型与时空展布特征[J].油气地质与采收率,2006,13(5):35-40.ZHANG Ying.Type and time-space distribution of the glutenitebody in Luojia-Kenxi area of Zhanhua depression[J].PetroleumGeology and Recovery Efficiency,2006,13(5):35-40.
[12]韩会平,侯云东,武春英.鄂尔多斯盆地靖边气田山西组23段沉积相与砂体展布[J].油气地质与采收率,2007,14(6):50-55.HAN Hui-ping,HOU Yun-dong,WU Chun-ying.Sedimentaryfacies and sand body distribution of the Member 23 of ShanxiFormation in Jingbian Gasfield,Ordos Basin[J].PetroleumGeology and Recovery Efficiency,2007,14(6):50-55.
[13]Cooper M A,Addison F T,Alvarez A.Basin development andtectonic history of the Llanos Basin,Eastern Cordillera,andMiddle Magdalena Valley,Colombia[J].AAPG Bulletin,1995,79(10):1421-1443.
[14]熊运斌,杨建文,陈云英,等.文南油田开发中后期沉积微相精细研究[J].石油勘探与开发,2003,30(2):64-67.XIONG Yun-bin,YANG Jian-wen,CHEN Yun-ying,et al.Thefine studies of depositional micro-facies on the middle-postdevelopment stages in Wennan oilfield[J].Petroleum Explorationand Development,2003,30(2):64-67.
[15]李海燕,彭仕宓.文留油田文72断块开发中后期沉积微相研究[J].吉林大学学报:地球科学版,2007,37(4):710-716.LI Hai-yan,PENG Shi-mi.Study on sedimentary microfaciesduring the middle-late development stages of Wen 72 block inWenliu oilfield[J].Journal of Jilin University:Earth ScienceEdition,2007,37(4):710-716.
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