大庆长垣外围低渗透油藏数值模拟研究
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摘要
大庆长垣外围低渗透Ff区块位于三肇凹陷构造斜坡背景上长期发育形成的鼻状构造F油田北部,采用GPTMode建模软件对Ff区块进行精细建模和油藏数值模拟。数值模拟结果表明,分断块统计油水界面高度,数模模型储量拟合误差由2%减小到1.5%,在其他参数不变的条件下,模型含水率拟合度从46.0%提高到86.1%;采用分微相、分渗透率级别相渗标定的方法可以较准确拟合储层相对渗透率,对于存在多个不同开发阶段油藏,采用独立的相渗曲线,模拟结果更符合实际;Ff区块局部下砂岩组发育同层,开发初期含水率较高,运用相渗-毛管压力曲线相结合,准确描述同层油水分布,更准确地拟合数模初期含水;Ff区块微相剩余储量主要分布在河道相中,纵向剩余储量主要分布在4号、5号、9号及12号层,断块剩余储量主要分布在1号、3号和8号断块,它们为主要挖潜对象;剩余油以注采不完善型、断层遮挡型为主,主要挖潜措施为补孔和压裂。
Low-permeability Ff block on the periphery of Daqing placanticline locates in the north of F Oilfield with nose structure long-time developed under the background of structural slope in Sanzhao Sag.GPTMode modeling software was applied to fine modeling and reservoir numerical simulation in Ff block.The numerical simulation results show that oil-water interface height of each fault block may be counted,matching error of reserves of the model dropped from 2% to 1.5%,and fitting degree of water cut of the model raised from 46.0% to 86.1% under the conditions of other same parameters.The method of relative perme-ability calibration at the level of microfacies and permeability may be applied to matching relative reservoir permeability accurately,and the application of independent relative permeability curve make the simulated re-sults more practical for the oil reservoirs with several development stages.Partial lower sandstone formation in the Ff block was developed at the same layer,and water cut was high at initial development stage.The combination of relative permeability curve and capillary pressure curve can describe the oil-water distribution at the same layer and match initial water cut more accurately.Remaining reserves of the microfacies in the Ff block distribute in channels mainly.Vertical remaining reserves mainly distribute in No.4,5,9 and 12 layers,and remaining reserves of the blocks mainly distribute in No.1,3 and 8 blocks,which are the main potential object.The type of the remaining oil in the Ff block is injection-production incompletion and fault barrier mainly,and the major measures for tapping the potential are reperforating and fracturing.
Low-permeability Ff block on the periphery of Daqing placanticline locates in the north of F Oilfield with nose structure long-time developed under the background of structural slope in Sanzhao Sag.GPTMode modeling software was applied to fine modeling and reservoir numerical simulation in Ff block.The numerical simulation results show that oil-water interface height of each fault block may be counted,matching error of reserves of the model dropped from 2% to 1.5%,and fitting degree of water cut of the model raised from 46.0% to 86.1% under the conditions of other same parameters.The method of relative perme-ability calibration at the level of microfacies and permeability may be applied to matching relative reservoir permeability accurately,and the application of independent relative permeability curve make the simulated re-sults more practical for the oil reservoirs with several development stages.Partial lower sandstone formation in the Ff block was developed at the same layer,and water cut was high at initial development stage.The combination of relative permeability curve and capillary pressure curve can describe the oil-water distribution at the same layer and match initial water cut more accurately.Remaining reserves of the microfacies in the Ff block distribute in channels mainly.Vertical remaining reserves mainly distribute in No.4,5,9 and 12 layers,and remaining reserves of the blocks mainly distribute in No.1,3 and 8 blocks,which are the main potential object.The type of the remaining oil in the Ff block is injection-production incompletion and fault barrier mainly,and the major measures for tapping the potential are reperforating and fracturing.
引文
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[2]赵国忠,杨清彦,唐文锋,等.大庆长垣外围低渗透油田开发机理[J].大庆石油地质与开发,2009,28(5):126-133.
[3]李玉梅,陈开远,赵玉欣.提高油藏数值模拟精度的对策研究[J].石油天然气学报,2010,32(3):350-353.
[4]朱焱,谢进庄,杨为华,等.提高油藏数值模拟历史拟合精度的方法[J].石油勘探与开发,2008,35(2):225-229.
[5]张铁富.宋芳屯油田精细地质及井网加密调整试验技术研究[D].大庆:大庆石油学院,2007.
[6]周贤文,汤达帧,张春书.精细油藏数值模拟研究现状及发展趋势[J].特种油气藏,2008,15(4):1-6.
[7]张剑波,李谢清,石阳,等.油藏数值模拟中地质模型的建模流程与方法[J].吉林大学学报:地球科学版,2015,45(3):860-868.
[8]杨承林,许春娥,石书灿.应用数值模拟法研究复杂断块油藏剩余油分布[J].断块油气田,2007,14(2):36-38.
[9]王曙光,赵国忠,余碧君.大庆油田油水相对渗透率统计规律及其应用[J].石油学报,2005,26(3):78-85.
[10]康丽侠,李玉强.相渗曲线在精细油藏描述中的应用[J].石油化工应用,2013,32(7):34-37.
[11]周志军,薛江龙,赵立斌.数值模拟拟合精度方法研究———以龙虎泡油田为例[J].岩性油气藏,2016,28(1):102-105.
[12]母长河,梁秀丽,马利民.萨北开发区油水同层测井解释方法[J].大庆石油地质与开发,2006,25(6):112-114.
[13]王敏,孙建孟,赖富强,等.低闭合油藏油水同层储层含水饱和度新模型[J].西南石油大学学报:自然科学版,2010,32(1):27-32.
[14]彭彩珍,李治平,贾闽惠.低渗透油藏毛管压力曲线特征分析及应用[J].西南石油学院学报:自然科学版,2002,24(2):21-24.
[15]俞启泰.关于剩余油研究的探讨[J].石油勘探与开发,1997,24(2):46-50.
[16]靳彦欣,林承焰,贺晓燕,等.油藏数值模拟在剩余油预测中的不确定性分析[J].石油大学学报:自然科学版,2004,28(3):22-29.