小尺度等效表征技术在油藏数值模拟研究中的应用——以渤海C油田馆陶组辫状河储层为例
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摘要
目前我国东部大部分油田已进入高或特高含水阶段,随着油气开发程度的不断深入,砂体内部结构控制的剩余油挖潜逐渐成为油田开发的主要目标。自著名河流沉积学家Miall于1985年提出储层构型的概念及研究方法以来,很多学者开展了大量基于露头、现代沉积及密井网的储层构型研究工作。然而如何在油藏数值模拟模型中精确表征更小级次构型单元及界面(小尺度地质信息),从而提高剩余油的预测精度和油田采收率成为当前油藏精细化研究的重要方向。以渤海C油田馆陶组辫状河储层为例,采用基于小尺度地质体等效表征的方法,即通过设置单元间网格传导率达到在油藏数值模拟中精细表征薄夹层对渗流效果及剩余油分布的影响。结果表明,该研究方法有效提高了单井历史拟合精度及井间剩余油分布预测精度,取得较好的应用效果。
At present,the most of oilfields in Eastern China have entered into a high-extra high water-cut stage,with the continuous deepening of oil and gas development,the remaining oil potential controlled by the internal structure of sand bodies has gradually become the main goal of oilfield development.Since the famous river sedimentary scientist Miall put forward the concept and research method of reservoir configuration in 1985,many scholars have carried out a large number of reservoir configuration research based on outcrop,modern sedimentation and dense well pattern.However,how to accurately characterize the smaller hierarchical units and interfaces(small scale geological information)in the reservoir numerical simulation model,improving the prediction accuracy of remaining oil and oil recovery has become an important direction of reservoir refinement research.This paper takes braided river reservoir of Guantao Formation in Bohai Caofeidian 11-1 Oilfield as an example,the method of small scale geological body based on equivalent characterization was used,the unit grid conduction rate in reservoir numerical simulation was set to characterize the influence of thin interlayer on the seepage effect and residual oil distribution.The research results show that the method can be used for effectively improving the accuracy of single well history matching and the prediction accuracy of remaining oil distribution between wells,and it achieves better application results.
At present,the most of oilfields in Eastern China have entered into a high-extra high water-cut stage,with the continuous deepening of oil and gas development,the remaining oil potential controlled by the internal structure of sand bodies has gradually become the main goal of oilfield development.Since the famous river sedimentary scientist Miall put forward the concept and research method of reservoir configuration in 1985,many scholars have carried out a large number of reservoir configuration research based on outcrop,modern sedimentation and dense well pattern.However,how to accurately characterize the smaller hierarchical units and interfaces(small scale geological information)in the reservoir numerical simulation model,improving the prediction accuracy of remaining oil and oil recovery has become an important direction of reservoir refinement research.This paper takes braided river reservoir of Guantao Formation in Bohai Caofeidian 11-1 Oilfield as an example,the method of small scale geological body based on equivalent characterization was used,the unit grid conduction rate in reservoir numerical simulation was set to characterize the influence of thin interlayer on the seepage effect and residual oil distribution.The research results show that the method can be used for effectively improving the accuracy of single well history matching and the prediction accuracy of remaining oil distribution between wells,and it achieves better application results.
引文
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[8]孙天件,穆龙新,赵过良.砂质辫状河储集层隔夹层类型及其表征方法[J].石油勘探与开发,2014,41(1):112~120.
[2]Miall A D.Reservoir heterogeneities in fluvial sandstone:Lessons from outcrop studies[J].AAPG,1988,72(6):682~697.
[3]李志鹏,林承焰,彭学红,等.高浅南区明化镇组单砂体夹层对剩余油的控制作用[J].石油天然气学报(江汉石油学院学报),2011,23(9):23~27.
[4]杜庆军,陈月明,侯键,等.胜坨油田厚油层内部夹层分布对剩余油的控制作用[J].石油天然气学报(江汉石油学院学报),2006,28(4):111~114.
[5]崔建,陈能学,李本维,等.辫状河储层单砂体精细地质建模与剩余油分布研究——中国石油二次开发技术与实践(2008-2010年)[C].北京:石油工业出版社,2012:166~175.
[6]刘文岭.地震约束储层地质建模技术[J].石油学报,2008,29(1):64~68,74.
[7]李苗.基于地震约束的辫状河储层地质建模研究[D].西安:西安石油大学,2015.
[8]孙天件,穆龙新,赵过良.砂质辫状河储集层隔夹层类型及其表征方法[J].石油勘探与开发,2014,41(1):112~120.