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时间:2020-04-30
《低渗透油藏储层分级评价方法及应用.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33卷第3期石油学报Vo1.33No.32012年5月ACTAPETROLEISINICAMay2012文章编号:0253-2697(2012)03—0437—05低渗透油藏储层分级评价方法及应用张仲宏杨正明。刘先贵熊伟王学武(1.中国地质大学能源学院北京100083;2.中国石油勘探开发研究院廊坊分院河北廊坊065007)摘要:低渗透石油探明储量逐年增加,低渗透油藏未动用储量占未动用总储量的比例较高。笔者在长庆、大庆外围、吉林和华北等油区2200块岩心分析的基础上,结合几个低渗透油区的开发现状,提出了用主流喉道半径、可动流体百分数、拟启动压力梯度、原油黏度和黏土矿物含量作为评价参数,确定了
2、各表征参数的分类界限,对比了几个低渗透油区储层表征参数数据的差异,深化了对低渗透储层的认识,提出了低渗透油区储层综合评价方法。研究表明,储层分类系数与区块单井产能有较好的相关关系。在此基础上,对长庆、大庆、吉林油田3大低渗透油区进行储层分类评价,确定了各油区不同分类级别所对应的渗透率范围。该项研究将对优选产能建设区块和确定投资具有指导意义,并为确定下步低渗透油藏攻关目标、技术对策及动用界限提供技术支撑。关键词:低渗透油藏;微观孔隙结构;储层分级评价;评价参数;岩心分析中图分类号:TE311文献标识码:AAgradingevaluationmethodforlow。permeabilityres
3、ervoirsanditsapplicationZHANGZhonghongYANGZhengmingLIUXianguiXIONGWeiWANGXuewu(1.SchoolofEnergyResources,ChinaUniversityofOeosciences,Beijing100083,China;2.LangfangBranch,PetroChinaResearchInstituteofPetroleumExploration&Development,Langng065007,China)Abstract:Thedemonstratedreservesoflow—permeabili
4、tyreservoirsinChinaincreaseyearbyyear.Thenon-producingreservesoflow—permeabilityreservoirsamounttOarelativelyhighpercentageoftheallnon—producingreservesinChina.Basedonthegeochemi—calanalysisof2200coresamplescollectedfromtheperipheralzoneoftheDaqingoilregion,theChangqing,JilinandHuabeioilre—gionsandi
5、ntegratedwiththecurrentsituationofsevera1majorlow-permeabilityreservoirsdevelopedbyPetroChinaCompanyLimit—ed,weproposedanumberofparameterstoevaluatelow—permeabilityreservoirs,suchastheradiusofmainflowthroat.percentageofmovablefluid,thresholdpressuregradient,viscosityofoilandcontentofclayminerals.Mea
6、nwhile,theclassificationlimitofva—riouscharacterizationparametersweredeterminedanddifferencesintheseparametersforthemainlow-permeabilityreservoirswerecompared,whichhasdeepenedourunderstandingaboutlow—permeabilityreservoirs.Thus,acomprehensiveevaluationmethodforlow—permeabilityreservoirswasproposed.T
7、heresultshowsthatthecorrelativitybetweenreservoirclassificationcoefficientsandthedeliverabilityofasingleoilwellisguitegood.Basedonthesedata,wecarriedoutareservoirclassificationevaluationonlow—permeabi
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