鄂尔多斯盆地南部长6段储层流体识别研究  

Reservoir Fluid Identification in Chang 6 Member in Southern Ordos Basin

作　　者：李倩 杨静 王茜 Li Qian;Yang Jing;Wang Qian(Nanniwan Oil Production Plant,Yanchang Oilfield Co.,Ltd.,Yan'an Shaanxi 716000;Xiasiwan Oil Production Plant,Yanchang Oilfield Co.,Ltd.,Yan'an Shaanxi 716000)

机构地区：[1]延长油田股份有限公司南泥湾采油厂,陕西延安716000 [2]延长油田股份有限公司下寺湾采油厂,陕西延安716000

出　　处：《中外能源》2025年第1期65-70,共6页Sino-Global Energy

摘　　要：鄂尔多斯盆地南部长6油层组为典型的低孔低渗储层,储层流体性质识别难度大,制约了油藏的高效开发。首先通过储层岩石学分析,明确储层岩石类型。通过岩心观察、岩心物性分析,确定储层物性特征,将实验分析结果与测井资料相结合,对岩心及分析资料进行归位处理,获取储层孔隙度与声波时差参数,建立声波时差测井孔隙度解释模型。分析渗透率与孔隙度、渗透率与微电位/微梯度比值的关系,建立渗透率解释模型。基于岩心观察、试油试产结果,分析孔隙度、渗透率与储层含油性关系,确定有效储层物性下限。建立声波时差-电阻率交会图版,结合Fisher判别法开展流体识别。结果表明:长6油层组有效储层岩性、含油性下限为细砂岩、油斑级别;孔隙度、渗透率下限分别为7.4%、0.1×10^(-3)μm^(2);油水同层、差油层、油层的电阻率>20Ω·m且声波时差>230μs/m;利用声波时差-电阻率交会图版识别长6段储层流体,综合精度为78.7%,分层识别时长61、长62、长63段识别精度分别为85.3%、88.5%、91.7%;利用Fisher判别法进行识别,储层流体的综合正判率为86.3%。The Chang 6 member in the southern Ordos Basin is a typical low porosity and low permeability reservoir.It is difficult to identify the properties of reservoir fluid,which restricts the efficient development of the oil reservoir.First,the type of reservoir rocks is clarified through reservoir petrology analysis.The reservoir′s physical property characteristics are determined through core observation and core physical property analysis.The experimental analysis results are combined with logging data,and the core and analysis data are sorted out.The reservoir porosity and interval transit time parameters may be obtained,and the porosity interpretation model of logging by interval transit time is established.The relationship between permeability and porosity,permeability and micropotential/microgradient ratio is analyzed,and a permeability interpretation model is established.Based on the core observation,oil test,and trial production results,the relationship between porosity,permeability,and reservoir oil-bearing probability is analyzed to determine the lower limit of effective reservoir physical properties.The cross plot of interval transit time and resistivity is established,and the fluid may be identified combined with Fisher discriminant method.The results show that the lower limits of lithology and oil-bearing probability for the effective reservoirs in Chang 6 member are fine sandstone and oil spot grade;the lower limits of porosity and permeability are 7.4%and 0.1×10^(-3)μm^(2),respectively;the resistivity of oil-water layer,poor reservoir,and oil reservoir is greater than 20Ω·m,and the interval transit time is greater than 230μs/m;the cross plot of interval transit time and resistivity is applied to identification of Chang 6 reservoir fluid,with the comprehensive accuracy of 78.7%,and the accuracy of stratified identification of 85.3%,88.5%and 91.7%for Chang 61,Chang 62 and Chang 63,respectively.Using Fisher discriminant method,the comprehensive correct rate of reservoir fluid is 86.3%.

关 键 词：流体识别 孔隙度 渗透率 声波时差 含油性 电阻率 

分 类 号：TE34[石油与天然气工程—油气田开发工程] P618.13[天文地球—矿床学]