摘要
延长组长2油层组是鄂尔多斯盆地南部区块开发的重点层系。长2油层组采出程度低(<10%),综合含水率高(>91%),平均单井产量低(<0.1t/d),储层岩性、物性、含油性、电性下限标准差异性较大,建立有效储层参数下限解释模型有利于推动长2油藏高效开发。文章以鄂尔多斯盆地南部区块为例,利用岩心分析资料和常规测井资料,建立长2油层组储层孔隙度、渗透率、饱和度解释模型,结合试油试产数据,建立孔隙度与每米产液量关系图版,确定有效储层孔隙度、渗透率下限;建立声波时差-电阻率、孔隙度-含油饱和度图版,确定有效储层电性下限。结果表明,有效储层孔隙度、渗透率、含油饱和度下限分别为9.0%、0.3×10^(-3)μm^(2)、35%;声波时差下限为225μs/m,电阻率下限为11Ω·m。
The Chang 2 member of the Yanchang Formation is a pivotal formation in the development of the southern Ordos Basin.The Chang 2 reservoir group exhibits a low recovery factor(<10%),a high overall water cut(>91%),and an average production rate per well that is relatively low(<0.1 t/d).There are signif icant discrepancies in the lower limit standards concerning reservoir lithology,physical properties,oil saturation,and electrical characteristics.Establishing an effective interpretation model for the lower limit parameters of reservoirs will facilitate the eff icient development of the Chang 2 reservoir.In this paper,the southern block of the Ordos Basin serves as a case study for establishing an interpretation model that characterizes reservoir porosity,permeability,and saturation within the Chang 2 oil formation.This was achieved through the integration of core analysis data and conventional logging data.A relationship chart correlating porosity with liquid production per meter was developed by synthesizing oil test results and production data,which facilitated the determination of lower limits for effective reservoir porosity and permeability.Additionally,the lower limit for effective reservoir electrical properties was established by constructing plots that relate sonic time-lag resistivity to porosity and oil saturation.The lower threshold of effective reservoir electrical properties is established through the correlation between sonic time-lag resistivity and porosity oil saturation.The results indicate that the minimum thresholds for effective reservoir porosity,permeability,and oil saturation are 9.0%,0.3×10^(-3)μm^(2)and 35%,respectively.Additionally,the lower limit of acoustic time difference is determined to be 225μs/m,while the minimum electrical resistivity is found to be 11Ω·m.
作者
李倩
杨静
王茜
LI Qian;YANG Jing;WANG Qian(Nanniwan Oil Production Plant,Yanchang Oilf ield Co.,Ltd.,Yan’an 716000,China;Xiasiwan Oil Production Plant,Yanchang Oilf ield Co.,Ltd.,Yan’an 716000,China)
出处
《化工管理》
2025年第2期152-156,共5页
Chemical Management
关键词
长2油层组
延长组
含油性
参数下限
Chang 2 member
Yanchang formation
oil bearing property
lower limit of parameter
