摘要
随着鄂尔多斯盆地勘探开发程度不断增强,研究区已进入中高含水期,为提高储层评价精度及完成储量复算,需重新确定有效厚度下限。本文通过对岩心、铸体薄片、压汞实验等资料进行分析,并结合测井、录井等资料,对鄂尔多斯盆地Y井区延8段储层的四性关系进行研究并确定有效储层下限。结果表明:Y井区延8段主要发育长石岩屑砂岩和岩屑长石砂岩,储集空间以粒间孔为主,整体表现为中孔、中渗储层。储层岩性对物性有显著影响,粒径与物性呈正相关性,物性越好,含油级别越高。在此基础上建立了储层岩性、物性及含油饱和度测井解释模型,并运用该模型结合实验分析、试油结论等资料,确定了Y井区延8段有效储层下限标准。其中岩性为中—细砂岩,孔隙度为13%,渗透率为12.9×10^(-3)μm^(2),声波时差为228μs/m,电阻率为17Ω·m,含油饱和度为50%,岩心含油级别为油迹级。
With the development of exploration and development in Ordos Basin,the study area has entered the middle-high water-cut stage.In order to improve the accuracy of reservoir evaluation and to complete the re-calculation of reserves,it is necessary to re-determine the lower limit of effective thickness.Through sorting and analyzing the data of core,casting thin section and mercury injection experiment,and combining with the data of well logging,the four-property relationship of Yan8 Member reservoirs in Well Block Y of Ordos Basin is studied and the lower limit of effective reservoirs is determined in this paper.The results show that the feldspar lithic sandstone and lithic feldspar sandstone mainly develop in Yan8 Member of Well Block Y.The reservoir space is dominated by intergranular pores,and the reservoirs with medium porosity and medium permeability develop in general.The lithology of the reservoirs has a significant effect on the physical properties,the particle size and physical properties are positive correlation,and better physical properties show higher oil-bearing grade.On this basis,the logging interpretation model of reservoir lithology,physical properties and oil saturation is established.The lower limit standard of effective reservoirs of Yan 8 Member in Well Block Y is made through the new interpretation model and data of experimental analysis and oil test conclusion.The lithology is medium-fine sandstone,the porosity is 13%,and the permeability is 12.9×10^(-3)μm2.Acoustic time difference is 228μs/m,and resistivity is 17Ω·m.0il saturation is 50%,and the oil-bearing grade of the cores is oil trace.
作者
王博
赵永刚
王印章
Wang Bo;Zhao Yonggang;Wang Yinzhang(School of Geosciences and Engineering,Xi'an University of Petroleum,Xi'an Shaanxi 710065;Shaanxi Provincial Key Laboratory of Petroleum Accumulation Geology,Xi'an Shaanxi 710065)
出处
《中外能源》
CAS
2023年第3期51-57,共7页
Sino-Global Energy
基金
国家科技重大专项“中生界低渗透储层非均质性评价技术”(编号:2016ZX05050006)
陕西省自然科学基础研究计划项目“基于高光谱图像的碳酸盐岩岩溶识别及其表征研究”(编号:2019JM-381)。
关键词
延8段
四性关系
测井解释模型
有效储层下限
Yan 8 Member
four-property relationship
log interpretation model
lower limit of effective reservoir
