致密砂岩有效厚度下限标准的确定——以鄂尔多斯盆地周长地区长7段为例  

Lower limit standard determination of effective thickness in tight sandstone:a case study of Zhouchang area in the Ordos Basin

作　　者：李立博 LI Libo(School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710065,Shaanxi,China;Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi’an Shiyou University,Xi’an 710065,Shaanxi,China)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]西安石油大学陕西省油气成藏地质学重点实验室,陕西西安710065

出　　处：《石油地质与工程》2024年第6期37-41,共5页Petroleum Geology and Engineering

摘　　要：储层有效厚度下限标准对油气地质储量的计算至关重要,为了确定致密砂岩有效厚度下限的标准,选取鄂尔多斯盆地吴起油田周长地区长7段砂岩作为研究对象,基于岩心、测井、录井和试油资料,综合确定长7段致密砂岩储层的有效厚度下限标准。结果显示,长7段为特低孔特低渗致密砂岩储层;有效厚度下限标准为:岩性下限为细砂岩,含油级别下限为油迹级,物性下限值孔隙度Φ≥6.2%、渗透率K≥0.15×10^(-3)μm^(2),电性下限声波时差AC≥215.0μs/m、深感应电阻率RILD≥26.0Ω·m。参数值可为区域地质储量和储层评价提供依据,长7段砂岩储层条件有利,可作为致密砂岩油重点接替层位。The lower limit standard of effective reservoir thickness is crucial for reserve calculation.In order to make sure its standard in tight sandstone,Chang 7 member of Zhouchang area in Wuqi Oilfield,Ordos Basin was selected as the research object.Based on core,well logging,mud logging,and oil testing data,the standard is determined.The results show that Chang 7 member is a tight sandstone with extremely low porosity and permeability.The lower limit standards of effective thickness are as follows:fine sandstone,oil trace,porosityΦ≥6.2%,permeability K≥0.15×10^(-3)μm^(2),and the acoustic time difference AC≥215.0μs/m,and the deep induction resistivity RILD≥26.0Ω·m.The parameter values provide a basis for regional geological reserves and reservoir evaluation.The reservoir conditions in Chang 7 member are favorable and can be used as a key replacement layer in tight sandstone.

关 键 词：鄂尔多斯盆地 周长地区 长7段 致密砂岩 有效厚度 

分 类 号：TE112.2[石油与天然气工程—油气勘探]