文章摘要
马尚伟.鄂尔多斯盆地南部盒8段致密砂岩储层微观孔隙结构表征与评价[J].地质与勘探,2022,58(6):1321-1330
鄂尔多斯盆地南部盒8段致密砂岩储层微观孔隙结构表征与评价
Characterization and evaluation of microscopic pore structures of tight sandstone reservoir in the 8th member of Shihezi Formation in southern Ordos Basin
投稿时间:2021-04-07  修订日期:2021-11-26
DOI:
中文关键词: 微观孔隙结构 致密砂岩储层 盒8段 鄂尔多斯盆地
英文关键词: micro-pore structure, tight sandstone reservoir, 8th member of Shihezi Formation, Ordos Basin
基金项目:国家重大科技专项“西北中生界陆相页岩气赋存方式与富集规律研究”(编号:2016ZX05034001-006)和中国地质调查局项目(编号:DD20221665)联合资助
作者单位E-mail
马尚伟 中国地质调查局西安地质调查中心陕西西安 陕西省地质调查规划研究中心(陕西省地质勘查基金中心)陕西西安 中国石油集团东方地球物理公司研究院长庆分院陕西西安 中国石油长庆油田分公司勘探开发研究院陕西西安 mashangwei123@163.com 
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中文摘要:
      鄂尔多斯盆地南部上古生界致密砂岩气藏储层的研究程度较低,而微观孔隙结构一直是致密砂岩油气藏储层研究的热点和重点。运用岩心观察、铸体薄片、恒速压汞、常规压汞曲线、气水相对渗透率曲线和核磁共振等多种实验方法,对鄂尔多斯盆地南部盒8段储层储集空间类型及微观孔隙结构进行了详细研究及分类表征与评价。结果表明,鄂尔多斯盆地南部盒8段储层的孔隙类型以岩屑溶孔、晶间孔和粒间孔为主。主流喉道半径与渗透率相关性较好,渗透率可作为致密砂岩储层的分类依据。依据渗透率和压汞参数,将盒8段储层分为4类。Ⅰ类~Ⅳ类储层孔隙度和渗透率不断变差,中值半径不断减小;气、水等渗点相对渗透率不断增大;自由流体驰豫时间和饱和度不断减小。选取孔隙度、渗透率、中值半径、可动流体饱和度、等渗点相对渗透率、测井解释结论六项参数,建立了鄂尔多斯盆地南部盒8段储层微观孔隙结构分类评价标准。其中Ⅰ类和Ⅱ类储层为有效储层,Ⅲ类和Ⅳ类储层为无效储层。
英文摘要:
      The Upper Paleozoic tight sandstone gas reservoirs in southern Ordos Basin have been little documented, and the microscopic structures of pores have always been a research focus. This work is based on core observations, casting thin sections, constant-rate mercury injection, conventional mercury injection curves, relative gas-water permeability, nuclear magnetic resonance tests to discuss the reservoir space types and microscopic pore structure of the 8th number of Shihezi Formation in southern Ordos Basin. Results show that the reservoir is dominated by debris dissolved pores, intergranular pores and intercrystalline?pores. Mainstream throat radius displays a good correlation with permeability, which can be used as the classification basis of tight sandstone reservoir. The reservoir can be divided into four types according to the permeability and the mercury injection parameters. In the order of type I-IV reservoirs, the porosity and permeability become worse, and the median radius continuously decreases; the relative permeability at the same permeability point gradually increases, and the free fluid relaxation time and saturation continuously decrease. Six parameters including porosity, permeability, median radius, movable fluid saturation, relative permeability at the same permeability point and logging interpretation were selected to establish the classification and evaluation criteria for the microscopic pore structures of the reservoir. Among them, the class Ⅰ and class Ⅱ reservoirs are effective reservoirs, while class Ⅲ and class Ⅳ reservoirs are invalid reservoirs.
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