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    致密油藏储层微观孔隙特征与可动用性评价

    熊生春 储莎莎 皮淑慧 何英 李树铁 张亚蒲

    熊生春, 储莎莎, 皮淑慧, 何英, 李树铁, 张亚蒲, 2017. 致密油藏储层微观孔隙特征与可动用性评价. 地球科学, 42(8): 1379-1385. doi: 10.3799/dqkx.2017.550
    引用本文: 熊生春, 储莎莎, 皮淑慧, 何英, 李树铁, 张亚蒲, 2017. 致密油藏储层微观孔隙特征与可动用性评价. 地球科学, 42(8): 1379-1385. doi: 10.3799/dqkx.2017.550
    Xiong Shengchun, Chu Shasha, Pi Shuhui, He Ying, Li Shutie, Zhang Yapu, 2017. Micro-Pore Characteristics and Recoverability of Tight Oil Reservoirs. Earth Science, 42(8): 1379-1385. doi: 10.3799/dqkx.2017.550
    Citation: Xiong Shengchun, Chu Shasha, Pi Shuhui, He Ying, Li Shutie, Zhang Yapu, 2017. Micro-Pore Characteristics and Recoverability of Tight Oil Reservoirs. Earth Science, 42(8): 1379-1385. doi: 10.3799/dqkx.2017.550

    致密油藏储层微观孔隙特征与可动用性评价

    doi: 10.3799/dqkx.2017.550
    基金项目: 

    中国石油重大科技攻关项目 2016E-1303

    国家油气重大专项 2017ZX05013-001

    详细信息
      作者简介:

      熊生春(1981-), 男, 高级工程师, 主要从事低渗致密油藏渗流理论与应用方面的研究

    • 中图分类号: P554

    Micro-Pore Characteristics and Recoverability of Tight Oil Reservoirs

    • 摘要: 致密油储层主要包括致密灰岩和致密砂岩,两者微观特征差异明显.但目前针对致密灰岩和致密砂岩的对比研究相对较少,因此开展致密油藏不同岩性微观孔隙结构特征及可动用性研究具有十分重要的意义.利用低温氮吸附比表面、核磁共振、压汞等方法,从纳米级、亚微米级、微米级孔隙等不同尺度表征了致密灰岩和致密砂岩孔隙结构差异,分析了不同孔隙对渗透率的贡献和对流体赋存的影响,研究了启动压力梯度的差异和喉道对启动压力梯度的影响.以川中灰岩和长庆砂岩为例,结果表明渗透率大于0.01 mD储层具备开发潜力,致密灰岩中的亚微米和微米级孔隙是重要的储集和流动空间,致密砂岩中微米级孔隙是重要的储集和流动空间.基于微观实验分析和低渗透油藏评价方法,提出了致密油藏分级评价参数,并给出了分级评价界限,对确定致密油藏攻关目标和优选区块新建产能意义重大.

       

    • 图  1  致密灰岩和致密砂岩岩心孔渗关系

      图  2  致密岩心渗透率与可动流体百分数关系

      Fig.  2.  Relationship between permeability and movable fluid percentage of tight cores

      图  3  致密岩心孔隙度与可动流体百分数关系

      Fig.  3.  Relationship between porosity and movable fluid percentage of tight cores

      图  4  致密灰岩不同喉道的可动流体份额

      Fig.  4.  Movable fluid share of different throats in tight limestone

      图  5  致密砂岩不同喉道的可动流体份额

      Fig.  5.  Movable fluid share of different throats in tight sandstone

      图  6  致密灰岩和致密砂岩启动压力梯度对比

      Fig.  6.  Comparison of starting pressure gradient between tight limestone and tight sandstone

      图  7  致密灰岩和致密砂岩不同级别渗透率岩心喉道分布

      Fig.  7.  Different levels of permeability core throat distribution of tight limestone and tight sandstone

      表  1  33块岩心微观孔隙结构测试结果

      Table  1.   Micro pore structure measurement results of 33 cores

      岩性 渗透率(mD) 纳米级r≤0.1 μm 亚微米0.1<r≤1.0 μm 微米级r>1.0 μm
      控制体积比例
      (%)
      渗透率贡献比例
      (%)
      控制体积比例
      (%)
      渗透率贡献比例
      (%)
      控制体积比例
      (%)
      渗透率贡献比例
      (%)
      致密灰岩 小于0.01 80.62 21.85 19.31 76.56 0.07 1.59
      0.01~0.1 66.76 8.35 31.89 68.16 1.35 23.49
      0.1~1 71.75 0.31 22.09 22.96 6.17 76.74
      致密砂岩 小于0.01 84.85 33.03 15.15 66.97 0.00 0.00
      0.01~0.1 62.37 24.50 37.57 73.68 0.05 1.82
      0.1~1 27.13 1.06 72.73 97.41 0.14 1.53
      下载: 导出CSV

      表  2  致密油储层特征参数及分类界限

      Table  2.   Characteristic parameters and classification boundaries of tight oil reservoirs

      类别 渗透率
      (mD)
      r>0.1 μm
      大孔隙比例(%)
      r>0.1 μm
      渗透率贡献(%)
      可动流体百分数
      (%)
      启动压力梯度
      (MPa/m)
      原油粘度
      (mPa·s)
      岩石脆性指数 压力系数
      一类 0.1~1 >40 >90 >40 <0.5 <2 >60 >1.1
      二类 0.01~0.1 20~40 80~90 20~40 0.5~1 2~5 20~40 0.9~1.1
      三类 <0.01 <20 <80 <20 >1 >5 <40 <0.9
      备注 储层宏观流动能力 大孔隙储集能力 大孔隙流动能力 大孔隙供给能力 储层流动阻力 流体流动能力 缝网重要条件 能量是否充足
      下载: 导出CSV
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