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苏里格地区致密砂岩矿物组成与微观结构及其对水力压裂的潜在影响

李培月 何晓东 周长静 解永刚 史华

李培月,何晓东,周长静,等. 苏里格地区致密砂岩矿物组成与微观结构及其对水力压裂的潜在影响[J]. 水文地质工程地质,2023,50(3): 1-11 doi:  10.16030/j.cnki.issn.1000-3665.202211048
引用本文: 李培月,何晓东,周长静,等. 苏里格地区致密砂岩矿物组成与微观结构及其对水力压裂的潜在影响[J]. 水文地质工程地质,2023,50(3): 1-11 doi:  10.16030/j.cnki.issn.1000-3665.202211048
LI Peiyue, HE Xiaodong, ZHOU Changjing, et al. Mineral compositions and microstructural characteristics of the tight sandstone reservoir in the Sulige area and their potential influence on hydraulic fracturing[J]. Hydrogeology & Engineering Geology, 2023, 50(3): 1-11 doi:  10.16030/j.cnki.issn.1000-3665.202211048
Citation: LI Peiyue, HE Xiaodong, ZHOU Changjing, et al. Mineral compositions and microstructural characteristics of the tight sandstone reservoir in the Sulige area and their potential influence on hydraulic fracturing[J]. Hydrogeology & Engineering Geology, 2023, 50(3): 1-11 doi:  10.16030/j.cnki.issn.1000-3665.202211048

苏里格地区致密砂岩矿物组成与微观结构及其对水力压裂的潜在影响

doi: 10.16030/j.cnki.issn.1000-3665.202211048
基金项目: 国家自然科学基金项目(42072286;41761144059);陕西省科技厅秦创原队伍建设项目(2022KXJ-005);中国石油科学研究与技术开发项目(2021DJ2015)
详细信息
    作者简介:

    李培月(1984-),男,博士,教授,博士生导师,主要从事环境水文地球化学方面的教学与科研工作。E-mail:lipy2@163.comlipy2@163.com

  • 中图分类号: P641.4;P618.13

Mineral compositions and microstructural characteristics of the tight sandstone reservoir in the Sulige area and their potential influence on hydraulic fracturing

  • 摘要: 致密砂岩气是重要的非常规天然气资源,致密砂岩储层的矿物组成特征与孔隙微观结构不仅会影响致密储层中天然气的赋存状态,同时也对水力压裂改造效果具有重要影响。然而,有关致密砂岩矿物成分及其微观赋存形态对气井水力压裂潜在影响的研究尚不充分,针对这一问题,文章以鄂尔多斯盆地苏里格地区主开采层——二叠系下石盒子组盒8段致密砂岩为研究对象,钻取5口气井岩心样品,利用XRF、XRD、铸体薄片、SEM及EDS能谱等技术系统分析了该段致密砂岩矿物组成、微观形貌、孔隙分布等储层特征。基于分析结果,探讨了上述储层特征因素对水力压裂的潜在影响。研究发现,苏里格地区盒8段致密砂岩主要为岩屑砂岩和岩屑石英砂岩,密度介于2.44~2.56 g/cm3之间,孔隙度为7.7%~12.6%,渗透率为0.16~1.42 mD,属于典型的低渗透气藏。矿物成分主要为石英和黏土矿物,而长石矿物和碳酸盐矿物含量极低。其中黏土矿物含量占比为16.5%~47.4%,以高岭石、伊利石和绿泥石为主。高岭石在该区致密砂岩中广泛发育,呈书页状和蠕虫状填充于粒间孔隙及粒表,形成大量高岭石晶间孔。此外,致密砂岩中粒间孔隙、粒内溶孔、粒间裂隙及粒内缝均有发育,为致密砂岩气的赋存提供了良好的储集空间。矿物分析以及压裂液致密砂岩水岩实验结果显示黏土矿物稳定性对于苏里格地区致密砂岩气水力压裂效果至关重要,尤其是易分散运移的高岭石和伊利石矿物。水力压裂前需要对储层矿物成分及地层水成分展开详细研究,选择合适的黏土稳定剂优化水力压裂。
  • 图  1  研究区位置及取样井分布

    Figure  1.  Location of the study area and samples

    图  2  致密砂岩显微照片

    Figure  2.  Micrographs of the tight sandstone

    图  3  致密砂岩铸体薄片显微照片

    Figure  3.  Micrographs of the cast thin section of the tight sandstone

    图  4  典型矿物显微照片与能谱分析

    Figure  4.  SEM and EDS analyses of the typical minerals

    图  5  致密砂岩微观孔隙特征

    Figure  5.  Microscopic pore characteristics of the tight sandstone

    图  6  压裂液处理后黏土矿物微观形貌

    Figure  6.  Microstructure of the clay minerals after fracturing fluid-tight sandstone interactions

    表  1  储层岩心主要元素含量

    Table  1.   Main elements of the reservoir core /(mg·kg−1

    样品编号ZrSrRbZnFeMnCrVTiCaK
    桃10183.671.9551.4344.4824028216.1< LOD50.812384326115949
    召42426.0112.3097.9342.3431273350.033.76114.67667231632037
    统98218.984.5058.4233.5219717397.2< LOD< LOD36071496421756
    召60131.882.1629.9239.58169301429.0< LOD36.851812507879202
    召62279.8128.40103.0071.2029066272.1< LOD104.74542552739314
    注:<LOD表示低于检出限。
    下载: 导出CSV

    表  2  储层岩心矿物组成

    Table  2.   Mineral compositions of the reservoir core /(wt%)

    样品编号石英斜长石钾长石方解石伊利石绿泥石+高岭石赤铁矿方沸石
    桃1074.60.44.219.81.0
    召4265.60.20.20.49.822.90.9
    统9881.61.05.610.90.9
    召6045.918.03.931.80.4
    召6251.50.427.320.10.7
    下载: 导出CSV
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  • 收稿日期:  2022-11-15
  • 修回日期:  2023-01-08
  • 网络出版日期:  2023-03-15
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