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滇东威信地区龙潭组致密砂岩矿物组成特征及其油气地质意义

邢慧通 张晓丽 何金先 曹文杰 杨甜甜 王健 师帅

邢慧通,张晓丽,何金先,等. 滇东威信地区龙潭组致密砂岩矿物组成特征及其油气地质意义[J]. 煤田地质与勘探,2022,50(4):52−60 doi: 10.12363/issn.1001-1986.21.07.0403
引用本文: 邢慧通,张晓丽,何金先,等. 滇东威信地区龙潭组致密砂岩矿物组成特征及其油气地质意义[J]. 煤田地质与勘探,2022,50(4):52−60 doi: 10.12363/issn.1001-1986.21.07.0403
XING Huitong,ZHANG Xiaoli,HE Jinxian,et al. Mineral composition characteristics and petroleum geological significance of tight sandstone of Longtan Formation in Weixin area, eastern Yunnan[J]. Coal Geology & Exploration,2022,50(4):52−60 doi: 10.12363/issn.1001-1986.21.07.0403
Citation: XING Huitong,ZHANG Xiaoli,HE Jinxian,et al. Mineral composition characteristics and petroleum geological significance of tight sandstone of Longtan Formation in Weixin area, eastern Yunnan[J]. Coal Geology & Exploration,2022,50(4):52−60 doi: 10.12363/issn.1001-1986.21.07.0403

滇东威信地区龙潭组致密砂岩矿物组成特征及其油气地质意义

doi: 10.12363/issn.1001-1986.21.07.0403
基金项目: 国家自然科学基金项目(41702170);中国博士后科学基金项目(2015M571841)
详细信息
    第一作者:

    邢慧通,1996生,男,山西运城人,硕士研究生,从事沉积地质与油气地质方面的研究工作. E-mail:xhtyc@foxmail.com

    通信作者:

    张晓丽,1983生,女,内蒙古赤峰人,博士,讲师,硕士生导师,从事沉积地质与油气储层地质方面教学与研究工作. E-mail:xlzhang@cumt.edu.cn

  • 中图分类号: TE12

Mineral composition characteristics and petroleum geological significance of tight sandstone of Longtan Formation in Weixin area, eastern Yunnan

  • 摘要: 致密气是发育于低孔、特低渗透砂岩中的一种非常规资源,具有丰富的潜在油气储量,但由于其致密低渗透性,压裂改造是致密气高效开发的必须手段,而砂岩储集特征及物质组成对初步评价致密砂岩储层的资源潜力和生产能力有重要意义。运用X射线衍射、显微镜及扫描电镜等技术手段,对滇东威信地区二叠系龙潭组10个致密砂岩露头样品进行定性和定量分析。结果表明,龙潭组致密砂岩矿物组分以黏土矿物和石英为主,平均质量分数分别为42.5%和30.1%;其次为长石,平均含量14.7%;另外,还含有少量的方解石和锐钛矿,虽然在部分样品中有检出,但其平均含量分别达到9.05%和14.4%。通过矿物组分法获得龙潭组致密砂岩的岩石脆性指数为0.575,脆性效果较好,有利于压裂。黏土矿物组合特征反映出龙潭组砂岩为深层低渗透砂岩储集层,物质来源与岩浆热液及玄武岩的风化产物有关。研究区龙潭组致密砂岩储层为高黏土矿物储层,尤其是绿泥石、高岭石的普遍存在,对孔隙发育有消极作用,影响煤系气的运移与储存,总体上属于深层低渗透高黏土矿物砂岩储层。但龙潭组上段高含量的碳酸盐类矿物,充填在孔裂隙中,对砂岩具有较强的抗压实作用,也是后期溶蚀作用的物质基础,易形成次生孔隙,对致密砂岩气藏的形成和开发有一定的促进作用,因此,龙潭组上段可作为下一步致密砂岩储层改造和致密气开发的首选层段。

     

  • 图  1  滇东威信地区地理位置与构造位置

    Fig. 1  Brief map of the geographical location and regional geology of Weixin area in eastern Yunnan

    图  2  石坎向斜龙潭组矿物成分含量剖面

    Fig. 2  Mineral composition profile of Longtan Formation of Shikan syncline

    图  3  石坎向斜致密砂岩样品脆性矿物含量折线

    Fig. 3  Broken line diagram of brittle mineral content in tight sandstone samples of Shikan syncline

    图  4  石坎向斜龙潭组致密砂岩样Y-4微裂隙

    Fig. 4  Y-4 microfractures of tight sandstone sample of Longtan Formation of Shikan syncline

    图  5  长石溶蚀后被方解石充填

    Fig. 5  Feldspar filled with calcite after dissolution

    图  6  绿泥石存在位置和形式

    Fig. 6  Location and form of chlorite

    图  7  高岭石赋存形式

    Fig. 7  Occurrence form of kaolinite

    表  1  样品来源及分析方法

    Table  1  Sample source and analysis methods

    采样编号野外分层野外命名
    Y-1—Y-2龙潭组下段粉砂岩
    Y-3龙潭组上段泥质粉砂岩
    Y-4—Y-5细砂岩
    Y-6—Y-10粉砂岩
    下载: 导出CSV

    表  2  滇东威信地区龙潭组致密砂岩X-射线衍射分析报告

    Table  2  X-ray diffraction analysis report of tight sandstone of Longtan Formation in Weixin area of eastern Yunnan

    样品
    编号
    黏土矿物相对质量分数/%全岩定量分析/%
    高岭石
    K
    绿泥石
    C
    伊利石
    I
    蒙皂石
    S
    伊/蒙混
    层I/S
    伊/蒙混
    层比
    绿/蒙混
    层C/S
    绿/蒙混
    层比
    黏土石英钾长石斜长石方解石白云石锐钛矿
    Y-1 20 46 2 23 30 9 50 50.5 26.3 11.7 11.5
    Y-2 32 24 35 30 9 40 47.6 27.1 11.7 13.6
    Y-3 14 76 1 9 50 51.6 28.0 3.9 16.5
    Y-4 11 21 1 62 30 5 50 63.7 9.5 10.2 16.6
    Y-5 13 50 2 35 30 27.1 54.8 14.5 3.6
    Y-6 20 32 1 37 25 10 40 38.2 36.1 11.2 0.6 13.9
    Y-7 14 31 1 54 30 36.1 34.6 27.3 2.0
    Y-8 14 85 1 34.7 31.8 17.4 16.1
    Y-9 13 84 1 2 37.0 27.5 21.8 13.7
    Y-10 13 85 1 1 38.6 25.6 17.5 18.3
    下载: 导出CSV

    表  3  研究区与典型致密砂岩储层脆性指数对比

    Table  3  Comparison of brittleness index between the study area and typical tight sandstone reservoirs

    研究区储层脆性指数/%
    淮中4区块董2井北侏罗系致密砂岩[17]0.50~0.83
    鄂尔多斯盆地勘探X新区长8—长10致密砂岩[18]0.40~0.52
    红河92井区长812单层致密砂岩[19]0.37~0.64
    滇东威信石坎向斜龙潭组致密砂岩0.36~0.73
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-07-29
  • 修回日期:  2021-11-17
  • 刊出日期:  2022-04-25
  • 网络出版日期:  2022-04-21

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