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页岩柱塞样与碎样孔隙度差异性分析与启示

付永红 蒋裕强 陈虎 周克明 邱峋晰 张海杰 刘雄伟 谷一凡 蒋增政

付永红, 蒋裕强, 陈虎, 周克明, 邱峋晰, 张海杰, 刘雄伟, 谷一凡, 蒋增政. 页岩柱塞样与碎样孔隙度差异性分析与启示[J]. 石油实验地质, 2020, 42(2): 302-310. doi: 10.11781/sysydz202002302
引用本文: 付永红, 蒋裕强, 陈虎, 周克明, 邱峋晰, 张海杰, 刘雄伟, 谷一凡, 蒋增政. 页岩柱塞样与碎样孔隙度差异性分析与启示[J]. 石油实验地质, 2020, 42(2): 302-310. doi: 10.11781/sysydz202002302
FU Yonghong, JIANG Yuqiang, CHEN Hu, ZHOU Keming, QIU Xunxi, ZHANG Haijie, LIU Xiongwei, GU Yifan, JIANG Zengzheng. Analysis and enlightenment of porosity differences between shale plug samples and crushed samples[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2020, 42(2): 302-310. doi: 10.11781/sysydz202002302
Citation: FU Yonghong, JIANG Yuqiang, CHEN Hu, ZHOU Keming, QIU Xunxi, ZHANG Haijie, LIU Xiongwei, GU Yifan, JIANG Zengzheng. Analysis and enlightenment of porosity differences between shale plug samples and crushed samples[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2020, 42(2): 302-310. doi: 10.11781/sysydz202002302

页岩柱塞样与碎样孔隙度差异性分析与启示

doi: 10.11781/sysydz202002302
基金项目: 

国家自然科学基金项目“页岩储层纳米孔隙结构表征及渗流机理研究” 51674044

四川省应用基础研究项目“海相页岩气建产核心区智能评价系统研究(省重)” 2019YJ0340

四川省苗子工程重点项目“基于压裂液返排规律评价页岩气储层压裂效果的方法研究” 2019JDRC0095

高等学校学科创新引智计划(111计划)“深层海相页岩气高校开发学科创新引智基地” D18016

详细信息
    作者简介:

    付永红(1990-), 男, 博士研究生, 主要从事油气地质、储层地质及油气藏开发地质研究。E-mail: fyh_swpu@163.com

  • 中图分类号: TE135

Analysis and enlightenment of porosity differences between shale plug samples and crushed samples

  • 摘要: 页岩孔隙度是评价页岩储层品质和页岩气储量计算的重要参数之一,因此准确测量页岩孔隙度十分重要。测量页岩孔隙度的方法较多,从样品形状上可分为柱塞样和碎屑颗粒样,从测量方法上可分为液体饱和法和氦气饱和法。目前对柱塞样孔隙度和碎样孔隙度测量结果比对研究较少,两者差异更是鲜见报道。首先通过测量典型柱塞样孔隙度,确定不同测量方法的适用范围;然后将柱塞样粉碎后测量其碎样孔隙度及分析影响碎样孔隙度的因素;最后比较柱塞样孔隙度和碎样孔隙度之间的差异。实验结果表明,页岩柱塞样氦孔隙度为页岩连通孔隙度,碎样氦孔隙度为页岩总孔隙度,且后者较前者高0.65%~2.40%,约占总孔隙度的11.21%~44.36%。柱塞样氦孔隙度偏小的原因主要有:(1)测量氦孔隙度的注入压力过低;(2)测量氦孔隙度前未对样品抽真空;(3)柱塞样中大量的不连通孔隙无法被氦气有效饱和。不同矿物组分与柱塞样、碎样孔隙度之间的相关性分析表明,不连通孔隙主要存在于有机质中,少量存在于黏土矿物中。为实现页岩气高效开发,可在压裂液中添加适当的化学剂,改造有机质和黏土矿物结构,释放不连通孔隙中的页岩气,以提高页岩气单井产量和页岩气采收率。

     

  • 图  1  碎样外观总体积测量原理

    Figure  1.  Measuring principle of appearance total volume of crushed sample

    图  2  样品R203-1有机孔(a)、无机孔(b)及微裂缝(c)电镜观测结果

    Figure  2.  Electron microscopic observations of organic pores(a), inorganic pores(b) and micro fractures(c) in sample R203-1

    图  3  岩心R203-1(a)和R203-4(b)在不同干燥温度下的核磁T2

    Figure  3.  NMR T2 spectra of cores R203-1(a) and R203-4(b) at different drying temperatures

    图  4  氦孔隙度与注入压力的关系

    Figure  4.  Relationship between helium porosity and injection pressure

    图  5  样品R203-1不同注入压力与平衡时间关系

    Figure  5.  Relationship between different injection pressures and balance time of sample R203-1

    图  6  粉碎粒径与氦孔隙度测量结果关系

    Figure  6.  Relationship between crushed particle size and helium porosity

    图  7  测量标块外观总体积与振实压力和振实次数的关系

    Figure  7.  Relationship between standard block volume and compaction pressure and times

    图  8  标块的测量体积与真实体积的关系

    Figure  8.  Relationship between measured and real volumes of standard blocks

    图  9  柱塞样与碎样(2.00~0.25 mm)氦孔隙度对比

    Figure  9.  Comparison of helium porosity between plug samples and crushed samples (2.00-0.25 mm)

    图  10  柱塞样和碎样氦孔隙度与有机碳含量和黏土矿物含量的关系

    Figure  10.  Relationship between helium porosity and TOC content and clay mineral content both in plug samples and crushed samples

    表  1  实验样品有机碳含量和岩石矿物学特征

    Table  1.   TOC content and petrological mineralogical characteristics of shale samples

    编号 深度/m 有机碳
    含量/%
    矿物含量/%
    黏土 石英 长石 方解石 白云石 黄铁矿
    R203-1 4 323.29 2.82 30.7 50.2 6.0 6.2 3.8 3.1
    R203-2 4 324.27 2.72 29.8 49.9 7.0 5.2 4.9 3.2
    R203-3 4 343.99 1.63 26.0 61.2 4.2 4.4 3.1 1.1
    R203-4 4 333.14 2.57 24.2 57.6 6.1 5.4 4.3 2.4
    R203-5 4 343.24 3.70 29.7 54.7 3.3 2.9 5.2 4.2
    R203-6 4 338.31 3.30 28.6 60.2 5.0 1.5 1.4 3.3
    下载: 导出CSV

    表  2  不同方法柱塞样孔隙度测量结果

    Table  2.   Plug sample porosity by various methods %

    样品号 液体饱和法孔隙度 核磁孔隙度 氦孔隙度
    饱和油 饱和盐水 饱和油 饱和盐水 0.8 MPa 3.0 MPa
    R203-1 4.49 5.71 4.55 6.99 3.71 4.25
    R203-2 4.85 5.50 4.98 4.12 3.50 4.09
    R203-3 3.06 4.11 3.16 4.98 3.20 3.80
    R203-4 3.97 4.68 4.04 5.14 2.68 3.02
    R203-5 5.02 6.05 5.49 6.78 4.05 4.98
    R203-6 4.73 6.36 4.91 6.98 4.36 5.26
    下载: 导出CSV
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  • 收稿日期:  2019-10-24
  • 修回日期:  2019-12-29
  • 刊出日期:  2020-03-28

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