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南方下古生界海相页岩极低电阻率成因及其地质意义

侯宇光 张坤朋 何生 覃魏峰 肖艳 王成 余锐

侯宇光, 张坤朋, 何生, 覃魏峰, 肖艳, 王成, 余锐. 南方下古生界海相页岩极低电阻率成因及其地质意义[J]. 地质科技通报, 2021, 40(1): 80-89. doi: 10.19509/j.cnki.dzkq.2021.0104
引用本文: 侯宇光, 张坤朋, 何生, 覃魏峰, 肖艳, 王成, 余锐. 南方下古生界海相页岩极低电阻率成因及其地质意义[J]. 地质科技通报, 2021, 40(1): 80-89. doi: 10.19509/j.cnki.dzkq.2021.0104
Hou Yuguang, Zhang Kunpeng, He Sheng, Qin Weifeng, Xiao Yan, Wang Cheng, Yu Rui. Origin and geological significance of ultra-low resistivity in Lower Paleozoic marine shale, South China[J]. Bulletin of Geological Science and Technology, 2021, 40(1): 80-89. doi: 10.19509/j.cnki.dzkq.2021.0104
Citation: Hou Yuguang, Zhang Kunpeng, He Sheng, Qin Weifeng, Xiao Yan, Wang Cheng, Yu Rui. Origin and geological significance of ultra-low resistivity in Lower Paleozoic marine shale, South China[J]. Bulletin of Geological Science and Technology, 2021, 40(1): 80-89. doi: 10.19509/j.cnki.dzkq.2021.0104

南方下古生界海相页岩极低电阻率成因及其地质意义

doi: 10.19509/j.cnki.dzkq.2021.0104
基金项目: 

国家自然科学基金项目 41772143

国家科技重大专项子课题 2016ZX05034002-003

中国地质调查局项目 DD20190561-1

详细信息
    作者简介:

    侯宇光(1979-), 男, 副教授, 博士生导师, 主要从事油气成藏、页岩油气储层及其资源评价等方面的教学与科研工作。E-mail:sporthyg@126.com

    通讯作者:

    张坤朋(1992-), 男, 助理工程师, 主要从事非常规油气地质和工程地质研究工作。E-mail:1192014346@qq.com

  • 中图分类号: P588.2

Origin and geological significance of ultra-low resistivity in Lower Paleozoic marine shale, South China

  • 摘要: 基于测井电阻率和有机地球化学数据,利用页岩极化率测试和干酪根激光拉曼测试等技术手段,对导致南方下古生界高演化海相页岩呈现极低电阻率(测井电阻率低至10~1Ω·m及以下)的主控因素进行了分析,深入探究了其内在成因,并对其地质意义进行了探讨。结果显示:有机质丰度和成熟度是影响极低电阻率测井的主要因素;w(TOC)与测井电阻率和实测电阻率均呈现出良好的负相关关系;成熟度越高,达到极低电阻率所需要的最低w(TOC)界限值越低,页岩的极化率也随之增加。石墨化的有机质是致使高演化页岩出现极低电阻率的主要"导电矿物",有机质开始发生石墨化的"临界点"对应的Rmc Ro约为3.5%。极低电阻率特征是页岩有机质结构发生显著变化、向石墨化演进的重要标志。极低电阻率测井响应预示着页岩储层品质极可能遭受了巨大的损害:生烃能力枯竭、有机质孔隙大幅减少、吸附性能降低、含气性骤降。因此,圈定极低电阻率页岩范围,排除"有机质石墨化"的高风险区,对下古生界高演化海相页岩选区评价具有重要意义。

     

  • 图 1  中上扬子下古生界极低电阻率钻井分布图(Ro等值线据文献[8]修改)

    a.下寒武统页岩;b.上奥陶统五峰组-下志留统龙马溪组页岩

    Figure 1.  Distribution of Lower Paleozoic ultra-low resistivity wells in middle-upper Yangtze area

    图 2  典型极低电阻率钻井测井电阻率与w(TOC)关系图

    Figure 2.  Correlation between logging resistivity and TOC of typical ultra-low resistivity wells

    图 3  不同成熟度页岩富有机质层段(w(TOC)>2.0%)测井电阻率均值

    Figure 3.  Average logging resistivity of rich organic section (TOC>2.0%) of shale with different maturity

    图 4  极低电阻率钻井样品实测电阻率与w(TOC)关系

    Figure 4.  Correlation between measured resistivity and TOC of samples from ultra-low resistivity wells

    图 5  页岩极化率与w(TOC)关系

    Figure 5.  Correlation between polarizability and TOC of shale samples

    图 6  页岩干酪根典型激光拉曼光谱

    Figure 6.  Typical Raman spectra of shale kerogen samples

    图 7  干酪根激光拉曼光谱的峰高比和峰间距随成熟度变化(a.本文;b.据文献[25];c.据文献[11])

    Figure 7.  Variation trends of kerogen Raman spectra parameters of peak position difference and integrated intensity ratio with increasing thermal maturity

    图 8  极低电阻率页岩的成因模式图

    a.分散有机质阶段;b.有机质网络形成阶段;c.有机质石墨化-极低电阻率形成阶段;Q.石英; Py.黄铁矿;Ca.碳酸盐矿物;Clay.黏土矿物;Kom.干酪根;Bom.迁移有机质;e.示意电子;有机质中的短线示意碳层的有序性和延展性

    Figure 8.  Genetic model of ultra-low resistivity shale

    图 9  页岩电阻率、拉曼光谱参数、孔隙度、含气性随成熟度演化模式图

    Figure 9.  Evolution model diagram of shale resistivity, Raman spectrum parameters, porosity and gas bearing property with maturity

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  • 收稿日期:  2019-12-25

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