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    鄂西地区下寒武统牛蹄塘组页岩气成藏及保存条件分析:以XD1井为例

    董敏 张林炎 王宗秀 董会 朱永刚

    董敏, 张林炎, 王宗秀, 董会, 朱永刚, 2019. 鄂西地区下寒武统牛蹄塘组页岩气成藏及保存条件分析:以XD1井为例. 地球科学, 44(11): 3616-3627. doi: 10.3799/dqkx.2019.127
    引用本文: 董敏, 张林炎, 王宗秀, 董会, 朱永刚, 2019. 鄂西地区下寒武统牛蹄塘组页岩气成藏及保存条件分析:以XD1井为例. 地球科学, 44(11): 3616-3627. doi: 10.3799/dqkx.2019.127
    Dong Min, Zhang Linyan, Wang Zongxiu, Dong Hui, Zhu Yonggang, 2019. Accumulation Characteristics and Preservation Conditions of Niutitang Formation of Lower Cambrian Series Shale Gas in West Hubei: A Case Study of Well XD1. Earth Science, 44(11): 3616-3627. doi: 10.3799/dqkx.2019.127
    Citation: Dong Min, Zhang Linyan, Wang Zongxiu, Dong Hui, Zhu Yonggang, 2019. Accumulation Characteristics and Preservation Conditions of Niutitang Formation of Lower Cambrian Series Shale Gas in West Hubei: A Case Study of Well XD1. Earth Science, 44(11): 3616-3627. doi: 10.3799/dqkx.2019.127

    鄂西地区下寒武统牛蹄塘组页岩气成藏及保存条件分析:以XD1井为例

    doi: 10.3799/dqkx.2019.127
    基金项目: 

    中国地质调查局油气地质调查项目 DD20160183

    中国地质调查局油气地质调查项目 DD20190085

    详细信息
      作者简介:

      董敏(1983-), 女, 博士, 主要从事构造地质和油气地质研究

      通讯作者:

      董敏

    • 中图分类号: P539

    Accumulation Characteristics and Preservation Conditions of Niutitang Formation of Lower Cambrian Series Shale Gas in West Hubei: A Case Study of Well XD1

    • 摘要: 为了获得鄂西地区下寒武统牛蹄塘组页岩气成藏特征,通过对XD1井储层裂缝统计,方解石脉流体包裹体测试以及寒武纪碎屑锆石U-Pb同位素年代学研究.XD1井裂缝发育,以高角度剪切缝为主,裂缝大部分被方解石充填.液相包裹体成分以H2O和CH4为主,气相包裹体成分含有CO2、H2S、CH4、N2和H2.流体包裹体的均一温度显示出较大差异性,从168~293℃均有分布,且大致划分为3个区间:168~175℃低温区、185~227℃中温区和244~293℃高温区,反映出页岩气成藏具有多期次成藏的特点,大部分晚期次生包裹体处于中温区,且CH4含量较高,因此页岩气主要成藏期为晚期次生聚集成藏.获得有效碎屑锆石年龄数据178组,年龄值变化范围在2 638~330 Ma区间内,主要集中在2 638~2 010 Ma、1 997~1 516 Ma、1 450~904 Ma、890~722 Ma和699~330 Ma的5个时间段,说明XD1井经历多期构造改造.XD1井页岩气具有生烃的物质基础,但由于多期的构造运动产生大量裂缝和破裂带,导致页岩气保存条件的破坏,造成了页岩气的散失,因此,鄂西地区优选页岩气有利勘探区重点是寻找构造稳定区.

       

    • 图  1  研究区大地构造位置

      Fig.  1.  Tectonic location of the study area

      图  2  XD1井地层柱状图

      Fig.  2.  Stratigraphy of Well XD1

      图  3  XD1井裂缝特征统计图

      Fig.  3.  The statistical histogram of characteristics of fractures in Well XD1

      图  4  流体包裹体激光拉曼光谱图

      Fig.  4.  The laser Raman spectra of fluid inclusions

      图  5  流体包裹体均一温度统计直方图

      Fig.  5.  Histogram showing homogenization temperatures of fluid inclusions

      图  6  鄂西地区采集样品的锆石U-Pb年龄谐和图和直方图

      Fig.  6.  Concordia plots and histograms of the detrital zircon U-Pb dating of selected samples in West Hubei

      表  1  XD1井裂缝特征

      Table  1.   The statistics of fracture characteristics

      切深 条数 百分比 裂缝类型 条数 百分比 充填性 条数 百分比
      0~5 cm 105 25.74% 缝合线 21 2.43% 方解石充填 583 71.18%
      5~10 cm 164 40.20% 剪切缝 502 58.10% 未充填裂缝 236 28.82%
      10~15 cm 74 18.14% 网状缝 15 1.74% / / /
      15~20 cm 35 8.58% 张扭缝 126 14.58% / / /
      >20 cm 30 7.35% 滑脱缝 200 23.15% / / /
      合计 408 100% 合计 864 100% 合计 819 100%
      下载: 导出CSV

      表  2  鄂西地区XD1井裂缝方解石脉流体包裹体液相、气相激光拉曼分析和均一温度测试数据

      Table  2.   Liquid-phase and gas-phase laser Raman analysis of the fluid inclusions of calcite vein in fractures and homogenization temperatures in West Hubei

      样号 深度(m) 宿主矿物 类型 成因 液相(摩尔数的相对百分含量%) 气相(摩尔数的相对百分含量%) 冰点(℃) 均一温度(℃)
      CH4 H2O CO2 H2S CH4 N2 H2
      XD01 1 085.2 裂缝方解石脉 气液两相 晚期次生 100 11.3 66.4 22.4 -16.2 224.7~228.3(227)
      XD02 1 085.2 裂缝方解石脉 气液两相 晚期次生 0.06 99.94 4.1 8.3 71.2 16.4 -19.4 185.4~203.5(194)
      XD03 1 085.2 裂缝方解石脉 气液两相 晚期次生 0.02 99.98 10.0 86.0 4.0 -17.6 240.8~250.4(244)
      XD04 1 085.2 裂缝方解石脉 气液两相 晚期次生 100 14.0 86.0 -18.1 187.4~198.8(193)
      XD05 1 299.5 裂缝方解石脉 气液两相 晚期次生 100 8.6 91.4 -15.8 182.3~195.8(190)
      XD06 1 299.5 裂缝方解石脉 气液两相 早期次生 100 38.2 32.9 28.8 -12.9 289.7~299.8(293)
      XD07 1 326.7 裂缝方解石脉 气液两相 晚期次生 100 10.8 79.7 9.5 -17.9 167.7~168.3(168)
      XD08 1 326.7 裂缝方解石脉 气液两相 晚期次生 100 5.3 83.9 10.7 -16.4 173.7~175.4(175)
      XD09 1 345.0 裂缝方解石脉 气液两相 晚期次生 0.09 99.91 24.6 23.7 43.0 8.7 -17.1 198.6~205.4(201)
      XD10 1 345.0 裂缝方解石脉 气液两相 晚期次生 100 43.1 56.9 -17.9 183.6~186.4(185)
      下载: 导出CSV
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