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    鄂尔多斯盆地中部地区马家沟组断裂控制天然气运移方向的流体包裹体证据

    冯艳伟 陈勇 赵振宇 刘听雨 雷静 钟升 王淼 李冠华 裴仰文

    冯艳伟, 陈勇, 赵振宇, 刘听雨, 雷静, 钟升, 王淼, 李冠华, 裴仰文, 2021. 鄂尔多斯盆地中部地区马家沟组断裂控制天然气运移方向的流体包裹体证据. 地球科学, 46(10): 3601-3614. doi: 10.3799/dqkx.2020.384
    引用本文: 冯艳伟, 陈勇, 赵振宇, 刘听雨, 雷静, 钟升, 王淼, 李冠华, 裴仰文, 2021. 鄂尔多斯盆地中部地区马家沟组断裂控制天然气运移方向的流体包裹体证据. 地球科学, 46(10): 3601-3614. doi: 10.3799/dqkx.2020.384
    Feng Yanwei, Chen Yong, Zhao Zhenyu, Liu Tingyu, Lei Jing, Zhong Sheng, Wang Miao, Li Guanhua, Pei Yangwen, 2021. Migration of Natural Gas Controlled by Faults of Majiagou Formation in Central Ordos Basin: Evidence from Fluid Inclusions. Earth Science, 46(10): 3601-3614. doi: 10.3799/dqkx.2020.384
    Citation: Feng Yanwei, Chen Yong, Zhao Zhenyu, Liu Tingyu, Lei Jing, Zhong Sheng, Wang Miao, Li Guanhua, Pei Yangwen, 2021. Migration of Natural Gas Controlled by Faults of Majiagou Formation in Central Ordos Basin: Evidence from Fluid Inclusions. Earth Science, 46(10): 3601-3614. doi: 10.3799/dqkx.2020.384

    鄂尔多斯盆地中部地区马家沟组断裂控制天然气运移方向的流体包裹体证据

    doi: 10.3799/dqkx.2020.384
    基金项目: 

    国家自然科学基金-石油化工联合基金(A类)培育项目 U1762108

    国家自然科学基金面上基金项目 41873070

    国家重大科技专项 2016ZX05004

    详细信息
      作者简介:

      冯艳伟(1994-), 在读博士, 主要从事流体包裹体方面的研究工作.ORCID: 0000-0002-1930-7737.E-mail: fengyw1994@outlook.com

    • 中图分类号: P618.13

    Migration of Natural Gas Controlled by Faults of Majiagou Formation in Central Ordos Basin: Evidence from Fluid Inclusions

    • 摘要: 为研究鄂尔多斯盆地中部地区马家沟组成藏期次和天然气运移方向与断裂活动的相关性,利用流体包裹体岩相学观察、激光拉曼光谱分析、均一温度和冰点温度的测定以及热力学PVT模拟方法对奥陶系马家沟组马五段储层的岩心样品进行了成分、温度和压力的测定与恢复.结果表明:构造裂缝脉体中充填的矿物为方解石、白云石和菱镁矿;脉体中共有4类流体包裹体,分别为富甲烷气体包裹体、含CO2富甲烷气体包裹体、含甲烷盐水包裹体和盐水包裹体,这4类流体包裹体均存在于方解石脉体中;构造裂缝脉体和溶孔中含甲烷流体包裹体的均一温度在130.1~179.6 ℃之间,与含甲烷流体包裹体同期的盐水包裹体的均一温度范围为112.3~173.3 ℃.结合生排烃史和埋藏史,证明早白垩世是马家沟组天然气的主要成藏期.沿断裂分布的各井的捕获压力和压力系数呈现由西南向东北递减的趋势,早白垩世的构造运动在北东向的断层中产生大量构造裂缝,为天然气的运移提供了通道,证明含甲烷的流体沿北东向断裂运移并充注成藏.

       

    • 图  1  鄂尔多斯盆地断层展布图(据马润勇等(2009), 有修改)

      Fig.  1.  The distribution of faults in Ordos basin (modified according to Ma et al.(2009))

      图  2  马家沟组马五段岩性剖面图(据杨华等(2011)修改)

      Fig.  2.  Lithology profile of the Member-5 of the Majiagou Formation(modified according to Yang et al.(2011))

      图  3  储层岩心中发育的构造缝(红框代表制片位置)

      Fig.  3.  Structural fractures developed in the drilling core

      图  4  脉体矿物中的包裹体镜下照片及其拉曼谱图

      a1.桃36井,3 330.7 m,单偏光;a2.桃36井,3 330.7 m,拉曼谱图;b1.苏126井,4 225.8 m,单偏光;b2.苏126井,4 225.8 m,拉曼谱图;c1.莲63井,4 200.0 m,单偏光;c2.莲63井,4 200.0 m,拉曼谱图

      Fig.  4.  Micrographs and Raman spectra of inclusions in vein minerals

      图  5  不同类型流体包裹体的显微照片及拉曼谱图

      a1,a2. 富甲烷气体包裹体(莲15井,4 276.6 m),单偏光及拉曼谱图;b1,b2. 含CO2富甲烷气体包裹体(莲63井,4 204.0 m),单偏光及拉曼谱图;c1,c2. 含甲烷盐水包裹体(莲19井,4 153.2m),单偏光及拉曼谱图;d1,d2. 盐水包裹体(统49井,3 039.5 m),单偏光及拉曼谱图

      Fig.  5.  Micrographs and Raman spectra of different type fluid inclusions

      图  6  下古生界油气成藏模式(据戚家振和过敏,2017

      Fig.  6.  Hydrocarbon accumulation model of Lower Paleozoic (after Qi and Guo, 2017)

      图  7  研究区储层埋藏史与流体包裹体均一温度直方图

      a.莲15井;b.莲19井;c.莲81井;d.统49井

      Fig.  7.  Burial history of strata in study area and histogram of homogeneous temperature of fluid inclusions

      图  8  天然气运移方向

      a.成藏压力平面分布与天然气运移方向;b.压力系数平面分布与天然气运移方向

      Fig.  8.  Migration of natural gas

      表  1  关键成藏期流体压力峰值

      Table  1.   Fluid pressure peaks in critical gas accumulation stages

      井号 层位 深度(m) 古埋深(m) 压力峰值(中值)(MPa) 压力系数(中值)
      莲15 马五6 4 274.20 4 019.4 46.8 1.188
      莲17 马五段 4 003.20~4 031.80 3 952.8 45.0 1.175
      莲19 马五5-2 4 090.60~4 091.30 3 977.8~4 047.2 48.5 1.220
      莲58 马五5-2 3 970.00 3 902.8 45.3 1.187
      莲63 马五段 4 199.30~4 204.00 3 880.6~3 947.2 48.1 1.265
      莲81 马五7 4 138.76 4 278.4 46.7 1.150
      苏126 马五段 4 161.60~4 164.50 4 130.6~4 286.1 45.5 1.163
      桃15 马五段 3 588.20 3 466.7 39.1 1.153
      桃16 马五段 3 615.00 3 761.8 44.4 1.206
      桃36 马五段 3 328.60~3 335.15 3 148.6~3 451.4 37.2 1.152
      桃50 马四、
      马五1-2
      3 363.31~3 627.42 3 288.9~3 561.1 36.0 1.131
      统47 马五4-2 3 039.23~3 043.00 3 153.6~3 156.5 35.0 1.113
      统49 马五3-1、
      马五5
      3 048.30~3 116.20 3 098.6~3 255.1 35.5 1.122
      统50 马五1-2 3 165.14 3 251.4 35.8 1.150
        注:表中的多口井具有多个深度的样品,计算得到多个压力及压力系数,取其中值投点.其中莲17、莲19、莲63、苏126、桃36、统47具有2个深度的样品,桃50、统49具有2个深度的样品.
      下载: 导出CSV
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    • 收稿日期:  2020-11-14
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