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    油气藏全空间磁学、地球化学与矿物学结构及意义——检验“烟筒效应”的形成机理

    刘庆生 李海侠 王芳 田志 王艾红 陈龙生 张双喜 夏响华 程同锦

    刘庆生, 李海侠, 王芳, 田志, 王艾红, 陈龙生, 张双喜, 夏响华, 程同锦, 2002. 油气藏全空间磁学、地球化学与矿物学结构及意义——检验“烟筒效应”的形成机理. 地球科学, 27(5): 637-644.
    引用本文: 刘庆生, 李海侠, 王芳, 田志, 王艾红, 陈龙生, 张双喜, 夏响华, 程同锦, 2002. 油气藏全空间磁学、地球化学与矿物学结构及意义——检验“烟筒效应”的形成机理. 地球科学, 27(5): 637-644.
    LIU Qing-sheng, LI Hai-xia, WANG Fang, TIAN Zhi, WANG Ai-hong, CHEN Long-sheng, ZHANG Shuang-xi, XIA Xiang-hua, CHENG Tong-jin, 2002. Magnetic, Geochemical and Mineralogical Structure and Significance in Complete Space of Oil and Gas Reservoir: Implications for Formation Mechanism of 'Chimney Effect. Earth Science, 27(5): 637-644.
    Citation: LIU Qing-sheng, LI Hai-xia, WANG Fang, TIAN Zhi, WANG Ai-hong, CHEN Long-sheng, ZHANG Shuang-xi, XIA Xiang-hua, CHENG Tong-jin, 2002. Magnetic, Geochemical and Mineralogical Structure and Significance in Complete Space of Oil and Gas Reservoir: Implications for Formation Mechanism of "Chimney Effect. Earth Science, 27(5): 637-644.

    油气藏全空间磁学、地球化学与矿物学结构及意义——检验“烟筒效应”的形成机理

    基金项目: 

    国家自然科学基金项目 49874026

    国家自然科学基金项目 49374216

    详细信息
      作者简介:

      刘庆生(1947-), 男, 教授, 博士生导师, 1970年毕业于北京地质学院地球物理勘探系, 现从事固体地球物理学的基础理论与应用研究

    • 中图分类号: P574.1;P618.130.2

    Magnetic, Geochemical and Mineralogical Structure and Significance in Complete Space of Oil and Gas Reservoir: Implications for Formation Mechanism of "Chimney Effect

    • 摘要: 位于松辽盆地南部某油气田边缘一个油气显示井的磁性测量结果表明, 岩石具有明显的磁性变异结构特征.以磁化率(κ) 为例, 在低缓的背景磁性上主要呈现高强度与中等强度的2类异常: 大于400× 10-5为强磁性, 100× 10-5~ 150× 10-5为中等强度磁性.结合录井资料与地球化学分析解释可知, 强磁性异常主要位于取样间隔的底部干层区, 少数样品位于浅部油气显示层; 中等强度异常主要位于2 70 0m附近的油气显示层.岩石磁性与地球化学成分对应分析表明, 油气显示层岩石的C1和C2成分与磁化率(κ)、饱和磁化强度(Js) 和饱和等温剩余磁化强度(SIRM) 之间呈明显的正相关, 与内禀矫顽力(Hc) 为逆相关, 而干层岩石相关性不明显.矿物成分分析显示, 岩石中主要含铁矿物为磁铁矿、磁赤铁矿、赤铁矿、黄铁矿和菱铁矿.其中磁赤铁矿主要分布在具有中等磁性强度的油气显示层, 而高含量(最高含量达12.5 %) 的磁铁矿主要位于底部干层.磁赤铁矿与赤铁矿、黄铁矿及菱铁矿含量之间相关特征初步表明, 自生磁赤铁矿可能主要来源于原地赤铁矿与黄铁矿.推测油气显示层岩石中磁性偏软的磁赤铁矿属于烃蚀变的产物, 为烃微渗漏效应(或烟筒效应) 的全空间形成机理提供了新证据

       

    • 图  1  岩石磁性随深度的变化曲线

      Fig.  1.  Magnetism of samples changing with depth

      图  2  烃成分随深度变化曲线

      a1, a2.顶空气烃成分; b1, b2.吸附烃成分

      Fig.  2.  Geochemical compositions of samples changing with depth

      图  3  含铁矿物含量随深度的变化曲线

      a.磁铁矿; b.磁赤铁矿; c.赤铁矿; d.菱铁矿; e.黄铁矿

      Fig.  3.  Scatter plots of iron-bearing minerals content changing with depth

      图  4  磁性参量与烃成分之间的相互关系

      a1—a8.全部油气显示层; b1—b8.全部干层

      Fig.  4.  Scatter plots of relations between magnetic parameters and hydrocarbon compositions

      图  5  磁赤铁矿与赤铁矿(a)、菱铁矿(b) 及黄铁矿(c) 含量相互关系

      Fig.  5.  Relationship of contents between maghemite and hematite (a), siderite (b) and pyrite (c)

      表  1  主要代表性层位样品磁性参量的统计值

      Table  1.   Magnetic parameters of rocks

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    • 收稿日期:  2002-06-18
    • 刊出日期:  2002-09-25

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