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    随钻中子孔隙度测井响应特性数值模拟

    袁超 李潮流 周灿灿 张锋

    袁超, 李潮流, 周灿灿, 张锋, 2014. 随钻中子孔隙度测井响应特性数值模拟. 地球科学, 39(12): 1896-1902. doi: 10.3799/dqkx.2014.174
    引用本文: 袁超, 李潮流, 周灿灿, 张锋, 2014. 随钻中子孔隙度测井响应特性数值模拟. 地球科学, 39(12): 1896-1902. doi: 10.3799/dqkx.2014.174
    Yuan Chao, Li Chaoliu, Zhou Cancan, Zhang Feng, 2014. Numerical Simulation of Response Characteristic of Neutron Porosity Logging While Drilling. Earth Science, 39(12): 1896-1902. doi: 10.3799/dqkx.2014.174
    Citation: Yuan Chao, Li Chaoliu, Zhou Cancan, Zhang Feng, 2014. Numerical Simulation of Response Characteristic of Neutron Porosity Logging While Drilling. Earth Science, 39(12): 1896-1902. doi: 10.3799/dqkx.2014.174

    随钻中子孔隙度测井响应特性数值模拟

    doi: 10.3799/dqkx.2014.174
    基金项目: 

    国家重大油气专项 2011ZX0520-008

    国家重大油气专项 2011ZX05020-002

    国家自然科学基金项目 41374125

    详细信息
      作者简介:

      袁超(1987-), 男, 博士在读, 主要从事核测井方法基础研究、核测井数据处理及应用.E-mail: vipyuanchao@163.com

    • 中图分类号: TE132

    Numerical Simulation of Response Characteristic of Neutron Porosity Logging While Drilling

    • 摘要: 随钻中子孔隙度测井在随钻地层评价中发挥重要作用, 对其响应特性研究具有重要意义.利用蒙特卡罗方法建立随钻条件下地层模型, 模拟研究随钻中子孔隙度测井响应特性.模拟结果表明: 随钻和电缆测井相同条件下中子孔隙度响应变化趋势相同, 随钻中子孔隙度曲线反映孔隙度灵敏程度高于电缆测井, 但其测井响应受钻铤影响较大; 探测深度与地层孔隙度有关, 文中条件下探测深度和纵向分辨率分别为28 cm和19 cm; 在水平井和大斜度井中, 测量方位对中子孔隙度曲线影响较大; 相对倾角α越小, 中子孔隙度曲线过渡区域中点越接近地层界面; α小于60°时, 中子孔隙度曲线受围岩影响可忽略.

       

    • 图  1  单个中子与物质的随机作用过程

      作用过程:1.非弹性散射;2.裂变;3.种子俘获;4.中子逃逸;5.光子散射;6.光子逃逸;7.光子俘获

      Fig.  1.  Random action process of one neutron with materials

      图  2  蒙特卡罗计算模型示意图

      Fig.  2.  Schematic diagram of Monte Carlo simulation model

      图  3  随钻与电缆测井中子孔隙度响应关系对比

      Fig.  3.  Comparison of neutron porosity response between LWD and wireline

      图  4  随钻和电缆测井中子孔隙度绝对灵敏度(a)和相对灵敏度(b)随孔隙度变化曲线

      Fig.  4.  Relationship of absolute and relative sensitivity to neutron porosity in LWD and WL logging

      图  5  α=0时视中子孔隙度模拟计算值与测量参考点关系曲线

      Fig.  5.  Relation of simulated value of apparent porosity and reference point for measurement when α=0

      图  6  仪器穿过不同距离砂岩目的层时中子孔隙度响应曲线

      Fig.  6.  Porosity response curve when tool travels through target sand formation with different intervals

      图  7  相对倾角为10°(a)和85°(b)时仪器穿过地层界面不同测量方位中子孔隙度响应曲线

      Fig.  7.  Porosity response curve of different measurement azimuth when tool travels through boundary surface with relative angle of 10° and 85 °

      图  8  不同相对倾角条件下仪器穿过地层界面时中子孔隙度响应曲线

      Fig.  8.  Porosity response curve when tool travels through boundary surfaces with different relative dips

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    • 收稿日期:  2014-03-04
    • 刊出日期:  2014-12-01

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