斜井和水平井补偿中子测井分辨率改进及应用

斜井和水平井补偿中子测井分辨率改进及应用

于华伟¹,孙建孟¹, 赖富强¹,王敏¹,杨锦舟²

1.中国石油大学地球资源与信息学院，山东东营 257061;2.胜利油田钻井工艺研究院，山东东营 257000

收稿日期:2008-09-23 修回日期:1900-01-01 出版日期:2009-03-26 发布日期:2009-03-26
通讯作者: 于华伟

Improving Compensated Neutron Log Vertical Resolution Under Deviated and Horizontal Well Conditions and Its Application

YU Hua-wei¹，SUN Jian-meng¹, LAI Fu-qiang¹, WANG Min¹, YANG Jin-zhou²

1.College of Geo-Resources and Information, China University of Petroleum, Dongying, Shandong 257061, China;2.Drilling Technology Research Institute，Shengli Oilfield Company，Dongying, Shandong 257000, China

Received:2008-09-23 Revised:1900-01-01 Online:2009-03-26 Published:2009-03-26
Contact: YU Hua-wei

摘要/Abstract

摘要： 为了合理提高斜井和水平井条件下补偿中子测井曲线的纵向分辨率，利用蒙特卡罗模拟研究了在不同井斜角情况下CN241补偿中子测井仪器的纵向几何因子，把几何因子作为仪器响应函数系数，在模拟地层和实际地层中利用分辨率匹配技术对测井曲线进行了分辨率提高处理，并对改进前后的处理结果进行了比较。通过研究得到了不同井斜角下的补偿中子测井的纵向几何因子，验证了在斜井和水平井中使用垂直井的几何因子进行分辨率匹配处理存在较大误差，在40 cm厚地层中误差最大达10 p.u，改进后的结果与改进前相比降低了误差、提高了数据精度。研究结果表明：随着井斜角的不同，仪器的纵向几何因子也不同，要在斜井和水平井中合理进行分辨率提高处理，应该使用对应井斜角的几何因子作为响应函数系数。

关键词: 补偿中子测井, 蒙特卡罗模拟, 几何因子, 垂直分辨率

Abstract: In order to reasonably improve the vertical resolution of the compensated neutron log (CNL) in deviated and horizontal well, Monte Carlo simulation was applied to study the vertical geometrical factors of CN241 tool in the well of different deviation angle. The geometrical factor was regarded as response function coefficient, and resolution matching method was used to improve the resolution of the log curves in simulated formation and true formation. The vertical geometrical factors obtained from the simulation data proved that there would be some error when the geometrical factor of vertical well was applied to deviated or horizontal well, and the maximum porosity error could be as high as 10％ when the formation thickness is 40 cm. The results also showed that geometrical factors were different with different deviation angles, therefore the corresponding geometrical factor should be used as response function coefficient when to improve CNL resolution of deviated or horizontal well.

Key words: compensated neutron log, Monte Carlo simulation, geometric factor, vertical resolution

中图分类号:

P631.81

于华伟,孙建孟, 赖富强,王敏,杨锦舟. 斜井和水平井补偿中子测井分辨率改进及应用[J]. J4, 2009, 39(2): 334-0341.

YU Hua-wei，SUN Jian-meng, LAI Fu-qiang, WANG Min, YANG Jin-zhou. Improving Compensated Neutron Log Vertical Resolution Under Deviated and Horizontal Well Conditions and Its Application[J]. J4, 2009, 39(2): 334-0341.

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