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首页> 外文期刊>Geophysics: Journal of the Society of Exploration Geophysicists >Geophysical helicopter-based magnetic methods for locating wellsMagnetic detection of wells
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Geophysical helicopter-based magnetic methods for locating wellsMagnetic detection of wells

机译：基于地球物直升机的磁性方法，用于定位井上的井开阔的探测

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We studied the problem of determining accurately the location of abandoned and sometimes undocumented wells and the challenging and increasingly important task related to subsurface reservoir integrity and regional economic development. We reviewed a variety of semiquantitative methods based on geophysical workflows, and we tested these with airborne magnetic data collected at two field sites. Our main conclusion is that airborne magnetic surveys represent a high-value tool to aid in the accurate determination of abandoned well locations and characteristics. At one site, two surveys were collected at slightly different altitudes to compare workflow robustness and allow the observed vertical magnetic gradient to be included in well detection workflows. We also investigated using focal zone anomaly statistics (using the magnetic field intensity and its first and second horizontal derivatives), analytic signal, tilt derivative, and calculated vertical gradient. In addition, we used a 3D inversion of a small subset of data to investigate the successful recovery of well-related magnetic susceptibility distribution and estimate subsurface well topology. The recovered magnetic susceptibility volume showed distinctive vertically elongated objects that correspond to known wells. Maximum likelihood estimation and confidence calculations were then applied to these data sets and indicated that high-confidence well locations could be determined and characterized using such airborne total magnetic data.
机译：我们研究了准确地确定废弃有时无证井的位置以及与地下水库完整性和区域经济发展有关的挑战和越来越重要的任务。我们介绍了基于地球物理工作流程的各种半定量方法，我们用在两个场地收集的空气磁性数据进行了测试。我们的主要结论是，机载磁力调查代表了一种高价值工具，以帮助准确地确定废弃的井位置和特性。在一个网站上，在稍微不同的高度上收集两个调查，以比较工作流稳健性并允许观察到的垂直磁梯度在井检测工作流程中包括。我们还研究了使用焦区异常统计（使用磁场强度及其第一和第二水平衍生物），分析信号，倾斜导数和计算垂直梯度。此外，我们使用了一小部分数据的3D反转来研究与良好相关的磁化率分布和估计地下井拓扑的成功恢复。回收的磁化率容积显示出与已知孔对应的独特垂直细长的物体。然后将最大似然估计和置信度计算应用于这些数据集，并指出可以使用这种空气传播的总磁数据来确定和表征高档位阱位置。

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