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孔中电极附近成像效果差的问题是一直以来困扰三维电阻率CT精细探测的难题,针对该问题,提出了“距离加权”约束反演的思路,通过构建“指数型”衰减的距离加权因子分布模型,对距孔中电源点不同远近的剖分单元赋予差异权重,重点改善了孔中电源点附近区域反演敏感度较高而造成的成像形态畸变问题,提高了三维电阻率CT反演成像方法对异常体三维定位和识别的精度及可靠性。通过数值反演试验和物理模型试验研究,进一步检验了距离加权约束反演方法在改善孔中电极附近异常体成像形态方面的有益效果,试验结果均比较准确地反映了异常体的空间位置、规模和形态。
The problem of poor imaging near the electrodes in the hole is a difficult problem that has troubled the precision detection of three-dimensional resistivity CT. In order to solve this problem, the idea of “distance weighting” constraint inversion is proposed. By constructing “exponential” attenuation The distance weighting factor distribution model gives different weights to the subdivision units located at different distances from the power point in the hole, and focuses on improving the imaging distortion caused by high inversion sensitivity near the power point in the hole, and improves the three-dimensional resistivity Accuracy and Reliability of CT Inversion Imaging for 3D Anomaly Location and Recognition. Through the numerical inversion experiment and the physical model test, the beneficial effects of the distance-weighted constrained inversion method in improving the imaging morphology of the anomalous body in the hole near the electrode are further tested. The test results more accurately reflect the spatial location and scale of the anomalous body And form.