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随钻电磁波电阻率测井是目前国内实时评价地层含油性和地质导向的主要方法,其在地层界面附近的响应特征是判定实际地层产状、实施地质导向的根本依据.因此研究地层产状因素对随钻电磁波测井响应的影响特征和规律,对判定地层界面、调整地层模型有重要的意义.本文以哈利伯顿EWR—PHASE4单发双收仪器为例,利用ANSYS软件采用矢量有限元方法对不同地层条件下的响应特征进行了三维数值模拟.数值模拟过程中通过控制网格大小,在保证计算精度的前提下减小计算规模、提高计算速度.最终得出了目的层厚度、倾角以及与围岩电阻率比值等因素对随钻电磁波测井响应的影响特征和规律,指出了犄角信号出现的条件,为随钻测井过程中实时正确判识地层产状提供了理论依据.
The electromagnetic wave resistivity logging while drilling is the main method of real-time evaluation of oil-bearing and geosteering in the strata. The response characteristics near the stratigraphic interface is the fundamental basis for determining the actual stratigraphy and implementing geosteering. Therefore, It is of great significance to determine the formation interface and adjust the formation model for the characteristics and laws of the response of the logging while drilling electromagnetic wave.In this paper, taking Haliburton EWR-PHASE4 single double receiver as an example, using ANSYS software vector finite element Method was used to simulate the response characteristics under different formation conditions by controlling the grid size and reducing the computational scale and increasing the computational speed under the premise of ensuring the accuracy of the calculation.Finally, And the ratio of surrounding rock resistivity to the logging response of the electromagnetic wave while it is drilling are studied. The conditions for the occurrence of the 犄 angle signal are pointed out. This provides a theoretical basis for correctly identifying the occurrence of the formation during the logging while drilling.