随钻电磁波测井地层产状因素响应特征三维数值模拟

发布时间：2018-05-12 08:09

本文选题：随钻电磁波测井 + 地层产状　；参考：《地球物理学进展》2017年01期

【摘要】：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.
[Abstract]:Electromagnetic resistivity logging while drilling is the main method for real-time evaluation of oil content and geological guidance in China. Its response near the formation interface is the fundamental basis for determining the actual formation occurrence and implementing geological guidance. Therefore, it is of great significance to study the influence characteristics and rules of formation occurrence factors on the response of electromagnetic logging while drilling, to judge the formation interface and adjust the formation model. Taking Halliburton EWR-PHASE4 single and double receiver as an example, three dimensional numerical simulation of response characteristics under different stratum conditions has been carried out by using ANSYS software using vector finite element method. In the process of numerical simulation, by controlling the mesh size, the calculation scale is reduced and the calculation speed is improved under the premise of ensuring the calculation accuracy. Finally, the effects of the thickness of target layer, inclination angle and resistivity ratio to surrounding rock on the response of electromagnetic logging while drilling are obtained, and the conditions for the appearance of horn signals are pointed out. It provides a theoretical basis for recognizing formation occurrence in real time and correctly in the process of logging while drilling.
【作者单位】：中国石油大学(华东)地球科学与技术学院;
【基金】：国家油气重大专项(2017ZX05009-003)资助
【分类号】：P631.811

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