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随着中国经济的发展,油气资源成为制约我国发展主要瓶颈之一.电性源瞬变电磁在油气资源的勘探中取得了不错效果.为此本文开展了对电性源瞬变电磁的相关研究,本文首先对电性源瞬变电磁的两种主要模拟方法,G-S变换和余弦变换做了对比,认为GS变换结果精度较余弦变换精度要高.为了实际工作中解释的方便,又分别定义了电性源瞬变电磁各场视电阻率,为其解释带来了方便.最后,本文对其参数的选择进行了较详细的研究,通过时电性源赤道装置与偶极装置的对比研究,表明赤道装置可以对地下结构取得较好的探测效果,偶极装置可以取得较高噪比的数据.通过对激励源的研究表明,阶跃激励源激发的场视电阻率很好地反映了地质结构的变化,而脉冲波激发的场对异常体反映明显.通过对Hz场和Ex场的研究表明,Hz场在小收发距时即可进行大深度探测,并具有较高的信噪比,Ex场则对高阻体探测效果非常突出.
With the development of China’s economy, oil and gas resources have become one of the main bottlenecks restricting the development of our country.Electrical source transient electromagnetic (EMT) has achieved good results in the exploration of oil and gas resources.Therefore, , This paper first compares the two main simulation methods of transient electromagnetic field of electric source, GS transform and cosine transform, and considers that the accuracy of GS transform is higher than that of cosine transform.In order to explain the convenience in practical work, The apparent resistivity of the electromagnetic transient field of the electrical source brings convenience to the explanation.Finally, the choice of the parameters is studied in more detail in this paper. By comparing the electrical source equatorial device with the dipole device, Indicating that the equatorial device can achieve better detection effect on the underground structure and the dipole device can obtain the data with higher noise ratio.Studies on the excitation sources show that the field apparent resistivity excited by the step excitation source well reflects the geology Structure, and the field excited by pulse wave reflects the abnormal body clearly.According to the research of the Hz field and the Ex field, it can be found that the Hz field can be used for deep exploration with a small distance Noise ratio, Ex field is very high impedance detection effect is very prominent.