【摘要】：瞬變電磁法(Transient Electromagnetic Methods,簡(jiǎn)稱TEM)因?qū)Φ妥梵w反應(yīng)敏感而在水文地質(zhì)調(diào)查中得到了廣泛的應(yīng)用。磁性大定源TEM以其施工效率高、探測(cè)深度大及成本低而成為常用的一種施工方式。論文從瞬變電磁勘探原理出發(fā),研究了磁性大定源的瞬變電磁響應(yīng)特征,取得了以下成果:(1)以麥克斯韋基本方程為基礎(chǔ),從瞬變電磁理論出發(fā),推導(dǎo)了磁性源瞬變電磁大定源響應(yīng)計(jì)算公式;(2)在平面直角坐標(biāo)系下,將磁性源的大線框TEM響應(yīng)剖分成電偶極子瞬變電磁響應(yīng)疊加,在計(jì)算單個(gè)電偶極子對(duì)坐標(biāo)系中某一點(diǎn)的響應(yīng)值后,累加積分求出總響應(yīng)值;(3)利用二分法,編程計(jì)算出磁性源TEM響應(yīng)的全區(qū)視電阻率,針對(duì)雙解問題,論文通過研究分析,給出了判別方法:早期利用磁場(chǎng)積分判別,晚期則利用中心回線晚期計(jì)算法判別;(4)研究了磁性大定源TEM響應(yīng)的空間分布情況,通過改變線框大小以及模型的電阻率參數(shù)值,分析邊界影響問題和響應(yīng)值的變化特征;(5)編寫相關(guān)計(jì)算程序。通過不同地電模型正演和實(shí)例驗(yàn)證,表明了本文大定源TEM視電阻率計(jì)算程序的穩(wěn)定性和有效性;研究表明,大定源TEM全區(qū)視電阻率計(jì)算法能將淺部地層的地電特性較好的反應(yīng)出來,對(duì)電性層的劃定效果更好。
[Abstract]:Transient electromagnetic method (Transient Electromagnetic Methods,) is widely used in hydrogeological survey because of its sensitivity to low resistivity body reaction. Magnetic fixed source TEM has become a common construction method because of its high construction efficiency, high detection depth and low cost. Based on the principle of transient electromagnetic exploration, the characteristics of transient electromagnetic response of magnetic source are studied in this paper. The results are as follows: (1) based on Maxwell's basic equation and transient electromagnetic theory, The formula for calculating the response of transient electromagnetic large fixed source of magnetic source is derived. (2) in the plane rectangular coordinate system, the TEM response of the large wire frame of the magnetic source is divided into the superposition of the transient electromagnetic response of the electric dipole. After calculating the response value of a single electric dipole to a point in the coordinate system, the total response value is calculated by the accumulative integral; (3) the whole area apparent resistivity of TEM response of magnetic source is calculated by programming by using dichotomy method. Aiming at the problem of double solution, the paper gives the discriminant method through research and analysis: early discrimination by using magnetic field integral, In the later stage, the central loop was used to calculate the late stage. (4) the spatial distribution of the TEM response of the magnetic large fixed source is studied. By changing the size of the wire frame and the resistivity parameter of the model, the problem of boundary influence and the variation characteristics of the response value are analyzed. (5) the relevant calculation program is compiled. Through the forward modeling of different geoelectric models and the verification of examples, it is shown that the stability and effectiveness of the TEM apparent resistivity calculation program with large fixed source is demonstrated in this paper. The results show that the calculation method of apparent resistivity in the whole area of Dadingyuan TEM can better reflect the geoelectric characteristics of shallow strata, and the delineation effect of electric layer is better.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P631.325

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