發(fā)布時(shí)間：2018-12-10 10:20

【摘要】：視磁化強(qiáng)度反演,是利用在觀測(cè)面采集的實(shí)際磁力數(shù)據(jù)來(lái)反推地下異常體的磁性參數(shù)以及空間賦存狀態(tài)的一種地球物理手段,它是地球物理勘探的重要手段之一,由于反演得到的磁化強(qiáng)度是相對(duì)值,而非地下異常體的磁化強(qiáng)度真實(shí)值,因此稱之為“視”磁化強(qiáng)度反演。這種方法的基本思想就是對(duì)地下待反演地質(zhì)體進(jìn)行網(wǎng)格剖分,通過(guò)不停的反演迭代直至達(dá)到精度要求,來(lái)計(jì)算出所有剖分網(wǎng)格單元的視磁化強(qiáng)度。這種計(jì)算方法的主要問(wèn)題就是反演多解性嚴(yán)重:第一、觀測(cè)磁異常是地下的空間體積效應(yīng);第二、采集的數(shù)據(jù)是離散的而不是連續(xù)的。因此,如何降低反演多解性的影響,提高反演成像的精度,一直以來(lái)都是視磁化強(qiáng)度反演問(wèn)題中的重中之重。針對(duì)磁反演的多解性問(wèn)題,本文提出了基于正則化下延方法的視磁化強(qiáng)度全空間反演。其核心思想是通過(guò)對(duì)觀測(cè)面磁異常場(chǎng)進(jìn)行正則化向下延拓,得到不同深度的磁場(chǎng)分布,通過(guò)結(jié)合觀測(cè)場(chǎng)和下延場(chǎng)的異常數(shù)據(jù),來(lái)增大反演原始數(shù)據(jù)量;此外,當(dāng)場(chǎng)源埋深較大時(shí),在地表觀測(cè)到的異常信號(hào)較弱,而通過(guò)正則化下延所得到的下延磁異常場(chǎng),可以在深度上更接近異常體賦存位置,有利于突出異常信號(hào)。該方法的關(guān)鍵是保證觀測(cè)磁異常場(chǎng)的正則化下延精度,重點(diǎn)是反演目標(biāo)函數(shù)的構(gòu)建。理論模型試驗(yàn)結(jié)果表明,利用本文提出的方法所進(jìn)行的視磁化強(qiáng)度反演,其反演精度要明顯高于僅用觀測(cè)場(chǎng)數(shù)據(jù)進(jìn)行反演而得到的結(jié)果。尤其在存在多個(gè)不等深場(chǎng)源體情況下,其反演得到的異常體位置較傳統(tǒng)方法相比更接近異常體的真實(shí)賦存位置,這說(shuō)明該方法在縱向分辨能力上有顯著提高。對(duì)北三臺(tái)地區(qū)實(shí)際資料進(jìn)行了處理,反演得到研究區(qū)的視磁化強(qiáng)度三維空間分布,并對(duì)火成巖進(jìn)行圈定,結(jié)果與實(shí)際鉆井資料基本吻合,進(jìn)一步驗(yàn)證了方法的實(shí)用性。
[Abstract]:The inversion of apparent magnetization is a geophysical method which uses the actual magnetic data collected on the observational plane to push back the magnetic parameters and the spatial occurrence state of the underground anomalous body. It is one of the important means of geophysical exploration. Because the magnetization obtained by inversion is a relative value, but not the true value of the magnetization of an underground anomaly, it is called "apparent" magnetization inversion. The basic idea of this method is to mesh the geological bodies to be retrieved, and to calculate the apparent magnetization of all the meshes by continuous inversion iteration until the precision is reached. The main problem of this method is that the inversion multi-solution is serious: first, the observed magnetic anomaly is the volume effect of underground space; second, the collected data is discrete rather than continuous. Therefore, how to reduce the influence of inversion multi-solution and improve the accuracy of inversion imaging has always been the most important problem in the inversion of apparent magnetization. Aiming at the multi-solution problem of magnetic inversion, this paper presents a full-space inversion of apparent magnetization based on regularized downscaling method. The core idea is to obtain the magnetic field distribution of different depths by regularizing the anomalous magnetic field of the observation surface, and to increase the original data by combining the anomaly data of the observation field and the downgoing field. In addition, the anomalous signals observed on the surface of the earth are weaker when the depth of the source is larger on the spot, and the anomalous magnetic field obtained by regularizing the downward continuation can be closer to the location of the anomalous body in depth, which is advantageous to outburst the abnormal signal. The key point of this method is to ensure the regularization and downscaling accuracy of the observed magnetic anomaly field, with emphasis on the construction of the inversion objective function. The experimental results of theoretical model show that the inversion accuracy of apparent magnetization inversion based on the method proposed in this paper is obviously higher than that obtained by only using the observational field data. Especially in the case of multiple source bodies with unequal depth, the position of anomalous bodies obtained by inversion is closer to the real location of anomalous bodies than that of traditional methods, which indicates that the vertical resolution of this method is improved significantly. The actual data of Beisantai area are processed and the 3-D spatial distribution of apparent magnetization is obtained by inversion. The igneous rocks are delineated. The results are in good agreement with the actual drilling data, which further verifies the practicability of the method.
【學(xué)位授予單位】：中國(guó)石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P631

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