本文選題：重力異常 + 等效源法　； 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：地球物理勘探的最終目的,就是要根據(jù)獲得的地球物理場的信息(異常)來求取引起該異常的地下場源體的空間位置、大小、形狀、物性參數(shù)等,該工作稱為地球物理反演。目前的反演方法種類比較多,但是一切反演計(jì)算都存在多解性,為了克服、或者減少反演的多解性,這是地球物理工作者長期討論、研究的課題。本論文利用等效源二維板模型進(jìn)行二維重力位場反演,求出質(zhì)量并進(jìn)行成像,以獲得有關(guān)引起該重力異常的地下場源體的分布,以及判定其空間位置、形狀大小、物性參數(shù)等。二維反演中的正演模型以前多用水平圓柱體模型,而水平圓柱體對于任意截面形狀的擬合遠(yuǎn)不如用二維板的擬合度高。論文首先在深入學(xué)習(xí)了有關(guān)重力勘探、反演理論、等效源方法理論及技術(shù)的基礎(chǔ)上,然后編寫了以二維板作為模型的等效源反演成像計(jì)算程序,先進(jìn)行了分別以直立板、重力傾斜板、任意多邊形截面等一系列的理論模擬試驗(yàn)及分析;在反演中,對于等效源的設(shè)計(jì)與安排分單層與多層進(jìn)行研究,設(shè)計(jì)單層等效源反演成像的結(jié)果能夠把水平疊加的地質(zhì)體分離開來,同時(shí)可以確定地質(zhì)體的產(chǎn)狀;多層能夠確定地質(zhì)體的空間位置、形狀大小、物性等。同時(shí)重點(diǎn)研究了帶地形的反演成像,其效果遠(yuǎn)遠(yuǎn)好于不考慮地形的反演效果。以及驗(yàn)證了反演的精度,用來進(jìn)一步判定場源的信息。最后將研究成果應(yīng)用在某礦區(qū)重力異常的反演成像中,根據(jù)反演質(zhì)量成像結(jié)果大致圈定出與鉻鐵礦有關(guān)的超基性巖體,為尋找鉻鐵礦提供了有利靶區(qū)。證明了該研究成果具有比較好的理論意義及實(shí)際應(yīng)用價(jià)值。
[Abstract]:The ultimate goal of geophysical exploration is to obtain the spatial position, size, shape and physical parameters of the source body of the underground field causing the anomaly according to the information (anomaly) of the geophysical field obtained. This work is called geophysical inversion.At present, there are many kinds of inversion methods, but there are many solutions in all inversion calculations. In order to overcome or reduce the multi-solvability of inversion, this is a long-term discussion and research topic for geophysics workers.In this paper, the equivalent source two-dimensional plate model is used to inverse the two-dimensional gravity potential field, to obtain the mass and image, to obtain the distribution of the source body of the underground field causing the gravity anomaly, as well as to determine its spatial position, shape, physical parameters and so on.The forward model in two-dimensional inversion used the horizontal cylinder model, but the fitting of the horizontal cylinder for any section shape is much lower than that of the two-dimensional plate.On the basis of in-depth study of gravity exploration, inversion theory, equivalent source method theory and technology, the inversion imaging program with 2-D plate as the model is compiled, and the vertical plate is used respectively.In the inversion, the design and arrangement of equivalent source are studied in single-layer and multi-layer.The result of inversion imaging of single-layer equivalent source can separate the horizontal superimposed geological bodies and determine the occurrence of geological bodies, and the multi-layer can determine the spatial position, shape and physical properties of geological bodies.At the same time, the inversion imaging with terrain is studied, and its effect is much better than that without considering terrain.The accuracy of the inversion is verified to further determine the information of the field source.Finally, the research results are applied to the inversion imaging of gravity anomalies in a mining area. According to the inversion quality imaging results, the ultrabasic rock bodies related to chromite are roughly delineated, which provides a favorable target for finding chromite.It is proved that the research results have good theoretical significance and practical application value.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P631.1

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