本文選題：重磁勘探 + 三維　； 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：重磁物性模型構(gòu)建中,因?yàn)椴簧婕皥?chǎng)源復(fù)雜的形態(tài)變化,并且更容易結(jié)合地質(zhì)等先驗(yàn)信息和約束條件,因此物性反演已成為重磁反演發(fā)展的趨勢(shì)。而反演技術(shù)的關(guān)鍵是充分利用約束條件盡量避免多解性。所以,本文深入研究了重磁三維約束反演,對(duì)比了不同模型下約束反演的理論效果,并通過(guò)處理實(shí)際資料驗(yàn)證了約束反演良好效果。首先,在研究了重磁異�；纠碚摰幕A(chǔ)上,重點(diǎn)研究了重磁異常點(diǎn)源法計(jì)算方法,得到了點(diǎn)源法的重磁異常正演離散公式,并編制Fortran程序?qū)崿F(xiàn)了模型的重磁異常正演計(jì)算。其次,在熟悉反演基本理論的基礎(chǔ)上重點(diǎn)研究了英屬哥倫比亞大學(xué)的Li和Oldenburg提出了重磁三維光滑約束反演。構(gòu)建的目標(biāo)函數(shù)既包含了數(shù)據(jù)擬合函數(shù),又包含了模型函數(shù),其中的正則化因子,用來(lái)控制模型函數(shù)在目標(biāo)函數(shù)中的權(quán)重。并將深度加權(quán)函數(shù)引入到目標(biāo)函數(shù)中,克服了核函數(shù)的自然衰減(即趨膚效應(yīng))。推導(dǎo)了粗糙度函數(shù),并將其引入到模型函數(shù)中,實(shí)現(xiàn)了模型的光滑約束。采用比廣義逆法更好的共軛梯度法求解目標(biāo)函數(shù)的最小化。再次,本文以磁異常反演為例,分別設(shè)計(jì)了一個(gè)直立長(zhǎng)方體模型、兩個(gè)長(zhǎng)方體模型、五個(gè)長(zhǎng)方體模型及傾斜板狀體模型,運(yùn)用了深度加權(quán)約束、模型加權(quán)約束進(jìn)行反演,并對(duì)比分析了有無(wú)深度加權(quán)、有無(wú)模型加權(quán)時(shí)的反演效果,并得出有約束時(shí)恢復(fù)的模型更接近真實(shí)模型。最后,將約束反演方法用于西藏東巧地區(qū)的重磁勘探,取得了較好的效果,驗(yàn)證了方法的有效性。
[Abstract]:In the construction of gravity and magnetic physical properties model, physical inversion has become the trend of gravity and magnetic inversion because it does not involve complex morphological changes of field sources, and it is easier to combine prior information and constraints such as geology. The key of inversion technique is to make full use of constraints to avoid multi-solution. Therefore, in this paper, the gravity and magnetic three-dimensional constrained inversion is deeply studied, and the theoretical results of constrained inversion under different models are compared, and the good results of constrained inversion are verified by processing the actual data. Firstly, on the basis of studying the basic theory of gravity and magnetic anomaly, the calculation method of gravity and magnetic anomaly point source method is studied emphatically, and the forward discrete formula of gravity and magnetic anomaly is obtained, and the Fortran program is compiled to realize the forward calculation of gravity and magnetic anomaly. Secondly, on the basis of the basic theory of inversion, Li and Oldenburg of the University of British Columbia proposed the gravity and magnetic 3D smooth constrained inversion. The constructed objective function includes both the data fitting function and the model function. The regularization factor is used to control the weight of the model function in the objective function. The depth-weighted function is introduced into the objective function to overcome the natural attenuation of the kernel function (i.e. skin effect). The roughness function is derived and introduced into the model function to realize the smooth constraint of the model. The conjugate gradient method, which is better than the generalized inverse method, is used to minimize the objective function. Thirdly, taking the inversion of magnetic anomalies as an example, this paper designs a vertical cuboid model, two cuboid models, five cuboid models and inclined slab model respectively. The inversion results with or without depth weighting and model weighting are compared and analyzed, and it is concluded that the model with constraints is closer to the real model. Finally, the constrained inversion method is applied to gravity and magnetic exploration in Dongqiao area, Tibet, and good results are obtained, and the validity of the method is verified.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P631

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 賀日政;高銳;鄭洪偉;張季生;;青藏高原中西部航磁異常的匹配濾波分析與構(gòu)造意義[J];地球物理學(xué)報(bào);2007年04期

2 姚長(zhǎng)利,郝天珧,管志寧;重磁反演約束條件及三維物性反演技術(shù)策略[J];物探與化探;2002年04期

相關(guān)博士學(xué)位論文 前1條

1 班麗;相關(guān)約束重磁三維定量反演方法研究[D];中國(guó)石油大學(xué);2009年

相關(guān)碩士學(xué)位論文 前1條

1 李青青;基于正則化方法的圖像去噪模型的研究[D];武漢理工大學(xué);2013年

，

本文編號(hào)：2022311