本文選題：多源重力數(shù)據(jù)融合 + 巖石圈密度建模��； 參考：《中國石油大學(xué)(華東)》2014年博士論文

【摘要】：研究巖石圈密度結(jié)構(gòu)對于地球動力學(xué)、大地構(gòu)造分區(qū)、構(gòu)造演化、大尺度重力場等研究有著重要作用,而重力場反演是獲取巖石圈密度結(jié)構(gòu)較為有效的方法之一。因此,本文以基于重力場構(gòu)建巖石圈密度模型為目標(biāo)開展了系列研究。利用多星多周期衛(wèi)星測高數(shù)據(jù),采用垂線偏差法反演了南海海域重力異常。搜集整理了南海多航次的船測重力數(shù)據(jù),并進(jìn)行了測網(wǎng)平差。設(shè)計(jì)了基于小波分析的多源重力數(shù)據(jù)融合方案,制定了各頻率系數(shù)的融合規(guī)則,探討了不同小波函數(shù)和分解層數(shù)對融合結(jié)果的影響。在中國南海的應(yīng)用結(jié)果表明,基于小波分析的多源重力數(shù)據(jù)融合方法是一種運(yùn)算速度快、融合效果好的多源重力數(shù)據(jù)融合的新方法。設(shè)計(jì)了為巖石圈密度建模與交互式重力場反演服務(wù)的一類角點(diǎn)網(wǎng)格模型來表征三維地質(zhì)體。重力場交互式反演的方法與流程為:基于三維模型生成多條二維剖面、并行地在頻率域正演剖面上方觀測點(diǎn)的重力異常場;設(shè)計(jì)實(shí)現(xiàn)剖面編輯方法,以多條剖面的編輯、重力場擬合結(jié)果為約束,修正初始三維模型�；谌S模型正演重力場提高了計(jì)算場的可靠性,通過二維剖面間接地與三維模型進(jìn)行交互,提高了操作的便捷性。研究了沉積層埋深-孔隙度-密度之間的關(guān)系,巖石圈地幔內(nèi)溫壓場的計(jì)算方法以及巖石圈地幔密度場與溫壓場之間的關(guān)系。以基底厚度的反演為主線,設(shè)計(jì)了一個(gè)重力場反演流程,基于該流程可以一并地優(yōu)選出構(gòu)建沉積層、巖石圈地幔密度場所需的參數(shù)值以及基底密度與莫霍面深度。搜集了南海及鄰域內(nèi)的水深、地形、沉積層厚度以及多條深地震剖面解釋成果等數(shù)據(jù)。依據(jù)密度建模與重力場反演的方法流程,以地震解釋成果數(shù)據(jù)為約束優(yōu)選出了適用于南海沉積層、巖石圈地幔密度建模的參數(shù)值,并反演出了基底密度與莫霍面深度。利用本文開發(fā)的軟件系統(tǒng),依據(jù)各個(gè)圈層的界面深度、密度結(jié)構(gòu),構(gòu)建了南海及鄰域內(nèi)巖石圈的三維密度模型,并通過交互式反演逐步修正并完善了該密度模型。利用南海及鄰域巖石圈密度模型中的基底厚度數(shù)據(jù),根據(jù)南海形成演化史,在考慮陸殼基底形變的基礎(chǔ)上,定量化地恢復(fù)出了南海對偶陸緣的初始形態(tài);計(jì)算了將南�，F(xiàn)今南部陸緣移動到晚白堊紀(jì)位置所需的歐拉旋轉(zhuǎn)極,并構(gòu)建了全吻合式的板塊重建模型。根據(jù)計(jì)算出的全地殼拉伸因子、塊重建模型,分析和討論了南海及鄰域內(nèi)各地塊、海盆、大型沉積盆地等的形成與演化歷程。
[Abstract]:The study of lithospheric density structure plays an important role in geodynamics, tectonic zoning, tectonic evolution, large-scale gravity field, and inversion of gravity field is one of the more effective methods to obtain lithospheric density structure. Therefore, a series of studies have been carried out to construct lithospheric density model based on gravity field. The gravity anomalies in the South China Sea are inversed by using the multi-satellite and multi-period satellite altimetry data and the vertical deviation method. The gravity data of multiple voyages in the South China Sea are collected and adjusted. A multi-source gravity data fusion scheme based on wavelet analysis is designed, and the fusion rules of each frequency coefficient are worked out, and the influence of different wavelet functions and decomposition layers on the fusion results is discussed. The application results in the South China Sea show that the multi-source gravity data fusion method based on wavelet analysis is a new method for multi-source gravity data fusion with fast computation speed and good fusion effect. A class of corner grid models for lithospheric density modeling and interactive gravity field inversion are designed to represent 3D geological bodies. The method and flow of interactive inversion of gravity field are as follows: generate multiple 2D profiles based on 3D model, parallel gravity anomaly field of observation points above the forward section in frequency domain, design and implement the method of section editing, edit multiple sections, The fitting result of gravity field is constrained and the initial 3D model is modified. Based on the forward gravity field of 3D model, the reliability of calculation field is improved, and the convenience of operation is improved by indirectly interacting with 3D model through two-dimensional section. The relationship between buried depth, porosity and density of the sedimentary layer, the calculation method of the temperature and pressure field in the lithospheric mantle and the relationship between the density field of the lithospheric mantle and the temperature and pressure field are studied. Taking the inversion of basement thickness as the main line, a gravity field inversion process is designed. Based on this process, the parameters required for constructing sedimentary layer, lithospheric mantle density location and the depth between basement density and Moho surface can be selected together. The data of water depth, topography, sediment thickness and interpretation results of several deep seismic profiles in the South China Sea and its adjacent areas are collected. According to the method flow of density modeling and gravity field inversion, the parameter values suitable for the density modeling of sedimentary layer and lithospheric mantle in the South China Sea are selected with seismic interpretation data as constraints, and the basement density and Moho surface depth are inversed. Using the software system developed in this paper, according to the interface depth and density structure of each layer, the three-dimensional density model of the lithosphere in the South China Sea and its adjacent area is constructed, and the density model is revised and perfected step by interactive inversion. Based on the basement thickness data of the South China Sea and its adjacent lithosphere density model and the evolution history of the South China Sea, the initial morphology of the dual continental margin of the South China Sea is quantitatively restored on the basis of the continental crust basement deformation. The Euler rotation poles needed to move the present southern margin of the South China Sea to the late Cretaceous position are calculated and a fully consistent plate reconstruction model is constructed. Based on the calculated total crustal extension factor and block reconstruction model, the formation and evolution of various blocks, basins and large sedimentary basins in the South China Sea and its adjacent areas are analyzed and discussed.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：P736

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本文編號：1912986