本文選題：井震約束　切入點(diǎn)：大地電磁　出處：《中國(guó)地質(zhì)大學(xué)》2017年博士論文

【摘要】：研究一種基于測(cè)井、地震及地質(zhì)資料約束下,二維、三維大地電磁與重力數(shù)據(jù)的非線性聯(lián)合反演新方法。通過(guò)約束和聯(lián)合反演,降低處理解釋多解性,提高綜合地球物理資料對(duì)研究目標(biāo)的分辨率,具有重要的理論意義和實(shí)用價(jià)值。本文圍繞基于井震約束的大地電磁與重力的非線性聯(lián)合反演方法,開展了以下幾方面的研究:1.開發(fā)了一種新的二維和三維多屬性、多參數(shù)、實(shí)時(shí)、人機(jī)交互的建模軟件�；诳缙脚_(tái)的Qt4開發(fā)環(huán)境,開發(fā)了快速準(zhǔn)確的二維和三維電磁-重力聯(lián)合建模程序,為重磁電約束聯(lián)合正反演提供了有力支撐。提出并實(shí)現(xiàn)了兩次插值法,即對(duì)剖分網(wǎng)格幾何特征和屬性值分別采用不同的插值方法,保證了地層內(nèi)部屬性不變而地質(zhì)界線變化的地質(zhì)規(guī)律。提出遞進(jìn)建模方法,先二維再三維,不需考慮復(fù)雜的三維空間曲面切割、拓?fù)涠嗝骟w構(gòu)建技術(shù),方法技術(shù)簡(jiǎn)單可靠、結(jié)果正確,能夠滿足三維快速建模的需要。2.開發(fā)了二維、三維大地電磁與重力的并行正演模擬軟件�；贛PI編程環(huán)境,完成了二維和三維的大地電磁和重力正演并行算法研究和開發(fā)。通過(guò)對(duì)頻率的并行,二維有限差分正演的計(jì)算速度比串行的有限元方法快幾十到上百倍,而精度相當(dāng);三維大地電磁有限差分正演結(jié)果與三維積分方程的相對(duì)誤差小于2.2%;二維、三維大地電磁并行正演計(jì)算速度與參與并行的CPU個(gè)數(shù)基本成線性相關(guān);實(shí)現(xiàn)了二維和三維重力正演對(duì)測(cè)點(diǎn)的并行計(jì)算,提高了計(jì)算速度。3.提出并實(shí)現(xiàn)了基于井震約束的二維和三維大地電磁與重力的人工魚群并行聯(lián)合反演。提出基于地層的電阻率與密度存在的物性關(guān)系建立聯(lián)合約束條件。引入人工魚群的群智能算法,并應(yīng)用到二維和三維、大地電磁和重力的獨(dú)立和聯(lián)合反演中,采用多種模型測(cè)試了獨(dú)立與聯(lián)合反演方法的可行性和正確性。聯(lián)合反演的電阻率值和密度值收斂精度明顯高于單方法獨(dú)立反演的結(jié)果,有效地提高反演精度。4.成功應(yīng)用井震約束的大地電磁與重力人工魚群并行聯(lián)合反演技術(shù)發(fā)現(xiàn)了川中深層裂谷及南華紀(jì)有利目標(biāo)。首次采用分層統(tǒng)計(jì)方法建立了研究區(qū)電阻率與密度的聯(lián)合反演約束關(guān)系式;采用該方法對(duì)研究區(qū)的測(cè)線進(jìn)行了井震約束下的二維大地電磁-重力的聯(lián)合反演,提高了川中深層目標(biāo)的精度,搞清了研究區(qū)的南華紀(jì)地層分布,指出有利油氣聚集帶,該推測(cè)解釋結(jié)果得到了后期兩口鉆井的驗(yàn)證。
[Abstract]:A new nonlinear joint inversion method based on logging, seismic and geological data, two-dimensional and three-dimensional magnetotelluric and gravity data is studied. It is of great theoretical significance and practical value to improve the resolution of synthetic geophysical data. This paper focuses on the nonlinear joint inversion method of magnetotelluric and gravity based on well earthquake constraint. A new two-dimensional and three-dimensional multi-attribute, multi-parameter, real-time, human-computer interaction modeling software is developed. Based on a cross-platform Qt4 development environment, A fast and accurate 2D and 3D electromagnetic gravity joint modeling program is developed, which provides a powerful support for gravity magnetoelectric constraint joint forward and inverse modeling. A quadratic interpolation method is proposed and realized. That is to say, different interpolation methods are used for the geometric characteristics and attribute values of the meshes to ensure the geological law of the change of the geological boundary while the attributes of the strata are not changed. A progressive modeling method is proposed, which consists of two dimensions and three dimensions. The technology of constructing topological polyhedron is simple and reliable, and the result is correct, which can meet the needs of 3D fast modeling. 3D magnetotelluric and gravity parallel forward modeling software. Based on MPI programming environment, the research and development of 2D and 3D magnetotelluric and gravity forward modeling parallel algorithms are completed. The forward modeling speed of two-dimensional finite difference is tens to hundreds of times faster than that of serial finite element method, and the accuracy is the same; the relative error between three-dimensional magnetotelluric finite difference forward modeling and three-dimensional integral equation is less than 2.2; two-dimensional magnetotelluric finite-difference forward modeling is less than 2.2. The speed of 3D magnetotelluric parallel forward modeling is linearly related to the number of parallel CPU, and the parallel calculation of 2D and 3D gravity forward modeling is realized. The parallel joint inversion of two and three dimensional magnetotelluric and gravity artificial fish swarm based on well earthquake constraint is proposed and realized. A joint reduction based on the physical relationship between resistivity and density is proposed. Introduction of artificial fish swarm intelligence algorithm, And applied to two-dimensional and three-dimensional, magnetotelluric and gravity independent and joint inversion, Several models are used to test the feasibility and correctness of the independent and joint inversion methods. The convergence accuracy of the resistivity and density values of the joint inversion is obviously higher than that of the single independent inversion. The inversion accuracy is improved effectively .4.The parallel joint inversion technique of magnetotelluric and gravity artificial fish swarm constrained by well earthquakes has been successfully used to find the favorable targets of deep rift and Nanhua epoch in central Sichuan. The stratified statistical method has been established for the first time. The joint inversion constraint relation between resistivity and density; By using this method, the joint inversion of 2D magnetotelluric gravity under well earthquake constraints is carried out on the survey lines in the study area, which improves the precision of the deep target in the middle of Sichuan, makes clear the distribution of the South China formation in the study area, and points out the favorable oil-gas accumulation zone. The result of the conjecture interpretation was verified by two later drilling wells.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：P631

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