本文選題：三維反演 + 推覆構造��； 參考：《長江大學》2015年碩士論文

【摘要】：由于鎮(zhèn)巴地區(qū)地形起伏大,山坡陡峻屬中高山區(qū),施工十分困難,導致地震地質資料不完善難以確定構造模式,而電法勘探具有儀器輕便,施工容易成本低的優(yōu)點,故此次利用以電法勘探為主,結合重力、磁力、地震資料對工區(qū)進行地層特征,構造模式,生儲蓋組合以及儲層油藏特征描述的地質綜合解釋。對于重力資料的處理利用統(tǒng)一公式進行4項改正：正常場改正、地形校正、中間層校正以及高程項校正。其中中間層和地形改正中的地殼密度用變密度法。而重力資料的反演,正演直接用三重積分法,反演采用遺傳算法。對于磁力資料的處理：進行了正常場改正和日變改正兩項校正。而磁法三維約束反演是三維線性矢量的問題。正演直接用三重積分法,反演采用模擬退火法。其中剩余磁化強度大小和方向要由實驗室磁性測定獲得。測井和地震資料主要用于對特定的地層進行界面限定。對于電法資料的處理是本文的重點,資料的處理涉及三維靜校正和三維地形模擬；靜位移校正技術：采用張量阻抗分解法；地形處理方法是融入帶地形的反演中。由于本測區(qū)為三維構造發(fā)育地區(qū),無疑進行三維反演是最為科學合理的。正演算法為基于張量格林函數(shù)的體積分方程法,反演則用降維逼近反演法,反演過程將地形因素融入其中。降維逼近法的反演原理是對初始模型進行3D正演,結合實測的視電阻率獲取類一維視電阻率,再對類一維視電阻率作一維形式化反演,形成新的模型,繼續(xù)進行下一輪迭代。綜合地質、地震、重磁和電法資料,著重分析各個電性異常的平面特征。深入研究沖斷帶結構關系、斷裂發(fā)育狀況及其展布特征,對鎮(zhèn)巴地區(qū)構造進行了平面的解釋。劃分出了五大物性層,解譯出六條斷裂。劃分出三個一級構造單元,即北大巴山推覆構造帶、米倉山—南大巴山沖斷構造帶、四川盆地；劃分出五個二級構造單元,即紫陽推覆體、鎮(zhèn)坪推覆體、高灘推覆體、大巴山南緣沖斷帶、南大巴斷褶帶。綜合解釋圈定研究區(qū)域局部構造四個,根據電阻率特征,對構造進行評價確定兩個最有利構造。
[Abstract]:Due to the large topography and steep hillsides in Zhenba area, which is very difficult to construct, it is difficult to determine the structural model because of the imperfection of seismic and geological data, and the electric exploration has the advantages of portable instruments and low construction cost. Therefore, the geological comprehensive interpretation of stratigraphic characteristics, structural model, source, reservoir and cap assemblage and reservoir characteristics description of the working area is carried out by using electrical exploration, combined with gravity, magnetic force and seismic data. For gravity data processing, four corrections are made by using the unified formula: normal field correction, topographic correction, intermediate layer correction and elevation correction. The crustal density in the intermediate layer and topographic correction is determined by variable density method. The forward inversion of gravity data is based on the triple integration method and the genetic algorithm is used in the inversion. For the processing of magnetic data, two corrections, normal field correction and diurnal correction, are carried out. The three-dimensional constrained inversion by magnetic method is a problem of three-dimensional linear vector. The forward modeling is directly based on the triple integration method, and the simulated annealing method is used for the inversion. The magnitude and direction of residual magnetization should be obtained by laboratory magnetic measurement. Logging and seismic data are mainly used to define the interface of a particular formation. The processing of electrical data is the focus of this paper, the data processing involves three-dimensional static correction and three-dimensional terrain simulation; static displacement correction technology: using Zhang Liang impedance decomposition method; terrain processing method is integrated into the inversion of terrain. Since this area is a three-dimensional tectonic area, it is undoubtedly the most scientific and reasonable to carry out three-dimensional inversion. The forward algorithm is a volume fractional equation method based on Zhang Liang Green's function, and the inversion is based on the reduced dimension approximation inversion method, in which topographic factors are incorporated into the inversion process. The inversion principle of the reduced-dimension approximation method is to carry out 3D forward modeling of the initial model, combining with the measured apparent resistivity to obtain one-dimensional apparent resistivity, and then to make one-dimensional formal inversion of the quasi-one-dimensional apparent resistivity, to form a new model, and to continue the next iteration. Based on geological, seismic, gravity, magnetic and electrical data, the plane characteristics of various electrical anomalies are analyzed. In this paper, the structural relationship, fault development and distribution characteristics of thrust zone are studied, and the structure of Zhenba area is explained in plane. Five physical layers were divided and six faults were interpreted. It is divided into three primary tectonic units, namely, the North Dabashan nappe belt, the Micangshan-South Dabashan thrust tectonic belt, the Sichuan basin, and the five secondary tectonic units, namely, the Ziyang nappe, the Zhenping nappe, the Gaotan nappe, The southern margin of Daba Mountain thrust belt, South Daba fault fold belt. There are four local structures in the area studied by comprehensive interpretation and delineation. According to the characteristics of resistivity, the two most favorable structures are determined by evaluating the structures.
【學位授予單位】：長江大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P631;P618.13

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