本文選題：孔南地區(qū) + 中古生界��； 參考：《長(zhǎng)江大學(xué)》2015年碩士論文

【摘要】：本文充分利用三維地震資料,結(jié)合鉆井、測(cè)井解釋成果,以構(gòu)造幾何學(xué)、地球運(yùn)動(dòng)學(xué)、動(dòng)力學(xué)等理論觀點(diǎn)為指導(dǎo),運(yùn)用平衡剖面技術(shù)恢復(fù)研究區(qū)構(gòu)造演化過程,系統(tǒng)詳細(xì)解析孔南地區(qū)中、古生界逆沖推覆帶結(jié)構(gòu)、斷裂構(gòu)造特征、各段典型構(gòu)造樣式及其構(gòu)造演化與形成機(jī)制。在中古生界疊置盆地的構(gòu)造解析研究中,在過井剖面及網(wǎng)格狀地震-地質(zhì)大剖面的綜合解釋的基礎(chǔ)上,精細(xì)解釋分析主要構(gòu)造界面以及不同深度構(gòu)造圖,揭示了中、古生界疊置盆地構(gòu)造性質(zhì)、類型、樣式的主要特征,共劃分出擠壓作用、伸展作用、剪切作用、反轉(zhuǎn)作用相關(guān)的四種構(gòu)造類型和十三種基本的構(gòu)造樣式；總結(jié)了中古生界逆沖推覆帶各段五種典型構(gòu)造樣式；明確了推覆帶與烏馬營(yíng)背斜、王官屯潛山等構(gòu)造之問的相互關(guān)系。具體而言,推覆帶可分為四段,南段以逆掩推覆為主,中南段以仰沖后展式斷展推覆為主,中北段以仰沖前展式斷展推覆為主,北段以逆沖推覆與疊瓦背沖交替為主。工區(qū)印支期總體構(gòu)造特征為寬緩背向斜,燕山期具深層疊瓦沖斷厚皮構(gòu)造與淺層滑脫推覆薄皮構(gòu)造縱向雙層變形結(jié)構(gòu)。中古生界具下古生界由南向北高角度遠(yuǎn)間距疊瓦逆沖拆離夾持背向斜特征,為基底卷入型構(gòu)造；上古生界-中生界自北西西向南東方向逆沖推覆,形成蓋層滑脫型構(gòu)造�；撁鏋槭肯得合档貙优c中奧陶統(tǒng)底部下馬家溝組泥頁巖層段。新生界構(gòu)造負(fù)反轉(zhuǎn)滑覆斷裂與左旋剪切張扭構(gòu)造對(duì)中古生界擠壓構(gòu)造具有改造作用。在對(duì)工區(qū)構(gòu)造形成期次和主要構(gòu)造形成機(jī)制的探討研究中,取得以下幾點(diǎn)認(rèn)識(shí)：(1)本論文首次提出轉(zhuǎn)換帶之間,還存在四組北西向展布的張扭剪切帶,表現(xiàn)為喜馬拉雅早期左旋扭動(dòng)性質(zhì),與郯廬斷層右行走滑有關(guān)。(2)工區(qū)中古生界可概括為五大構(gòu)造演化期次,分別為穩(wěn)定地臺(tái)期、寬緩背向斜產(chǎn)生期、蓋層滑脫推覆期、張扭剪切改造期、斷陷-拗陷沉降改造期。其中烏馬營(yíng)背斜、王官屯背斜主要形成于印支期,為板緣造山板內(nèi)遞進(jìn)輕微變形結(jié)果,燕山期-喜山期構(gòu)造運(yùn)動(dòng)對(duì)背斜構(gòu)造進(jìn)行了改造：徐黑潛山、王官屯潛山印支期為背斜一部分,喜山期構(gòu)造負(fù)反轉(zhuǎn)斷裂切割為斷塊潛山。(3)上古生界-中生界逆沖推覆帶主要產(chǎn)生于燕山陸內(nèi)造山期,逆沖推覆帶各段典型構(gòu)造樣式分布特征與逆沖推覆體發(fā)育所處特定構(gòu)造部位相關(guān)。(4)研究區(qū)古背斜與推覆體上發(fā)育的前新生界重要角度不整合面為印支、燕山兩期多幕剝蝕削截的結(jié)果。上、下正負(fù)向盆地構(gòu)造以不整合面為界表現(xiàn)為鏡像對(duì)應(yīng)疊置關(guān)系。
[Abstract]:In this paper, we make full use of 3D seismic data, combined with drilling and logging interpretation results, based on structural geometry, geo-kinematics, dynamics and other theoretical points of view, using balanced section technology to restore the tectonic evolution process in the studied area. The structure of Paleozoic thrust-nappe belt, the characteristics of fault structure, the typical structural styles of each segment and their tectonic evolution and formation mechanism in Gongnan area are systematically analyzed in detail. In the structural analysis of the Middle Paleozoic superimposed basins, on the basis of the comprehensive interpretation of the cross well section and the grid seismo-geological section, the main structural interfaces and the structural maps of different depths are analyzed in detail. The main characteristics of the Paleozoic superimposed basins are the characteristics of tectonic properties, types and styles, which are divided into four tectonic types related to compressional, extensional, shearing and inversion processes and thirteen basic structural styles. Five typical structural styles of the Middle Paleozoic thrust nappe belt are summarized, and the interrelation between the nappe belt and the structures of the Wumaying anticline and the buried hill of Wangguantun are clarified. Specifically, the nappe belt can be divided into four sections, the south segment is mainly overthrust, the central and southern segment is dominated by the upside-thrust extended fault extension nappe, the central northern segment is dominated by the upper-thrust forward extension fault extension nappe, and the northern segment is dominated by the replacement of thrust nappe and brush-back thrust. The general structural characteristics of the Indosinian period in the working area are wide and slow anticlinal, and the Yanshanian period is characterized by deep imbricate thrusting thick crust structure and shallow slippage nappe structure with longitudinal double layer deformation structure. The Middle Paleozoic has the characteristics of the lower Paleozoic from the south to the north, and the upper Paleozoic and Mesozoic are thrust and nappe from NW to E, forming the tectonics of caprock detachment. The detachment surface is the Carboniferous coal series strata and the lower Majiagou formation shale formation at the bottom of the Middle Ordovician. The negative reverse slip fault and the left lateral shear tensional structure of the Cenozoic structure have the function of reforming the Middle Paleozoic compressional structure. In the study of the tectonic formation stages and the main tectonic formation mechanisms in the working area, the following points have been obtained: (1) in this paper, it is the first time that there are four groups of tensional shear belts distributed in the NW direction between the transition zones. The middle Paleozoic in the Tan-Lu fault right strike-slip area can be summed up as five tectonic evolution stages, namely, stable platform stage, wide and slow anticline generation period, caprock detachment and nappe stage, respectively, in the early Himalayan period, which is related to the right strike-slip of the Tanlu fault. The stage of shearing transformation of tensioning and torsion, the period of subsidence reformation of fault depression and depression. Among them, Wumaying anticline and Wangguantun anticline mainly formed in the Indosinian period, resulting in slight deformation in the plate margin orogenic plate. The tectonic movement of Yanshanian to Himalayan epoch reformed the anticline structure: Xu Kuroc buried hill, The Indosinian epoch of Wangguantun buried hill is part of the anticline, and the negative inversion fault of the Himalayan period is cut into the buried hill of fault block. 3) the Upper Paleozoic Mesozoic thrust nappe mainly occurred during the Yanshanian intracontinental orogenic period. The distribution characteristics of typical tectonic styles in each segment of the thrust nappe belt are related to the specific tectonic position in which the thrust nappe develops.) the important angle unconformity surface of the Paleo-anticline and nappe developed on the paleo-anticline and nappe is the Indosinian. The results of two episodes of multi-act denudation in Yanshan. In the upper and lower positive and negative basins, the boundary of the unconformities is mirrored and superimposed.
【學(xué)位授予單位】：長(zhǎng)江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P548

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