本文選題：齊古背斜　切入點(diǎn)：準(zhǔn)噶爾盆地南緣　出處：《西南石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：齊古背斜隸屬于準(zhǔn)噶爾盆地南緣山前褶皺沖斷帶,是受燕山期和喜山期造山活動(dòng)作用的結(jié)果。齊古背斜構(gòu)造變形強(qiáng)烈,深淺構(gòu)造相互疊加,構(gòu)造演化序列難以確定,與相鄰背斜間的構(gòu)造轉(zhuǎn)換關(guān)系不甚清楚。準(zhǔn)噶爾盆地南緣油氣顯示豐富,長(zhǎng)久以來(lái)一直受到石油地質(zhì)工作者的重視。近幾年來(lái),隨著對(duì)準(zhǔn)南褶皺沖斷帶石油勘探的深入,特別是在瑪河油田獲得重要的油氣勘探突破,南緣山前褶皺沖斷帶的構(gòu)造研究被擺在了油氣勘探的首要位置。 本文在總結(jié)前人的研究基礎(chǔ)上,運(yùn)用現(xiàn)代構(gòu)造地質(zhì)學(xué)的理論,通過(guò)斷層相關(guān)褶皺幾何學(xué)分析方法,配合平衡地質(zhì)剖面技術(shù),以地表露頭和實(shí)測(cè)資料為約束條件,對(duì)過(guò)齊古背斜的地震剖面進(jìn)行了構(gòu)造幾何建模,確定了齊古背斜的合理變形樣式；在此基礎(chǔ)上完成了地震剖面的構(gòu)造精細(xì)解釋,厘清了主要構(gòu)造變形時(shí)期斷裂體系的分布與構(gòu)造繼承關(guān)系,最終構(gòu)建出齊古背斜的三維構(gòu)造地質(zhì)數(shù)字模型。 研究表明齊古背斜在燕山期開(kāi)始出現(xiàn)向盆地的逆沖推覆與造山過(guò)程,導(dǎo)致山前侏羅系-白堊系、白堊系內(nèi)部廣泛發(fā)育構(gòu)造不整合界面；齊古背斜的形成受到深淺多個(gè)斷裂體系的共同作用,可劃分出三個(gè)主要的斷裂體系：深部的隱伏斷層轉(zhuǎn)折褶皺,中淺層的雙重構(gòu)造(齊古北斷塊),以及齊古北高角度的逆沖斷層傳播褶皺；齊古背斜東段至昌吉背斜西側(cè),低角度逆沖推覆逐漸消失(至吐谷魯?shù)哪鏇_斷層),背斜變形主要由高角度逆沖斷層所致；齊古背斜核部由兩套具有構(gòu)造派生和繼承關(guān)系的次級(jí)斷裂體系構(gòu)成,均發(fā)育于侏羅系內(nèi)部,未對(duì)背斜上部地層造成破壞,組成一較為完整的背斜圈閉,具良好的油氣勘探潛力。
[Abstract]:The Qigu anticline belongs to the Foreland fold thrust belt in the southern margin of Junggar Basin and is the result of orogenic activity in Yanshanian and Himalayan periods. The tectonic deformation of Qigu anticline is strong, the deep and shallow structures superimpose each other, and the tectonic evolution sequence is difficult to determine. The relationship between tectonic transformation and adjacent anticlines is not very clear. The southern margin of Junggar basin is rich in oil and gas, and has been attached great importance by petroleum geologists for a long time. In recent years, with the development of petroleum exploration in the south fold thrust belt, Especially in Mahe Oilfield, important oil and gas exploration breakthrough has been made, and the structural study of the Foreland fold thrust belt in the southern margin has been placed in the primary position of oil and gas exploration. On the basis of summarizing the previous studies, this paper applies the theory of modern tectonic geology, through the method of fault related fold geometry analysis, and with the balanced geological section technique, taking the outcrop and the measured data as the constraint conditions. In this paper, the structural geometry model of seismic section passing through Qi ancient anticline is carried out, and the reasonable deformation style of Qi ancient anticline is determined, and on this basis, the structure fine interpretation of seismic section is completed. The relationship between the distribution of fault system and tectonic inheritance during the main tectonic deformation period is clarified, and finally a three-dimensional tectonic geological digital model of Qi-paleo-anticline is constructed. The study shows that the Qi-paleo-anticline began to appear in the Yanshanian period, and the thrust nappe and orogenic process appeared in the basin, leading to the Foreland Jurassic-Cretaceous system, and the tectonic unconformity interface was widely developed in the Cretaceous. The formation of Qigu anticline is affected by many fault systems, which can be divided into three main fault systems: the deep concealed fault turning fold, Double tectonics in the middle and shallow layers (Qigubei fault block and thrust fault propagation fold at high angle in Qigubei, the eastern segment of Qigu anticline to the west of Changji anticline, The low-angle thrust nappe gradually disappeared (the thrust fault to Tukulu, the anticline deformation was mainly caused by the high-angle thrust fault, and the core part of the Qipaleo-anticline was composed of two sets of secondary fault systems with tectonic derivation and inheritance relationship. They all developed in the Jurassic system, did not damage the upper strata of the anticline, and formed a relatively complete anticline trap, which has good oil and gas exploration potential.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13

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