本文選題：渝東北 + 保存條件��； 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：該論文以渝東北下古生界下寒武統(tǒng)水井沱組和上奧陶統(tǒng)五峰組—下志留統(tǒng)龍馬溪組頁巖為對象分析頁巖氣構(gòu)造保存條件,這對渝東北頁巖氣的勘探前景具有參考價值。 通過文獻調(diào)研認為重慶經(jīng)歷的構(gòu)造沉積演化有揚子準地臺褶皺基底生成階段、槽臺分野階段和陸內(nèi)改造階段。渝東北地區(qū)的沉積巖,除泥盆系、石炭系和古、新近系缺失外,從新元古界明月組到第四系地層都有出露。 以城口斷裂作為界線將大巴山弧形構(gòu)造帶進行構(gòu)造單元的劃分：北大巴逆沖推覆構(gòu)造帶和南大巴復(fù)合前陸褶皺—沖斷帶。根據(jù)運動學(xué)特征及變形特征、斷層和褶皺的組合類型及其發(fā)育程度,對其進行次級構(gòu)造單元的劃分。 渝東北城口斷裂以北區(qū)域的主要構(gòu)造樣式特征是褶皺和斷層顯著發(fā)育,形成半花狀構(gòu)造,發(fā)育一系列縱斷裂,往北西向延伸并兩端被城口斷裂截切。以野外地表進行地質(zhì)調(diào)查作為基礎(chǔ),運用Lowell和Harding構(gòu)造樣式分類方案,渝東北城口斷裂以南區(qū)域中的主要構(gòu)造樣式是“蓋層滑脫型”中的“逆沖褶皺組合”,其發(fā)育3類構(gòu)造組合：逆沖斷層系統(tǒng)、沖斷褶皺系統(tǒng)和滑脫褶皺系統(tǒng),從橫向上看分別是以坪壩斷裂、雞鳴寺斷裂為界線的疊瓦沖斷帶、沖斷褶皺帶、滑脫褶皺帶構(gòu)造單元的典型構(gòu)造組合,從縱向上看也分別是以三疊系膏鹽巖層、志留系泥巖為界線的下構(gòu)造層、中構(gòu)造層、上構(gòu)造層的典型構(gòu)造組合。疊瓦沖斷帶以斷裂為主,褶皺少見,常見疊瓦狀逆沖斷層、反沖斷層、沖起構(gòu)造、構(gòu)造三角帶和雙重構(gòu)造等。沖斷褶皺帶斷裂和褶皺發(fā)育程度大致對等,常見斷層相關(guān)褶皺�；擇薨檸е饕l(fā)育滑脫褶皺,見少量逆沖斷層,該區(qū)一個最主要的特點就是見典型的穹隆構(gòu)造。通過野外的勘察、對巖心和鏡下薄片的觀察,見裂縫較發(fā)育,裂縫對頁巖氣的保存有雙重作用。 通過野外地質(zhì)調(diào)查和測量,水井沱組泥頁巖厚度較大,普遍62m—253m；五峰組—龍馬溪組泥頁巖厚度較大,普遍25m—73m。 根據(jù)對渝東北地區(qū)構(gòu)造特征和下古生界頁巖氣蓋層特征的分析,優(yōu)選渝東北下古生界水井沱組、五峰組—龍馬溪組頁巖氣構(gòu)造保存有利區(qū)。優(yōu)選4個水井沱組頁巖氣構(gòu)造保存有利區(qū),即廟堂鄉(xiāng)一帶、汾河一鴛鴦鄉(xiāng)一帶、蓼子鄉(xiāng)一帶、滿月鄉(xiāng)南側(cè)一帶；五峰組—龍馬溪組頁巖氣構(gòu)造保存有利區(qū)是巫溪咸水鄉(xiāng)—龍臺鄉(xiāng)一帶和奉節(jié)縣界附近,可以作為將來勘探的優(yōu)選區(qū)域。
[Abstract]:The paper takes the lower Cambrian Shui Jing Tuotuo formation and the five peak shales of the lower Ordovician to the Lower Silurian Long Ma Creek formation in the lower Paleozoic in Northeast Chongqing as an object to analyze the preservation conditions of the shale gas structure, which is of reference value for the exploration prospect of shale gas in Northeast Chongqing.
Through literature research, it is believed that the tectonic sedimentary evolution of Chongqing has the stage of the formation of the folds of the Yangzi quasi platform fold, the division stage of the trough platform and the stage of the intracontinental transformation. The sedimentary rocks in Northeast Chongqing, except the Devonian system, the Carboniferous and the ancient and the Neogene, have been exposed from the Ming moon formation in the Neoproterozoic to the Quaternary.
Taking the Chengkou fault as the boundary line, the dababan arc tectonic zone is divided into structural units: the dababa thrust nappe belt and the South Daba complex Foreland Fold and thrust belt. According to the characteristics of the kinematics and deformation, the types and development of the faults and folds, the subdivision of the secondary tectonic units is carried out.
The main structural styles in the north area of the Chengkou fault in Northeast Chongqing are characterized by folds and faults, forming a semi flower structure, developing a series of longitudinal faults, extending to the North West and cutting at the two ends of the city mouth fault. Based on the geological survey of the field surface, the Lowell and Harding structural styles are classified and the northern city of Chongqing is broken. The main structural style in the southern part of the split is the "thrust fold combination" in "cover slide type", which develops 3 types of structural combinations: thrust fault system, thrust fold system and slip fold system. From the lateral view, the thrust fold belt, thrust fold belt, and slip fold belt, respectively, are divided into Pingba fault and Jiming Temple fault line. The typical structural combinations of the unit are also in the longitudinal direction of the Triassic gypsum salt rock layer, the Silurian mudstone as the boundary of the lower tectonic layer, the middle tectonic layer and the upper tectonic layer. The thrust belt is characterized by faults, rare folds, common imbricate thrust faults, backflushing faults, thrust structures, tectonic triangle belts and double structures. The fault and fold development of the thrust fold belt are roughly equivalent, common fault related folds. The slip folds mainly develop slipping folds and a few thrust faults. One of the most important features of this area is the typical dome structure. Through field investigation, the fracture is more developed in the observation of the core and under the microscope sheet, and the fracture is to shale. The preservation of gas has a double effect.
Through field geological survey and measurement, the shale thickness of Shuijing formation is large, generally 62m - 253m; the thickness of shale in the five peak group - the long Ma Xi formation is large, and 25m - 73m. is generally.
According to the structural features of the Northeast Chongqing and the characteristics of the shale gas cover in the lower Paleozoic, the lower Paleozoic Shui Jing Tuo formation, the five peak group and the long Ma Creek formation shale gas structure in the northeast of Chongqing is preferred, and the favorable areas for the preservation of the 4 Shui Jing Tuo formation shale gas structures are preferred, namely, the Temple Township, the Fen River Yuanyang area, the Polygonum Village area, and the full moon township. In the south side, the favorable areas for the preservation of the shale gas structure of the five peak - Longma Creek formation are in the vicinity of the Wuxi salty water Township Longtai Township and Fengjie County, which can be used as the preferred area for future exploration.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13

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