本文關鍵詞： 渝東北 頁巖氣 構造樣式 保存條件 有利區(qū)預測　出處：《西南石油大學》2017年碩士論文　論文類型：學位論文

【摘要】：論文以礦物巖石學、石油地質學、構造地質學等相關學科作為理論依據,結合室內實驗與野外剖面觀察,分析區(qū)域地質背景和區(qū)域構造演化史;通過渝東北地區(qū)的構造樣式、斷裂特征、裂縫特征等,來研究構造特征對頁巖氣富集、保存條件的影響。最后根據頁巖氣構造保存條件預測有利區(qū)塊,為渝東北地區(qū)的頁巖氣勘探提供地質依據。渝東北地區(qū)位于大巴山逆沖推覆帶前緣,橫跨秦嶺地層區(qū)與揚子地層區(qū)。研究區(qū)的地層除泥盆系、第四系缺失外,整體都有出露。城巴斷裂將渝東北地區(qū)分隔為北大巴山逆沖推覆構造帶和南大巴山前陸褶皺沖斷帶兩個一級構造單元。其中南大巴山前陸褶皺沖斷帶沿坪壩斷裂和雞鳴寺斷裂劃分為疊瓦斷層帶、斷層-褶皺帶和滑脫褶皺帶三個次級構造單元。北大巴山推覆構造帶整體為復式背斜,斷層的顯著發(fā)育表明該區(qū)經歷強烈的沖斷作用。南大巴山斷褶帶的構造樣式是“逆沖褶皺組合”,形成逆沖斷層系統(tǒng),沖斷褶皺系統(tǒng)和滑脫褶皺系統(tǒng)三類構造組合。研究區(qū)裂縫發(fā)育明顯,以小型裂縫和中等尺度裂縫為主,大尺度裂縫發(fā)育較差,裂縫類型包括構造縫及成巖縫,其中主要以構造縫為主。裂縫充填程度高,充填物主要為方解石及少量石英和黃鐵礦。渝東北地區(qū)富有機質頁巖層厚度較厚,埋藏深度在250m-4000m,烴源巖熱成熟度處于高成熟度-過成熟度之間,區(qū)域蓋層總體較好,有利于渝東北地區(qū)的頁巖氣保存與富集。根據對渝東北地區(qū)構造特征的分析,選擇下寒武統(tǒng)水井沱組、魯家坪組和上奧陶統(tǒng)五峰組-下志留統(tǒng)龍馬溪組為主要勘探目的層系。優(yōu)選出下寒武統(tǒng)頁巖氣資源分布有利區(qū)為巫溪周圍地區(qū)及開縣西北部、滿月鄉(xiāng)西南部。上奧陶統(tǒng)-下志留統(tǒng)頁巖氣資源分布有利區(qū)為巫溪縣西南方向,處于紅巖向斜核部地區(qū)和開縣境內滿月鄉(xiāng)附近。
[Abstract]:Based on the related disciplines of mineral petrology, petroleum geology, tectonic geology and so on, the paper analyzes the regional geological background and the history of regional tectonic evolution through laboratory experiments and field profile observation. In order to study the influence of structural characteristics on the accumulation and preservation conditions of shale gas, the fracture characteristics and fracture characteristics are studied. Finally, the favorable blocks are predicted according to the structural preservation conditions of shale gas. It is located in the front edge of Dabashan thrust nappe belt, straddling Qinling stratigraphic area and Yangtze formation area. The strata of the study area except Devonian and Quaternary are missing. The Cityba fault divides the northeast of Chongqing into two first-order tectonic units: the North Dabashan thrust nappe belt and the southern Dabashan Foreland fold thrust belt, in which the southern Dabashan Foreland fold thrust belt along the Pingba fault. The Hejinmingsi fault is divided into the imbricate fault zone, Three secondary tectonic units, fault-fold belt and slip fold belt. The northern Dabashan nappe belt is a composite anticline. The obvious development of the fault indicates that the area experienced strong thrust. The structural style of the South Dabashan fault fold belt is "thrusting fold assemblage", forming a thrust fault system. There are three types of structural assemblages of thrust fold system and slip fold system. The fractures in the study area are obviously developed, mainly small and medium scale fractures, but poor in large scale fractures, and the types of fractures include structural fractures and lithogenic fractures. The fracture filling degree is high, the filling material is mainly calcite, a small amount of quartz and pyrite, and the thickness of organic matter rich shale is thicker in the northeast of Chongqing. The buried depth is between 250m and 4000m, the thermal maturity of hydrocarbon source rock is between high maturity and overmaturity, and the regional caprock is good, which is beneficial to the preservation and enrichment of shale gas in northeast Chongqing. The lower Cambrian Shuituo formation, Lujiaping formation and Upper Ordovician Wufeng formation and Lower Silurian Longmaxi formation are selected as the main exploration target series. The favorable area of shale gas resources distribution in Upper Ordovician and Lower Silurian is southwest of Wuxi County, located in the core area of Hongyan syncline and near Manchue Township in Kaixian.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.13

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