發(fā)布時間：2018-05-13 07:08

  本文選題：城口 + 頁巖層系�。� 參考：《成都理工大學》2017年碩士論文

【摘要】：論文研究區(qū)位于重慶市城口縣,重慶地區(qū)經(jīng)歷的構造沉積演化有三個階段,揚子準地臺基底生成階段(晉寧期)、地臺演化階段(南華紀-三疊紀)、陸內改造階段(侏羅紀-第四紀),城口地區(qū)的沉積巖從新元古界明月組到第四系地層都有出露(除泥盆系、石炭系和古、新近系缺失外)。以城口地區(qū)寒武系下統(tǒng)水井沱組/魯家坪組頁巖為對象,分析頁巖層系構造特征與成藏條件,這對城口地區(qū)頁巖氣的后期勘探工作具有參考價值。大巴山弧形構造帶以城口斷裂作為界線進行構造單元劃分:北大巴逆沖推覆構造帶、南大巴復合前陸褶皺-沖斷帶,本文根據(jù)不同構造單元、構造樣式、褶皺特征、斷裂及裂縫特征進行研究分析。研究區(qū)經(jīng)歷了多期構造運動,形成近東西向,北西-南東向密集分布、大體平行、不對稱的褶斷構造系。構造線總體呈北西-南東向展布,受多期構造作用的疊加,斷層相互交切,褶皺多被斷層破壞,褶皺形態(tài)復雜,樣式主要表現(xiàn)為復式褶皺;斷層十分發(fā)育,以逆沖斷層為主,城口斷裂北的構造特征是褶皺和斷層發(fā)育形成的反沖構造系統(tǒng),形成許多縱斷裂,往北西向延伸在兩端被城口斷裂截切,城口斷裂以南的主要構造特征是逆沖褶皺組合,總體構造特征為明顯的破裂、變形強度自北東-南西遞變減弱的有序性、分帶性。頁巖氣具有吸附性特征,具有一定抗破壞能力,城口地區(qū)處于盆地邊緣,構造破壞強烈,抬升剝蝕作用、地層產(chǎn)狀、褶皺構造、斷裂及裂縫的發(fā)育程度對頁巖氣的成藏有較大影響。研究區(qū)在地質歷史時期,經(jīng)歷了多期次的構造改造,與褶皺伴生的斷裂十分發(fā)育,以北西-南東向的逆沖斷層為主,且具多期斷層作用的疊加,相互切割、錯位,造成大量的地層缺失,并派生出一系列的次級斷層構造,造成含氣層與頂、底板多為斷層接觸,對頁巖氣的儲存產(chǎn)生了較大的破壞作用。通過野外采集樣品進行了高分辨率電鏡掃描圖像分析、薄片微觀結構和礦物成分鑒定等實驗得出數(shù)據(jù),分析富有機質頁巖有機碳含量、有機質成熟度、有機質類型特征,進一步對城口地區(qū)下古生界頁巖層系構造特征和頁巖氣成藏條件的探討分析。
[Abstract]:The research area of this paper is located in Chengkou County, Chongqing, which has experienced three stages of tectonic and sedimentary evolution. Yangzi quasi platform basement generation stage (Jinning period), platform evolution stage (Nanhua-Triassic), intra-continental reconstruction stage (Jurassic-Quaternary), Chengkou sedimentary rocks from the Neoproterozoic Minyue formation to the Quaternary strata Exsertion (except for Devonian, Carboniferous and Paleozoic, Neogene are missing. Taking the Lower Cambrian Shale of Shuituo formation / Lujiaping formation in Chengkou area as an example, the structural characteristics and reservoir forming conditions of shale strata are analyzed, which is of reference value for the later exploration of shale gas in Chengkou area. The arc-shaped tectonic belt of Dabashan is divided into structural units with Chengkou fault as the boundary: the North Daba thrust nappe belt, the South Daba complex Foreland fold thrust belt, according to different tectonic units, structural styles, fold characteristics, etc. Fracture and fracture characteristics are studied and analyzed. The study area has undergone multiple tectonic movements, forming a nearly east-west, NW-SE dense distribution, roughly parallel, asymmetric fold tectonic system. The tectonic lines are generally NW-SE, superimposed by multiple tectonic processes, faults intersecting, folds are destroyed by faults, fold forms are complex, their patterns are mainly complex folds, faults are well developed, and thrust faults are the main faults. The structural characteristics of the north Chengkou fault are the recoil structural system formed by fold and fault development, forming many longitudinal faults, and extending northwestward by the Chengkou fault at both ends. The main structural feature of the south of Chengkou fault is the thrusting fold assemblage. The overall structural characteristics are obvious rupture, the deformation intensity is gradually weakened from the north east to the south west, and it is orderly and zonation. Shale gas has the characteristics of adsorption and anti-failure. Chengkou area is on the edge of the basin, with strong structural damage, uplift and denudation, stratigraphic occurrence and fold structure. The fault and the development degree of fracture have great influence on the formation of shale gas reservoir. In the period of geological history, the study area experienced many periods of structural transformation, and developed well with the faults associated with the fold. The thrust faults in the north west to south east direction were the main ones, and they were superimposed by the action of multiple phases of faults, cutting and displacing each other. A large number of strata are missing, and a series of secondary fault structures are derived, resulting in the contact between gas bearing strata and top and bottom plates, which has a great destructive effect on shale gas storage. High resolution electron microscope scanning image analysis, slice microstructure and mineral composition identification were used to analyze the organic carbon content, maturity and type of organic matter in organic shale. The structural characteristics of the Lower Paleozoic shale strata and the reservoir forming conditions of shale gas in Chengkou area are discussed and analyzed.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.13

【參考文獻】

相關期刊論文 前10條

1 李王鵬;劉少峰;錢濤;;城口 房縣斷裂帶的構造變形分析[J];大地構造與成礦學;2015年05期

2 胡東風;張漢榮;倪楷;余光春;;四川盆地東南緣海相頁巖氣保存條件及其主控因素[J];天然氣工業(yè);2014年06期

3 鄧賓;李智武;劉樹根;孫東;鐘勇;李金璽;湯聰;;大巴山城口弧形斷裂帶右旋走滑構造特征及其意義[J];吉林大學學報(地球科學版);2013年05期

4 張濤;尹宏偉;賈東;姚素平;胡文tD;李海濱;張勇;;下?lián)P子區(qū)構造變形特征與頁巖氣保存條件[J];煤炭學報;2013年05期

5 蔡周榮;夏斌;萬志峰;;下?lián)P子蕪湖地區(qū)后期構造活動特征及其對古生界頁巖氣保存的影響[J];煤炭學報;2013年05期

6 聶海寬;包書景;高波;邊瑞康;張培先;武曉玲;葉欣;陳新軍;;四川盆地及其周緣下古生界頁巖氣保存條件研究[J];地學前緣;2012年03期

7 丁文龍;李超;李春燕;許長春;久凱;曾維特;;頁巖裂縫發(fā)育主控因素及其對含氣性的影響[J];地學前緣;2012年02期

8 聶海寬;張金川;李玉喜;;四川盆地及其周緣下寒武統(tǒng)頁巖氣聚集條件[J];石油學報;2011年06期

9 梁興;葉熙;張介輝;舒紅林;樓基勝;姚秋昌;王高成;;滇黔北下古生界海相頁巖氣藏賦存條件評價[J];海相油氣地質;2011年04期

10 丁文龍;許長春;久凱;李超;曾維特;吳禮明;;泥頁巖裂縫研究進展[J];地球科學進展;2011年02期

相關會議論文 前1條

1 沈傳波;梅廉夫;吳敏;湯濟廣;;大巴山逆沖推覆帶構造擴展變形的年代學制約[A];第九屆全國固體核徑跡學術研討會論文集[C];2007年

相關碩士學位論文 前1條

1 蒲泊伶;四川盆地頁巖氣成藏條件分析[D];中國石油大學;2008年

，

本文編號：1882171