發(fā)布時間：2018-04-20 09:27

  本文選題：武鄉(xiāng)地區(qū) + 裂隙特征　； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：本文以武鄉(xiāng)地區(qū)巖層裂隙為研究對象,深入分析了該地區(qū)的構(gòu)造特征并恢復(fù)了構(gòu)造應(yīng)力場,研究了該地區(qū)的構(gòu)造演化史。主要經(jīng)歷了三期的構(gòu)造運(yùn)動,其中燕山期的構(gòu)造運(yùn)動對本區(qū)奠定了主要的格架。由于受構(gòu)造作用的控制,使該區(qū)的構(gòu)造裂隙比較發(fā)育,并呈現(xiàn)出了一定的規(guī)律性。在構(gòu)造作用下形成的裂隙對頁巖氣的賦存有著重要的影響。通過對研究區(qū)資料收集,對野外節(jié)理數(shù)據(jù)統(tǒng)計,室內(nèi)薄片鑒定與顯微鏡下觀察等實(shí)驗對武鄉(xiāng)地區(qū)裂縫發(fā)育特征及對頁巖氣賦存做了深入的研究,總結(jié)了武鄉(xiāng)地區(qū)構(gòu)造裂隙的發(fā)育規(guī)律,并結(jié)合該地區(qū)頁巖氣賦存的地質(zhì)條件,探討了武鄉(xiāng)地區(qū)的裂隙發(fā)育對頁巖氣賦存的影響。得出了如下認(rèn)識:(1)武鄉(xiāng)地區(qū)的構(gòu)造演化主要可以劃分為Ⅰ(印支期)、Ⅱ(燕山期)、Ⅲ(喜馬拉雅期)3個構(gòu)造層;主要構(gòu)造行跡為近NS、NE、NW向;武鄉(xiāng)地區(qū)主要經(jīng)歷印支期、燕山期及喜馬拉雅期3期構(gòu)造運(yùn)動,印支期主要以近SN向擠壓應(yīng)力為主,燕山期以NW-SE向擠壓應(yīng)力為主,喜馬拉雅早期以NW-SE向拉張應(yīng)力為主,喜馬拉雅晚期-現(xiàn)今應(yīng)力方向轉(zhuǎn)變?yōu)镹EE-SWW向擠壓應(yīng)力。(2)研究區(qū)內(nèi)主要出露劉家溝組(T1l)、和尚溝組(T1h)、新近系和第四系地層。研究區(qū)內(nèi)構(gòu)造發(fā)育較簡單,屬于單斜構(gòu)造,地層傾角較小,主要分布在5~35°,平均為13°。區(qū)內(nèi)節(jié)理多屬于高角度節(jié)理,傾角主要分布在50°~90°之間;并繪制了走向玫瑰花圖及等密度圖,反映出調(diào)查區(qū)內(nèi)主要發(fā)育兩組節(jié)理,走向分別是61°和320°,其中61°屬于主要節(jié)理方向;通過繪制節(jié)理密度等值線,反映研究區(qū)內(nèi)由南向北,節(jié)理密度為先減小再增大的趨勢。(3)結(jié)合以上研究成果和對研究區(qū)頁巖氣賦存的地質(zhì)條件的研究,主要從泥頁巖儲層滲透性和含氣性兩個方面分析了構(gòu)造裂隙發(fā)育規(guī)律對頁巖氣賦存的影響,研究結(jié)果表明在現(xiàn)今構(gòu)造應(yīng)力場的作用下,61°優(yōu)勢裂隙的發(fā)育區(qū)、宏觀、微觀裂隙的較發(fā)育區(qū)更有利于頁巖氣的賦存。
[Abstract]:In this paper, the structural characteristics and tectonic stress field in Wuxiang area are deeply analyzed, and the history of tectonic evolution in this area is studied by taking the rock seam fissures in Wuxiang area as the research object. It mainly experienced three stages of tectonic movement, among which the Yanshanian tectonic movement laid the main framework for the area. The tectonic fractures in this area are relatively developed due to the control of tectonism and present certain regularity. Fractures formed under tectonic action have an important effect on the occurrence of shale gas. Based on the data collection of the study area, the statistics of field joint data, laboratory sheet identification and microscopic observation, the characteristics of fracture development and the occurrence of shale gas in Wuxiang area were studied. This paper summarizes the development law of structural fissures in Wuxiang area and discusses the influence of fracture development on the occurrence of shale gas in Wuxiang area according to the geological conditions of shale gas occurrence in this area. It is concluded that the tectonic evolution of Wuxiang area can be divided into three tectonic layers: I (Indosinian), 鈪，

本文編號：1777207