發(fā)布時間：2018-06-27 06:54

  本文選題：頁巖氣 + 太原組　； 參考：《中國地質(zhì)大學(北京)》2017年碩士論文

【摘要】：鄂爾多斯盆地是我國最重要的大型海陸過度相沉積盆地之一。近年來隨著我國對天然氣的勘探開發(fā)力度加深,鄂爾多斯盆地北部已經(jīng)發(fā)現(xiàn)了蘇里格、榆林等大型上古生界氣田,然而對鄂爾多斯盆地南部上古生界地層的研究尚處于薄弱階段,且以往的研究主要集中在常規(guī)油氣資源和煤層氣方向,極大的制約了鄂爾多斯盆地頁巖氣的勘探開發(fā)。本文以沉積學和烴源巖生烴理論為指導,對鄂爾多斯盆地南部太原組、山西組展開研究,提出了鄂爾多斯盆地南部太原組、山西組有利泥頁巖儲層的形成環(huán)境、成藏特點。太原組、山西組是鄂爾多斯盆地上古生界主要含泥頁巖層段。根據(jù)對研究區(qū)野外實測剖面和收集到的鉆井柱狀圖,識別出研究區(qū)太原組、山西組主要發(fā)育河流相、湖泊相、三角洲相、障壁海岸相和淺海陸棚相共5種沉積相和河漫亞相、淺湖亞相、三角洲平原亞相、三角洲前緣亞相、障壁島亞相、瀉湖亞相、潮坪亞相和碳酸鹽臺地亞相共8種沉積亞相。研究區(qū)泥頁巖分布廣泛,太原組以永和、環(huán)縣為東西兩個沉積中心相研究區(qū)中部以此減薄;山西組上段和山西組下段則以這兩個沉積期的湖泊為沉積中心,向南北兩側(cè)減薄。研究區(qū)泥頁巖有機質(zhì)豐度(TOC)總體含量較高,樣品中TOC在1%以上的超過75%。通過元素分析表明研究區(qū)泥頁巖干酪根類型主要為Ⅱ1型(腐殖腐泥型)、Ⅱ2型(腐泥腐殖型)還有少量的Ⅲ型,具有很好的生氣潛力。鄂爾多斯盆地南部太原組、山西組地層的有機質(zhì)鏡質(zhì)體反射率(Ro)集中在0.8%~2.0%,大部分屬于高成熟階段。對研究區(qū)樣品X衍射分析表明,太原組、山西組泥頁巖主要以蒙脫石、伊利石、綠泥石等粘土類礦物和石英、長石等脆性礦物為主;且研究區(qū)泥頁巖孔隙發(fā)育程度高,連通性較好,滲透率極低,可以作為頁巖氣的優(yōu)良儲層。本文通過對研究區(qū)泥頁巖巖樣有機質(zhì)含量、成熟度、有機質(zhì)類型和孔隙度、滲透率的研究和研究區(qū)沉積相的研究,總結(jié)出了泥頁巖發(fā)育規(guī)律,完成了鄂爾多斯盆地南部有利區(qū)域的優(yōu)選,同時為下一步鄂爾多斯盆地的上古生代頁巖氣開發(fā)提供理了論依據(jù)。
[Abstract]:Ordos Basin is one of the most important marine and continental transitional sedimentary basins in China. In recent years, with the deepening of natural gas exploration and development in China, large Upper Paleozoic gas fields, such as Sulige and Yulin, have been discovered in the northern part of the Ordos Basin. However, the study of Upper Paleozoic strata in the south of Ordos Basin is still in a weak stage, and previous studies mainly focus on conventional oil and gas resources and the direction of coalbed methane, which greatly restricts the exploration and development of shale gas in Ordos Basin. Guided by sedimentology and hydrocarbon generation theory of source rocks, this paper studies Taiyuan formation and Shanxi formation in the south of Ordos Basin, and puts forward the forming environment and reservoir forming characteristics of shale-forming reservoirs in Taiyuan formation and Shanxi formation in the south of Ordos basin. Taiyuan formation and Shanxi formation are the main shale-bearing member of Upper Paleozoic in Ordos Basin. Based on the field measured profiles and the well drilling histogram collected in the study area, five sedimentary facies and river subfacies were identified in Taiyuan formation and Shanxi formation in the study area, which mainly developed fluvial facies, lacustrine facies, delta facies, barrier coast facies and shallow sea shelf facies. There are 8 sedimentary subfacies including shallow lake subfacies delta plain subfacies delta front subfacies barrier island subfacies lagoon subfacies tidal flat subfacies and carbonate platform subfacies. The mud shale is widely distributed in the study area, the middle part of the study area of Yonghe and Huanxian is the east and west sedimentary center facies, and the upper part of Shanxi formation and the lower part of Shanxi formation take the lake of these two sedimentary periods as the sedimentary center, thinning to the north and south sides. The total content of organic matter abundance (TOC) of shale in the study area is higher than 75% in the samples with TOC above 1%. The element analysis shows that the kerogen types of shale in the study area are mainly type 鈪，

本文編號：2073069