本文關(guān)鍵詞： 滲流 頁(yè)巖 納米孔隙 表觀滲透率　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：頁(yè)巖的滲流與許多資源與環(huán)境問(wèn)題相關(guān)。深入的研究頁(yè)巖中氣體滲流特征對(duì)于頁(yè)巖氣的形成與開(kāi)采問(wèn)題、核廢料地下儲(chǔ)存安全性評(píng)價(jià)以及CO2、CH4等溫室氣體封存性能評(píng)價(jià)油重要的理論意義和現(xiàn)實(shí)意義。本文在廣泛的研究了國(guó)內(nèi)外現(xiàn)有的研究成果,選取具有代表性的柴達(dá)木盆地東部石炭系克魯克組頁(yè)巖進(jìn)行研究。利用實(shí)驗(yàn)室自主設(shè)計(jì)的儀器,在模擬實(shí)際地層溫度壓力的情況下,對(duì)頁(yè)巖進(jìn)行了CH4、N2、He三種氣體的滲流實(shí)驗(yàn),研究頁(yè)巖納米孔隙中復(fù)雜的氣體滲流問(wèn)題。根據(jù)國(guó)家相關(guān)的測(cè)試標(biāo)準(zhǔn),測(cè)定研究區(qū)內(nèi)頁(yè)巖的TOC含量幾乎都大于1%,達(dá)到了產(chǎn)氣的標(biāo)準(zhǔn)且生烴能力強(qiáng);但是熱成熟度相對(duì)來(lái)說(shuō)比較低,干酪根類型以Ⅱ型為主;礦物成分主要包括石英等碎屑礦物、白云石等碳酸鹽礦物、伊/蒙混層為主的粘土礦物,說(shuō)明研究區(qū)內(nèi)頁(yè)巖是具有一定開(kāi)發(fā)價(jià)值的烴源巖。利用壓汞法、氮?dú)馕椒岸趸嘉椒▉?lái)測(cè)量頁(yè)巖納米孔徑,結(jié)果表明研究區(qū)頁(yè)巖宏孔范圍主要分布在50nm-100nm,所占比例在35%-60%;微孔所占比例較少,在10%左右;中孔分布密集,所占比例也在37%-54%。通過(guò)克努森數(shù)(kn)的大小將頁(yè)巖納米孔隙中氣體的流動(dòng)狀態(tài)分為達(dá)西流、滑脫流以及擴(kuò)散流,建立了頁(yè)巖納米孔隙氣體流動(dòng)數(shù)學(xué)模型。通過(guò)模型得出頁(yè)巖納米孔隙的表觀滲透率與平均壓力的倒數(shù)呈現(xiàn)正比例關(guān)系。根據(jù)頁(yè)巖滲透率測(cè)試的實(shí)驗(yàn)數(shù)據(jù),本文得出達(dá)西滲透率不隨著壓力的變化而變化,滑脫流以及擴(kuò)散流對(duì)表觀滲透率的貢獻(xiàn)值隨著壓力的增大而減小。本文還發(fā)現(xiàn)同一塊巖樣氦氣所測(cè)得的表觀滲透率最大,其次是甲烷,氮?dú)馑鶞y(cè)得的值最小。對(duì)頁(yè)巖進(jìn)行了不同方向的滲透率的研究,發(fā)現(xiàn)平行于地層切割的頁(yè)巖比垂直于地層切割的頁(yè)巖表觀滲透率大。最后綜合分析了壓力、頁(yè)巖孔徑及頁(yè)巖巖性對(duì)滲透率的影響,發(fā)現(xiàn)頁(yè)巖的表觀滲透率隨著壓力的增大而減小,并且與頁(yè)巖的孔徑分布、礦物成分以及氣體分子平均自由程有關(guān)。
[Abstract]:The percolation of shale is related to many resource and environmental problems. The characteristics of gas percolation in shale are deeply studied on the formation and exploitation of shale gas. The important theoretical and practical significance of nuclear waste underground storage safety evaluation and evaluation of greenhouse gas storage performance such as CO _ 2C _ (2) H _ (4). In this paper, the existing research results at home and abroad have been extensively studied. The typical carboniferous Kruke formation shale in the eastern Qaidam Basin was studied. The seepage experiments of three kinds of gas Ch _ 4 and N _ 2H _ 2He were carried out on the shale under the condition of simulating the actual formation temperature and pressure by using the instrument designed independently by the laboratory. The complex gas percolation problem in shale nano-pores is studied. According to the national relevant test standards, the TOC content of shale in the study area is almost more than 1, which has reached the standard of gas production and has strong hydrocarbon generation ability. However, the thermal maturity is relatively low, the type of kerogen is mainly type 鈪，

本文編號(hào)：1507161