發(fā)布時間：2018-04-16 04:03

  本文選題：頁巖組分 + 等溫吸附　； 參考：《煤炭學(xué)報》2017年03期

【摘要】：選擇四川盆地長寧雙河鎮(zhèn)上奧陶統(tǒng)五峰組—下志留統(tǒng)龍馬溪組新鮮露頭剖面樣品,通過化學(xué)方法去除其中碳酸鹽、硅酸鹽及黃鐵礦,利用低溫二氧化碳和氮氣吸附法對各處理階段樣品的納米孔隙結(jié)構(gòu)進(jìn)行測定,通過等溫線和NLDFT分析,對孔隙結(jié)構(gòu)進(jìn)行表征并分析不同礦物組分對原巖樣品孔隙結(jié)構(gòu)的影響。結(jié)果表明,對微孔部分而言,去除碳酸鹽造成微孔體積減小,而去除硅酸鹽和黃鐵礦過程導(dǎo)致微孔體積增加,說明碳酸鹽提供了頁巖內(nèi)部分微孔體積,可能來自于溶蝕孔的影響;對介孔-大孔部分而言,孔體積隨著去礦物過程深入持續(xù)增加,說明礦物組分對這部分孔隙貢獻(xiàn)較小。去礦物過程對樣品不同尺度孔隙比例分布未產(chǎn)生明顯影響,顯示了介孔占據(jù)主要孔體積部分,微孔提供主要的表面積的特征。就孔徑分布而言,微孔部分孔徑分布受去礦物過程影響較大,而介孔-大孔部分孔徑分布受去礦物過程影響較小。全巖樣品微孔隙總體上體現(xiàn)了有機質(zhì)孔隙發(fā)育特征,不同礦物組分在一定程度上由于和有機質(zhì)處于包裹、填充、被填充的狀態(tài),對有機質(zhì)原始孔隙信息,尤其是微孔部分起到更加明顯的掩蓋作用�？偟膩碚f,有機質(zhì)是控制泥頁巖微孔隙發(fā)育的最重要因素。
[Abstract]:The fresh outcrop section samples of upper Ordovician Wufeng formation and Lower Silurian Longmaxi formation in Shuanghe Town, Changning Basin, Sichuan Basin were selected to remove carbonate, silicate and pyrite by chemical method.The pore structure of samples was measured by low temperature carbon dioxide and nitrogen adsorption method. The pore structure was characterized by isotherm and NLDFT analysis and the effect of different mineral components on pore structure of original rock samples was analyzed.The results show that the removal of carbonate leads to the decrease of the micropore volume, while the removal of silicate and pyrite leads to the increase of the micropore volume, which indicates that the carbonate provides part of the micropore volume in the shale.For the mesoporous-macroporous part, the pore volume increases continuously with the process of mineral removal, which indicates that the mineral components contribute little to the pores in this part.The demineralization process has no obvious effect on the pore proportion distribution of the samples at different scales, showing that mesoporous occupies the main pore volume and micropores provide the main surface area.As far as pore size distribution is concerned, the partial pore size distribution of micropore is greatly affected by the process of mineral removal, while the distribution of mesoporous and macroporous partial pore size is less affected by the process of mineral removal.The micropores of whole rock samples generally reflect the characteristics of organic pore development, and the different mineral components are, to some extent, information about the original pores of organic matter due to the condition that they are wrapped, filled and filled with organic matter.In particular, the micropore part plays a more obvious role in masking.Generally speaking, organic matter is the most important factor controlling the development of shale micropores.
【作者單位】： 中國科學(xué)院廣州地球化學(xué)研究所;中國科學(xué)院有機地球化學(xué)國家重點實驗室;中國科學(xué)院大學(xué);
【基金】：中國科學(xué)院戰(zhàn)略先導(dǎo)資助項目(XDB10010204)
【分類號】：P618.13

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