【摘要】：頁(yè)巖孔隙結(jié)構(gòu)及差異性是頁(yè)巖含氣性和產(chǎn)能評(píng)價(jià)的基礎(chǔ)性問(wèn)題.針對(duì)川東南彭水地區(qū)五峰組與龍馬溪組頁(yè)巖的孔隙結(jié)構(gòu)已有若干研究成果,然而在頁(yè)巖孔隙結(jié)構(gòu)差異性和有機(jī)孔定量特征方面還缺乏研究.利用低溫低壓氮?dú)馕綔y(cè)定和氬離子拋光-場(chǎng)發(fā)射掃描電鏡(FE-SEM)技術(shù),對(duì)頁(yè)巖樣品納米孔隙進(jìn)行了二維觀察與統(tǒng)計(jì)以及分形特征計(jì)算,研究了3nm至幾百nm頁(yè)巖孔徑范圍的孔隙結(jié)構(gòu)及其差異性.研究區(qū)五峰組-龍馬溪組頁(yè)巖有機(jī)孔十分發(fā)育;氮?dú)馕綔y(cè)定頁(yè)巖孔隙形狀包含開(kāi)放型圓筒狀、層狀結(jié)構(gòu)狹縫狀和墨水瓶狀等;掃描電鏡觀察有機(jī)孔形態(tài)主要有近圓形、橢圓形和多角形等.五峰組和龍馬溪組頁(yè)巖孔隙結(jié)構(gòu)具有明顯的差異性,主要體現(xiàn)在孔徑大小、形態(tài)和數(shù)量上.氮?dú)馕綔y(cè)定表明,五峰組頁(yè)巖孔隙比表面積和總孔容較龍馬溪組大,微孔所占總孔的比例也較高;五峰組頁(yè)巖孔徑相對(duì)龍馬溪組更細(xì)窄.掃描電鏡二維圖像觀察與統(tǒng)計(jì)結(jié)果表明,五峰組有機(jī)孔徑以小于35nm為主,形態(tài)以多角形為主;龍馬溪組有機(jī)孔徑以小于50nm為主,形態(tài)多呈近圓形和橢圓形.五峰組頁(yè)巖的分形維值大于龍馬溪組頁(yè)巖,說(shuō)明前者孔隙復(fù)雜程度較高.
[Abstract]:Shale pore structure and its difference are the basic problems of shale gas bearing and productivity evaluation. Some research achievements have been made on the pore structure of the shale of Wufeng formation and Longmaxi formation in Pengshui area, southeast Sichuan. However, the difference of pore structure and the quantitative characteristics of organic pores are still lacking. By means of low temperature and low pressure nitrogen adsorption and argon ion polishing and field emission scanning electron microscopy (FE-SEM), two dimensional observation, statistics and fractal characteristic calculation of nano-pores in shale samples were carried out. The pore structure and its difference in the pore size range from 3nm to hundreds of nm shale have been studied. The organic pores of the shale of Wufeng formation and Longmaxi formation in the study area are well developed; the pore shape of shale determined by nitrogen adsorption includes open cylindrical shape, stratified structure slit shape and ink bottle shape, etc. An ellipse and polygon, etc. There are obvious differences in pore structure between Wufeng formation and Longmaxi formation, mainly in pore size, morphology and quantity. The results of nitrogen adsorption show that the pore specific surface area and total pore volume of Wufeng formation are larger than those of Longmaxi formation, and the proportion of micropore to total pore is also higher, and the pore size of Wufeng formation is thinner and narrower than that of Longmaxi formation. The observation and statistical results of scanning electron microscopy showed that the organic pore size of Wufeng formation was mainly smaller than 35nm and polygonal in shape, while the organic pore size of Longmaxi formation was smaller than that of 50nm, and the shape of Wufeng formation was mostly round and elliptical. The fractal dimension of Wufeng formation shale is larger than that of Longmaxi formation shale, indicating that the porosity of the former is higher.
【作者單位】： 中國(guó)地質(zhì)大學(xué)構(gòu)造與油氣資源教育部重點(diǎn)實(shí)驗(yàn)室;中國(guó)石油大學(xué);中國(guó)石化華東油氣分公司石油勘探開(kāi)發(fā)研究院;中國(guó)地質(zhì)調(diào)查局油氣資源調(diào)查中心;
【基金】：中國(guó)地質(zhì)調(diào)查局油氣基礎(chǔ)性公益性地質(zhì)調(diào)查項(xiàng)目(No.DD20160185) 國(guó)家自然科學(xué)基金重大項(xiàng)目(No.41690134) 國(guó)家重大油氣專(zhuān)項(xiàng)(No.2016ZX05034-002-003) 國(guó)家基礎(chǔ)地質(zhì)調(diào)查項(xiàng)目(No.12120114046901) 高等學(xué)校創(chuàng)新引智計(jì)劃(No.B14031)
【分類(lèi)號(hào)】：P618.13

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