【摘要】：為了深入研究黔北地區(qū)海陸過渡相頁巖儲(chǔ)層微觀孔隙結(jié)構(gòu)特征,選取了二疊系龍?zhí)督M鉆井巖心頁巖樣品進(jìn)行氬離子拋光-場(chǎng)發(fā)射掃描電鏡實(shí)驗(yàn)、氮?dú)馕摳綄?shí)驗(yàn)及相關(guān)地化和等溫吸附等測(cè)試,研究頁巖微觀孔隙類型及孔隙結(jié)構(gòu)特征,并探討微觀孔隙對(duì)頁巖儲(chǔ)氣性能的影響。研究結(jié)果表明,龍?zhí)督M頁巖儲(chǔ)層的孔隙類型主要包括粒間孔、粒內(nèi)孔、有機(jī)質(zhì)孔、微裂縫4種,以礦物顆粒粒間孔和黏土礦物粒內(nèi)孔最為發(fā)育,有機(jī)質(zhì)孔發(fā)育較少,這主要是因?yàn)棰笮透衫腋@微組分為結(jié)構(gòu)穩(wěn)定的鏡質(zhì)組和惰質(zhì)組在生烴過程中不易產(chǎn)生有機(jī)質(zhì)孔;氮?dú)馕綄?shí)驗(yàn)結(jié)果顯示龍?zhí)督M頁巖孔隙類型復(fù)雜,主要表現(xiàn)為兩類:細(xì)頸廣體的墨水瓶孔隙和四邊開口的平行狹縫型孔隙,孔徑主要介于3~5 nm,以發(fā)育中孔為主,BET比表面積平均為15.846 m~2/g,BJH總孔體積平均為0.012 58 mL/g;龍?zhí)督M頁巖樣品吸附氣含量較高(平均為2.37 m~3/t),頁巖儲(chǔ)層微觀孔隙對(duì)吸附性能有重要的影響,其中吸附氣含量與頁巖的孔徑呈負(fù)相關(guān)關(guān)系,與頁巖的比表面積、孔體積呈較好的正相關(guān)關(guān)系,頁巖的納米級(jí)孔隙為烴類氣體的賦存和運(yùn)移提供了有利條件。
[Abstract]:In order to study the micro-pore structure characteristics of marine-terrestrial transitional shale reservoir in northern Guizhou Province, the Argon ion polishing-field emission scanning electron microscopy (SEM) experiment was carried out on the core shale samples of Longtan formation of Permian system. Nitrogen adsorption and desorption experiments, correlation geochemical and isothermal adsorption tests were carried out to study the micro-pore types and pore structure characteristics of shale, and the influence of micro-pores on the gas storage performance of shale was also discussed. The results show that the pore types of the shale reservoir in Longtan formation mainly include intergranular pore, intra-granular pore, organic pore and micro-fracture. The intergranular pore of mineral and the inner pore of clay mineral are the most developed, but the organic pore is less developed. This is mainly because the macerals of type 鈪，

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