本文關(guān)鍵詞： 致密灰?guī)r 表觀滲透率 滑脫流 擴(kuò)散流 柴達(dá)木盆地東部　出處：《中國(guó)巖溶》2017年01期 　論文類型：期刊論文

【摘要】：碳酸鹽巖儲(chǔ)層孔隙系統(tǒng)復(fù)雜。對(duì)空隙結(jié)構(gòu)特征、滲流機(jī)理的研究直接影響到油氣資源的勘探和開(kāi)采。本研究選取了柴達(dá)木盆地東部地區(qū)ZK5-2鉆井中石炭系的5塊致密灰?guī)r樣品,通過(guò)XRD、XRF技術(shù)對(duì)灰?guī)r的礦物成分、化學(xué)成分進(jìn)行定量測(cè)試;利用氦氣雙室法與孔徑分布實(shí)驗(yàn)(包括壓汞法、氮?dú)馕椒�、二氧化碳吸附�?確定灰?guī)r的孔隙度與空隙的孔徑分布;用CH_4、N_2、CO_2、He四種氣體進(jìn)行滲流實(shí)驗(yàn)確定灰?guī)r的表觀滲透率。研究結(jié)果表明:致密灰?guī)r的表觀滲透率與其孔隙度沒(méi)有明顯的關(guān)系。表觀滲透率由達(dá)西流、滑脫流與擴(kuò)散流三部分組成,表觀滲透率大小按CH_4、N_2、CO_2、He的順序依次增加,其中He所測(cè)得的表觀滲透率明顯高于其他三種氣體�；摿鲗�(duì)表觀滲透率的貢獻(xiàn)受到分子平均自由程與孔徑的雙重控制,當(dāng)氣體分子平均自由程與巖石內(nèi)集中出現(xiàn)的孔徑接近時(shí),在這些相近孔徑的孔隙中會(huì)出現(xiàn)明顯滑脫現(xiàn)象,此時(shí)滑脫流將對(duì)表觀滲透率產(chǎn)生較大的貢獻(xiàn)。分子平均自由程較大的氣體在致密灰?guī)r中主要以擴(kuò)散的形式運(yùn)移。巖石孔徑小于分子平均自由程的孔隙所占比例越大,擴(kuò)散流對(duì)表觀滲透率的貢獻(xiàn)度越高。
[Abstract]:The pore system of carbonate reservoir is complex. The study of pore structure and percolation mechanism has a direct influence on the exploration and exploitation of oil and gas resources. In this study, five samples of Carboniferous dense limestone in ZK5-2 drilling in the eastern part of Qaidam Basin are selected. The mineral composition and chemical composition of limestone were measured quantitatively by XRD- XRF technique, the pore size distribution of limestone was determined by helium double chamber method and pore size distribution experiment (including mercury injection method, nitrogen adsorption method, carbon dioxide adsorption method). The apparent permeability of the dense limestone is determined by the percolation experiment with the gas Ch _ 4N _ 2CO _ 2He. The results show that the apparent permeability of the dense limestone has no obvious relationship with its porosity. The apparent permeability is composed of three parts: Darcy flow, slippage flow and diffusion flow. The apparent permeability increases in the order of Ch _ 4N _ 2C _ 2C _ 2He, in which the apparent permeability measured by he is obviously higher than that of the other three gases. The contribution of slippage to the apparent permeability is controlled by the molecular average free path and pore size. When the average free path of gas molecules is close to the pore size concentrated in the rock, there will be obvious slippage in the pores of these similar pore sizes. The gas with larger molecular average free path is mainly transported in the form of diffusion in dense limestone. The larger the pore size of rock is less than the molecular average free path, the larger the proportion of pores is. The contribution of diffusion flow to apparent permeability is higher.
【作者單位】： 中國(guó)地質(zhì)大學(xué)(北京)水資源與環(huán)境學(xué)院;中國(guó)地質(zhì)科學(xué)院地質(zhì)力學(xué)研究所;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(40772208,41272387) 中國(guó)地質(zhì)調(diào)查局地質(zhì)調(diào)查項(xiàng)目(DD20160173)
【分類號(hào)】：P618.13

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