本文選題：煤層氣 + 高煤階煤��； 參考：《地球科學(xué)》2017年08期

【摘要】：擴(kuò)散是煤層甲烷運(yùn)移的關(guān)鍵環(huán)節(jié)之一,而目前有關(guān)煤層中甲烷擴(kuò)散特征的認(rèn)識(shí)并不充分.以沁水盆地南部高煤階煤層氣藏為例,應(yīng)用微納滲流力學(xué)理論分析了煤基質(zhì)中氣體擴(kuò)散模式及定量表征參數(shù);應(yīng)用Simed軟件開展了擴(kuò)散性能對(duì)不同煤體結(jié)構(gòu)煤層氣排采規(guī)律的影響數(shù)值研究.結(jié)果表明:煤層甲烷的擴(kuò)散受化學(xué)勢(shì)梯度的驅(qū)動(dòng),產(chǎn)氣過程中體相擴(kuò)散、努森擴(kuò)散和構(gòu)型擴(kuò)散模式并存且呈動(dòng)態(tài)變化;甲烷擴(kuò)散性能受氣體溫度、壓力、氣體種類、水分以及基質(zhì)孔隙結(jié)構(gòu)共同影響,基質(zhì)孔隙吸附甲烷會(huì)改變微孔孔徑并影響擴(kuò)散路徑的空間形態(tài);煤基質(zhì)中甲烷的擴(kuò)散是非熱力平衡過程,擴(kuò)散系數(shù)是吸附量的函數(shù).基于擬穩(wěn)態(tài)擴(kuò)散的數(shù)值研究表明,擴(kuò)散性能強(qiáng)弱對(duì)于長(zhǎng)期累計(jì)產(chǎn)氣量幾乎沒有影響,而對(duì)短期產(chǎn)氣速率具有較大的影響;擴(kuò)散性能弱的,產(chǎn)氣速率峰值較低,但峰值之后的一段時(shí)間內(nèi)產(chǎn)氣速率相對(duì)較高;與高滲煤層相比,低滲構(gòu)造煤層的產(chǎn)氣速率對(duì)吸附時(shí)間常數(shù)更敏感.
[Abstract]:Diffusion is one of the key links of methane migration in coal seams, but the characteristics of methane diffusion in coal seams are not well understood at present. Taking the high-rank coalbed methane reservoir in the southern Qinshui Basin as an example, the gas diffusion model and quantitative characterization parameters in coal matrix are analyzed by using micro-nano percolation mechanics theory. The effect of diffusivity on coal bed methane (CBM) production with different coal structure was studied by Simed software. The results show that the diffusion of methane in coal seam is driven by the chemical potential gradient, the mass diffuses in the gas production process, the Knudsen diffusion model and the configuration diffusion mode coexist and change dynamically, the methane diffusion performance is affected by the gas temperature, pressure, gas type, The adsorption of methane by matrix pore will change the pore size of micropore and affect the spatial morphology of diffusion path, and the diffusion of methane in coal matrix is a non-thermal equilibrium process, and the diffusion coefficient is a function of adsorption capacity. The numerical study based on quasi-steady diffusion shows that the diffusion performance has little effect on the long-term cumulative gas production, but has a great effect on the short-term gas production rate, while the diffusion performance is weak, the peak value of the gas production rate is lower. However, the gas production rate is relatively high in the period after the peak value, and the gas production rate of the low permeability structure coal seam is more sensitive to the adsorption time constant than that of the high permeability coal seam.
【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;山西晉城無(wú)煙煤礦業(yè)集團(tuán)有限責(zé)任公司煤與煤層氣共采國(guó)家重點(diǎn)實(shí)驗(yàn)室;中國(guó)礦業(yè)大學(xué)地球科學(xué)與測(cè)繪工程學(xué)院;
【基金】：“十三五”國(guó)家科技重大專項(xiàng)(Nos.2016ZX05067001,2016ZX05043-001) 國(guó)家自然科學(xué)基金項(xiàng)目(No.41372163) 山西省煤層氣聯(lián)合研究基金資助項(xiàng)目(Nos.2015012014,2014012001) 山西省煤基重點(diǎn)科技攻關(guān)項(xiàng)目(Nos.MQ2014-1,MQ2014-12) 湖北省自然科學(xué)基金項(xiàng)目(No.2014CFB169)
【分類號(hào)】：TE37

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