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

【摘要】：擴散是煤層甲烷運移的關(guān)鍵環(huán)節(jié)之一,而目前有關(guān)煤層中甲烷擴散特征的認識并不充分.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)中氣體擴散模式及定量表征參數(shù);應(yīng)用Simed軟件開展了擴散性能對不同煤體結(jié)構(gòu)煤層氣排采規(guī)律的影響數(shù)值研究.結(jié)果表明:煤層甲烷的擴散受化學(xué)勢梯度的驅(qū)動,產(chǎn)氣過程中體相擴散、努森擴散和構(gòu)型擴散模式并存且呈動態(tài)變化;甲烷擴散性能受氣體溫度、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)孔隙吸附甲烷會改變微孔孔徑并影響擴散路徑的空間形態(tài);煤基質(zhì)中甲烷的擴散是非熱力平衡過程,擴散系數(shù)是吸附量的函數(shù).基于擬穩(wěn)態(tài)擴散的數(shù)值研究表明,擴散性能強弱對于長期累計產(chǎn)氣量幾乎沒有影響,而對短期產(chǎn)氣速率具有較大的影響;擴散性能弱的,產(chǎn)氣速率峰值較低,但峰值之后的一段時間內(nèi)產(chǎn)氣速率相對較高;與高滲煤層相比,低滲構(gòu)造煤層的產(chǎn)氣速率對吸附時間常數(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】： 中國地質(zhì)大學(xué)構(gòu)造與油氣資源教育部重點實驗室;山西晉城無煙煤礦業(yè)集團有限責(zé)任公司煤與煤層氣共采國家重點實驗室;中國礦業(yè)大學(xué)地球科學(xué)與測繪工程學(xué)院;
【基金】：“十三五”國家科技重大專項(Nos.2016ZX05067001,2016ZX05043-001) 國家自然科學(xué)基金項目(No.41372163) 山西省煤層氣聯(lián)合研究基金資助項目(Nos.2015012014,2014012001) 山西省煤基重點科技攻關(guān)項目(Nos.MQ2014-1,MQ2014-12) 湖北省自然科學(xué)基金項目(No.2014CFB169)
【分類號】：TE37

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