【摘要】：為了達(dá)到更好的評價煤儲層開發(fā)潛力的目的,對直接關(guān)系到煤儲層流體可動性的煤層吸附時間進(jìn)行了研究,通過對沁水盆地壽陽和柿莊區(qū)塊3、15號煤層的煤巖進(jìn)行測試,分析了高煤階煤吸附時間的特征,討論了鏡質(zhì)體最大反射率(Rmax)、煤質(zhì)和氣體組分等因素對吸附時間的影響。研究表明:煤階,即Rmax是影響煤層吸附時間的主要因素,鏡質(zhì)組/惰質(zhì)組比值、氣體組分φ(CO_2)/φ(CH_4)和φ(CH_4)/φ(N_2)為次要因素,單一的顯微組分(鏡質(zhì)組、惰質(zhì)組)和灰分對吸附時間的影響不大。對高煤階煤巖而言,當(dāng)Rmax2.9%時,吸附時間隨Rmax的增大而增大;當(dāng)Rmax2.9%時,吸附時間隨Rmax的增大而減小,主要是由于隨煤巖演化程度增高,煤巖平衡水含量與比表面積綜合作用引起煤巖孔隙度、微孔隙結(jié)構(gòu)及比表面積下降,導(dǎo)致煤巖吸附能力下降。此外,受各顯微組分吸附能力差異、各類氣體吸附特點差異及煤層中氣體濃度差等因素的影響,鏡質(zhì)組/惰質(zhì)組、φ(CO_2)/φ(CH_4)和φ(CH_4)/φ(N_2)均與吸附時間表現(xiàn)為負(fù)向包絡(luò)關(guān)系。
[Abstract]:In order to better evaluate the development potential of coal reservoir, the adsorption time of coal seam, which is directly related to the fluid mobility of coal reservoir, is studied, and the coal rock of No. 315 coal seam in Shouyang and Shizhuang blocks in Qinshui Basin is tested. The characteristics of adsorption time of high rank coal are analyzed, and the influence of vitrinite maximum reflectance (Rmax), coal quality and gas composition on adsorption time is discussed. The results show that coal rank, that is, Rmax, is the main factor affecting the adsorption time of coal seams, the vitrinite / inertinite ratio, the gas composition 蠁 (CO2) / 蠁 (CH4) and 蠁 (CH4) / 蠁 (N2) are secondary factors, and the single macerals (vitrinite) are the secondary factors. Inertinite) and ash have little effect on adsorption time. For high-rank coal rocks, the adsorption time increases with the increase of Rmax when Rmax is 2.9%, and decreases with the increase of Rmax when Rmax2.9%, which is mainly due to the increase of evolution degree of coal and rock. The comprehensive action of equilibrium water content and specific surface area of coal and rock leads to the decrease of porosity, micropore structure and specific surface area of coal and rock, which leads to the decrease of adsorption capacity of coal and rock. In addition, under the influence of different macerals adsorption ability, different gas adsorption characteristics and gas concentration difference in coal seam, vitrinite / inertinite group, 蠁 (CO _ 2) / 蠁 (Ch _ 4) and 蠁 (Ch _ 4) / 蠁 (N _ 2) have negative envelope relationship with adsorption time.
【作者單位】： 中國石油大學(xué)(北京)地球科學(xué)學(xué)院;油氣資源與探測國家重點實驗室;中海石油(中國)有限公司非常規(guī)油氣分公司;中聯(lián)煤層氣有限責(zé)任公司;中海石油(中國)有限公司非常規(guī)油氣管理處;
【基金】：國家科技重大專項資助項目(2016ZX05044)
【分類號】：TE37

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