本文關(guān)鍵詞： 煤層氣 水溶氣 溶解度 覆壓下孔隙度 水文地質(zhì)控氣 阜康礦區(qū)　出處：《中國礦業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：為了評價(jià)阜康礦區(qū)煤儲層水溶氣含量的,研究了不同溫度、壓力、礦化度、煤層氣成分組成、儲層水離子類型條件下煤層氣溶解度的變化規(guī)律;基于氣體在電解質(zhì)溶液中的溶解機(jī)理,對比分析了氣體溶解度的計(jì)算方法,分別建立了0~3MPa CO2、CH4、N2溶解度計(jì)算模型和3~30MPa CH4溶解度計(jì)算模型;在此基礎(chǔ)之上,建立了不同溫度、壓力、礦化度、不同氣體成分組成條件下,煤層氣溶解度的解析計(jì)算模型,模型計(jì)算的煤層氣溶解度與實(shí)測的煤層氣在煤儲層水中的溶解度相對誤差小于4%;對阜康礦區(qū)煤樣進(jìn)行了覆壓下孔隙度的物理模擬,探討了阜康礦區(qū)煤儲層孔隙度與有效應(yīng)力之間的關(guān)系,建立了煤儲層孔隙度與有效應(yīng)力之間的計(jì)算模型,提出了利用常壓下所測得的煤儲層孔隙度推算原位煤儲層孔隙度的數(shù)值模擬方法;在煤儲層孔隙度和煤層氣溶解度數(shù)值模擬的基礎(chǔ)上,建立了煤儲層水溶氣含量的數(shù)值模擬方法,估算出阜康礦區(qū)八道灣組45號煤煤層水溶氣含量介于0.043~0.063m3/t之間,45號煤煤儲層水溶氣含量隨埋深先增大后減小,在埋深800~900m處,水溶氣含量最大。探討了水文地質(zhì)條件對煤儲層風(fēng)氧化帶邊界深度、煤儲層含氣性以及儲層壓力的影響,認(rèn)為水力封堵控氣作用對阜康礦區(qū)煤儲層含氣性起主要控制作用。
[Abstract]:In order to evaluate the water soluble gas content of coal reservoir in Fukang mining area, the variation law of coal bed methane solubility under different temperature, pressure, mineralization degree, composition of coal bed gas and reservoir water ion type is studied. Based on the dissolution mechanism of gas in electrolyte solution, the calculation methods of gas solubility are compared and analyzed, and the models for calculating the solubility of 0 ~ 3MPa CO _ 2CO _ 2H _ 4H _ 4N _ 2 and 3N _ 3MPa CH4 are established, respectively, on the basis of which, different temperatures and pressures are established. The analytical calculation model of the solubility of coalbed methane under the conditions of different composition of gases, The relative error between the calculated solubility of CBM and the measured solubility of CBM in coal reservoir water is less than 4. The porosity of coal samples in Fukang mining area is simulated under overpressure. The relationship between porosity and effective stress of coal reservoir in Fukang mining area is discussed, and the calculation model between porosity and effective stress of coal reservoir is established. A numerical simulation method for calculating the porosity of in-situ coal reservoir based on the porosity of coal reservoir and the solubility of coalbed methane is presented, based on the numerical simulation of porosity of coal reservoir under normal pressure. A numerical simulation method of water soluble gas content in coal reservoir is established. It is estimated that the water dissolved gas content in coal seam No. 45 of Badaowan formation in Fukang mining area is between 0.043 and 0.063 m3 / t. The water dissolved gas content in coal reservoir No. 45 increases first and then decreases with burial depth of 800 ~ 900m. The effect of hydrogeological conditions on the boundary depth of wind oxidation zone, gas content and reservoir pressure of coal reservoir is discussed. It is considered that hydraulic plugging and controlling gas action play a major role in controlling the gas content of coal reservoir in Fukang mining area.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13

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