發(fā)布時(shí)間：2018-02-01 11:06

  本文關(guān)鍵詞： 龍馬溪組頁巖 吸附氣 游離氣 等溫吸附/解吸 壓力　出處：《天然氣地球科學(xué)》2017年09期 　論文類型：期刊論文

【摘要】：頁巖含氣量對(duì)頁巖氣田儲(chǔ)量計(jì)算至關(guān)重要,直接關(guān)系到頁巖氣的產(chǎn)量、遞減規(guī)律等。頁巖氣以游離氣和吸附氣形式賦存,有重量法等溫吸附、容量法等溫吸附、現(xiàn)場(chǎng)含氣量測(cè)試等不同方法測(cè)試吸附氣、游離氣。通過測(cè)試頁巖氣降壓解吸過程中氣體體積變化來測(cè)量吸附氣量,首次建立了同時(shí)測(cè)試頁巖吸附氣、游離氣的方法。該方法采用柱狀頁巖巖心,模擬不同溫度、壓力、含水、真實(shí)孔隙結(jié)構(gòu)等條件,消除了等溫吸附曲線的負(fù)吸附異常;分析了有機(jī)質(zhì)含量、壓力、溫度、含水、氣體組成等因素對(duì)頁巖吸附量的影響。實(shí)驗(yàn)結(jié)果表明,頁巖的甲烷吸附量隨壓力增加而增加,壓力大于12MPa后達(dá)到吸附/解吸動(dòng)態(tài)平衡,吸附量不再增加;有機(jī)質(zhì)含量TOC增加時(shí)吸附量增加;溫度增加時(shí)吸附量降低;頁巖含水后吸附量降低;甲烷吸附量高于氮?dú)馕搅?焦石壩龍馬溪組主力層頁巖在溫度20℃、壓力30MPa下頁巖氣吸附氣量介于1.8~3.1m~3/t之間,總含氣量介于5.1~6.5m~3/t之間,吸附氣占總氣量40%左右。
[Abstract]:Shale gas content is very important to the calculation of shale gas reserves, which is directly related to the production and decline of shale gas. Shale gas occurs in the form of free gas and adsorption gas, with isothermal adsorption by gravimetric method and isothermal adsorption by capacity method. The adsorption gas volume was measured by measuring the volume change of the gas during the depressurization and desorption of shale gas, and the simultaneous measurement of the shale adsorbed gas was established for the first time. The method uses columnar shale core to simulate the conditions of different temperature, pressure, water content and real pore structure, thus eliminating the negative adsorption anomaly of isothermal adsorption curve. The effects of organic matter content, pressure, temperature, water content and gas composition on the adsorption capacity of shale are analyzed. The experimental results show that the methane adsorption capacity of shale increases with the increase of pressure. When the pressure is more than 12MPa, the adsorption / desorption dynamic equilibrium is reached, and the adsorption amount is no longer increased. When the content of organic matter (TOC) increased, the adsorption capacity increased. The adsorption capacity decreases with the increase of temperature. The adsorption capacity of shale decreases after water cut. The adsorption capacity of methane is higher than that of nitrogen. At 20 鈩，

本文編號(hào)：1481709