本文選題：煤層氣 + 褐煤儲層　； 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：為了探究褐煤儲層水的賦存方式及其對煤吸附性的影響、褐煤儲層的流體壓力演化歷程,選擇吐哈盆地大南湖凹陷東一勘查區(qū)的褐煤儲層,分析了褐煤儲層中水的含量及其賦存形式,采用平衡水煤樣、空氣干燥基煤樣吸附甲烷對比實(shí)驗(yàn),探討了水對褐煤吸附性的影響。采用Petro Mod盆地?cái)?shù)值模擬軟件,通過研究區(qū)“四史”模擬,揭示了煤儲層流體壓力的演變過程。研究表明,褐煤中水賦存方式包括外在水、孔隙水、分子水、結(jié)晶水4種,其中對煤吸附性影響最大的是孔隙水和分子水,其次是外在水,結(jié)晶水則對吸附幾乎沒有影響;空氣干燥基煤樣的飽和吸附量在低溫時(shí)(30-50℃)隨溫度升高而下降,而隨著溫度的繼續(xù)升高,不同褐煤樣由于不同方式賦存水的脫除造成的吸附量增加正效應(yīng)與溫度升高所致的吸附量減少負(fù)效應(yīng)此消彼長,其飽和吸附量呈現(xiàn)相反的變化趨勢;研究區(qū)褐煤儲層經(jīng)歷了穩(wěn)定構(gòu)造演化背景下的低溫埋藏史(Tmax=47℃),熱成因氣與生物成因氣均占一定的比重,但總量較小;生氣速率決定了生烴增壓的演變,而褐煤儲層煤化程度低(Ro,max=0.34%)及自生自儲的特點(diǎn)削弱了生烴增壓對流體壓力的貢獻(xiàn),氣壓最高尚不到0.02 MPa,因而褐煤的儲層壓力主要受制于埋藏史控制下的水壓變化;雖然含氣性較低(0.4 cm3/g),但隨埋深的增加,保存條件漸好,有利于煤層氣的賦存。研究成果對褐煤儲層煤層氣的勘探開發(fā)具有指導(dǎo)作用。
[Abstract]:In order to investigate the water storage mode of lignite reservoir and its influence on coal absorption, and the evolution of fluid pressure in lignite reservoir, the lignite reservoir in Dongnanhu sag of Turpan-Hami Basin was selected. The water content and its occurrence in lignite reservoir are analyzed. The effect of water on the adsorption of lignite is discussed by using equilibrium water coal sample and air dry base coal sample to adsorb methane. The evolution process of fluid pressure in coal reservoir is revealed by using Petro Mod basin numerical simulation software and "four history" simulation in the study area. The results show that there are four types of water storage in lignite, including external water, pore water, molecular water and crystalline water, among which pore water and molecular water have the greatest influence on the adsorption of coal, followed by external water, and crystal water has little effect on adsorption. The saturated adsorption capacity of air-dried coal samples decreased with the increase of temperature at 30 鈩，

本文編號：1805675