本文選題：沁南地區(qū) + 高階煤儲層��； 參考：《中國礦業(yè)大學》2017年碩士論文

【摘要】：煤儲層孔隙結(jié)構(gòu)類型是控制儲層流體流動差異性的根本原因。論文在系統(tǒng)分析沁南地區(qū)高階煤儲層基本特征的基礎(chǔ)上,綜合運用高壓壓汞、低溫液氮吸附和低溫CO2吸附實驗對研究區(qū)樣品進行全尺度孔隙結(jié)構(gòu)表征,建立了全尺度孔隙結(jié)構(gòu)模型,進而探討了儲層基本特征及孔隙結(jié)構(gòu)特征對流體流動差異性的控制作用。結(jié)果顯示,以等粒度無煙煤1號和石英砂巖為對比背景,指出高階煤各級孔隙均較為發(fā)育,孔比表面積極高,尤其以超微孔孔隙極為發(fā)育,無煙煤1號微孔-過渡孔較為發(fā)育,而石英砂巖各級孔隙都均不發(fā)育�；诜中畏椒�,指出壓汞和低溫液氮孔徑拼接孔隙尺度為100nm,實現(xiàn)了壓汞-液氮-低溫CO2全尺度孔隙結(jié)構(gòu)拼接,識別出3種高階煤全尺度孔隙結(jié)構(gòu)類型。各級及全尺度孔容和比表面積隨鏡質(zhì)組、固定碳(煤級)增加及粒度減小總體呈正相關(guān)相關(guān),而與惰質(zhì)組、礦物含量和灰分產(chǎn)率負相關(guān)。研究區(qū)樣品甲烷吸附能力隨鏡質(zhì)組、固定碳含量的增加而增加,隨惰質(zhì)組、灰分產(chǎn)率的增加而降低,與揮發(fā)分產(chǎn)率無明顯關(guān)系;隨著壓汞孔體積、壓汞孔比表面積、低溫液氮BJH總孔體積、BET比表面積、低溫CO2吸附DFT總孔體積和孔比表面積的增加而增加。隨著粒度減小,VL由31.55 cm3/g增加至47.41 cm3/g,PL由1.07MPa波動降低至0.49MPa。隨著鏡質(zhì)組含量增加研究區(qū)樣品可離出水含量表現(xiàn)出先減少后增加的趨勢,可壓入水含量變化規(guī)律不明顯;隨著惰質(zhì)組含量的增加,可離出水含量減少而可壓入水含量增加;隨這灰分產(chǎn)率增加,水可動性增加;固定碳含量增加,水的可流動性減弱;總孔容及微孔和過渡孔孔容的增加,水的可動性增強;隨著潤濕角的增大,可離出水含量增加而可壓入水含量波動較大,變化規(guī)律不明顯。
[Abstract]:The type of pore structure in coal reservoir is the fundamental reason to control the difference of fluid flow. On the basis of systematic analysis of the basic characteristics of high-order coal reservoirs in Qinnan area, the pore structure of samples in the study area was characterized by high-pressure mercury injection, low-temperature liquid nitrogen adsorption and low-temperature CO2 adsorption experiments. The full-scale pore structure model is established, and the control effect of reservoir basic characteristics and pore structure characteristics on fluid flow difference is discussed. The results show that the pores of higher order coal are relatively developed and the pore specific surface is positive, especially the ultramicro pore and the transition pore of anthracite No. 1 are relatively developed in comparison with quartz sandstone and anthracite No. 1 as the contrast background, the results show that the pore ratio of high-order coal is relatively high, especially the ultramicro pore is extremely developed. The pores of quartz sandstone are not developed at all levels. Based on the fractal method, it is pointed out that the pore size of mercury injection and low temperature liquid nitrogen pore splicing is 100 nm, and the full scale pore structure splicing of mercury-liquid nitrogen and low temperature CO2 is realized, and three types of high-order coal full-scale pore structures are identified. The increase of fixed carbon (coal grade) and the decrease of particle size were positively correlated with the increase of fixed carbon (coal grade) and the decrease of particle size in the vitrinite group, but negatively correlated with the mineral content and ash yield in the inertinite group. The methane adsorption capacity of the samples increased with the increase of the fixed carbon content in vitrinite group, and decreased with the increase of ash yield in the inertinite group, which had no obvious relationship with the volatile yield, and the specific surface area of mercury porphyry pore increased with the volume of mercury injection pore, and the specific surface area of mercury injection pore increased with the increase of ash yield in inertinite group. The total pore volume of low temperature liquid nitrogen (BJH) was increased with the increase of the total pore volume and pore specific surface area of DFT adsorbed by low temperature CO2. As the particle size decreases, the VL increases from 31.55 cm3/g to 47.41 cm 3 / g PL from 1.07MPa fluctuation to 0.49 MPA. With the increase of vitrinite content, the content of extractable water decreased first and then increased, but the change of compressible water content was not obvious, with the increase of inertinite content, the content of detachable water decreased and the content of compressible water increased. With the increase of ash yield, the water mobility increases; the fixed carbon content increases, the water fluidity weakens; the total pore volume and the micropore and transition pore volume increase; the water mobility increases with the increase of wetting angle. The content of removable effluent increased, but the content of compressible water fluctuated greatly, but the law of change was not obvious.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.13

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