本文選題：頁巖 + 微-納米孔隙��； 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：以頁巖氣為代表的非常規(guī)油氣資源潛力巨大,受到國內(nèi)外的廣泛重視,成為全球油氣勘探的熱點(diǎn)。我國頁巖氣資源非常豐富,估計(jì)儲量可達(dá)數(shù)十萬億立方米,是常規(guī)天然氣的幾倍。因此在常規(guī)油氣能源供應(yīng)日益緊張的情況下,針對頁巖氣的勘探、開發(fā)展開研究,可為我國改善油氣能源結(jié)構(gòu)、解決能源潛在威脅提供新的途徑。頁巖儲層的孔隙結(jié)構(gòu)對頁巖氣的儲集特性具有非常重要的影響。微-納米孔隙是頁巖氣賦存的重要空間,探究甲烷在頁巖微-納米孔隙中賦存狀態(tài)和賦存密度對頁巖氣藏儲氣量評估和開采具有重要的意義。本論文以重慶市涪陵地區(qū)焦頁1井(JY1)典型頁巖樣品為研究對象,利用其地層環(huán)境,在Materials Studio軟件中構(gòu)建出不同吸附基質(zhì)類型(有機(jī)質(zhì)、脆性礦物、黏土礦物)的吸附模型,并在吸附模型中構(gòu)建出不同類型孔洞結(jié)構(gòu)(矩形孔洞和三角孔洞),采用分子動力學(xué)方法研究甲烷在不同形狀及不同基質(zhì)類型的模型中的吸附過程。通過分層統(tǒng)計(jì)方法確定甲烷在不同基質(zhì)類型、不同孔洞類型和不同位置的甲烷密度分布,再利用徑向分布函數(shù)探究甲烷吸附微觀機(jī)理。結(jié)果表明:在壓強(qiáng)為30MPa,溫度為328K條件下,同一種模型中甲烷吸附均出現(xiàn)分層現(xiàn)象,甲烷在狹縫吸附和孔洞內(nèi)吸附量有一定的差異,孔洞內(nèi)的甲烷密度基本上大于狹縫中游離甲烷的密度,并且孔洞內(nèi)的甲烷狀態(tài)更趨近于液態(tài),矩形孔洞內(nèi)甲烷吸附密度值和三角孔洞內(nèi)甲烷吸附密度值略有差異。在相同條件下,不同類型的吸附模型中,甲烷吸附出現(xiàn)的分層現(xiàn)象在不同位置的具體值略有差異,有機(jī)質(zhì)模型中含氣總量比脆性礦物模型中含氣量高。最后借助掃描電鏡采集JY1井2415米深巖石樣本圖像,識別出有機(jī)質(zhì)孔隙,根據(jù)石墨吸附模型計(jì)算出不同位置的甲烷吸附密度,在頁巖樣品的微觀結(jié)構(gòu)圖中勾勒出孔隙的輪廓邊界,并沿著邊界區(qū)域賦予不同的甲烷吸附量,計(jì)算出頁巖實(shí)際儲層的含氣量,計(jì)算結(jié)果與實(shí)際現(xiàn)場解析量值接近。因此利用微觀模擬方法來評價(jià)頁巖氣宏觀含氣量具有指導(dǎo)作用。
[Abstract]:The potential of unconventional oil and gas resources, represented by shale gas, is huge, which has been paid more and more attention at home and abroad, and has become a hot spot in oil and gas exploration all over the world. China is rich in shale gas, with estimated reserves of several trillion cubic meters, several times as much as conventional natural gas. Therefore, under the condition of increasing shortage of conventional oil and gas energy supply, the research on shale gas exploration and development can provide a new way to improve the oil and gas energy structure and solve the potential energy threat in China. The pore structure of shale reservoir has a very important effect on the reservoir characteristics of shale gas. Micro-nano porosity is an important space for shale gas occurrence. It is of great significance to explore the occurrence state and density of methane in shale micro-nano pores for the evaluation and exploitation of gas storage in shale gas reservoirs. In this paper, the typical shale samples of Jiaoye 1 well JY1 in Fuling area of Chongqing were studied. By using their stratigraphic environment, the adsorption models of different adsorptive matrix types (organic matter, brittle minerals, clay minerals) were constructed in Materials Studio software. Different types of pore structures (rectangular and triangular) were constructed in the adsorption model. The adsorption process of methane in the models with different shapes and different matrix types was studied by molecular dynamics method. The density distribution of methane in different matrix types, different pore types and different locations was determined by stratified statistical method, and the microscopic mechanism of methane adsorption was explored by radial distribution function. The results show that under the pressure of 30MPa and the temperature of 328K, the adsorption of methane in the same model is stratified, and the amount of methane adsorbed in the slit is different from that in the pore. The density of methane in the pore is basically higher than that in the free methane in the slit, and the methane state in the pore is closer to the liquid state. The adsorption density of methane in the rectangular cavity is slightly different from that in the triangle hole. Under the same conditions, the stratification of methane adsorption in different types of adsorption models is slightly different in different locations, and the total gas content in organic matter model is higher than that in brittle mineral model. Finally, 2415 meters deep rock samples of JY1 well were collected by scanning electron microscope, organic pores were identified, methane adsorption density at different locations was calculated according to graphite adsorption model, and the outline boundary of pores was drawn in the microstructural diagram of shale samples. Along the boundary area, different methane adsorption amounts are assigned to calculate the gas content of the shale reservoir, and the calculated results are close to the actual analytical values in the field. Therefore, the microscopic simulation method can be used to evaluate the macroscopic gas content of shale gas.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.13

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