【摘要】：蘇里格氣田屬于典型的低滲透砂巖巖性氣藏,在開發(fā)的過程中,部分氣井出現(xiàn)不同程度的產(chǎn)水現(xiàn)象。然而,目前對(duì)氣井產(chǎn)出水的來源及孔隙水的可動(dòng)條件認(rèn)識(shí)還不夠明確,這嚴(yán)重地影響了氣田的開發(fā)效果和開發(fā)進(jìn)程。本文綜合運(yùn)用試氣、生產(chǎn)、測井及水化學(xué)分析等資料,在對(duì)蘇東地區(qū)生產(chǎn)現(xiàn)狀及氣水分布規(guī)律研究的基礎(chǔ)上,綜合判斷出蘇東地區(qū)的產(chǎn)出水主要以盒8段的儲(chǔ)層原生沉積水為主,山1段的儲(chǔ)層原生沉積水為輔。在此基礎(chǔ)上,通過含束縛水狀態(tài)下氣體的滲流規(guī)律和氣水兩相滲流規(guī)律實(shí)驗(yàn)表明:蘇里格東區(qū)氣藏是親水氣藏,其束縛水飽和度越高氣體滲流的非線性滲流特征越明顯,氣體的滲流阻力也越大。進(jìn)而通過巖心高壓驅(qū)替實(shí)驗(yàn)、核磁共振實(shí)驗(yàn)及壓力敏感性實(shí)驗(yàn)對(duì)儲(chǔ)層原生沉積水的可動(dòng)性進(jìn)行了實(shí)驗(yàn)室研究,研究結(jié)果表明:核磁共振T2譜的T2cutoff值直接反應(yīng)了巖心中束縛水飽和度的大小,小于T2cutoff值為束縛水飽和度,而大于T2cutoff值為可動(dòng)水飽和度;對(duì)同一巖心,驅(qū)替壓力越大,孔隙中被驅(qū)出的水越多,孔隙水的可動(dòng)性越強(qiáng);對(duì)不同巖心,巖樣的孔滲越高,孔隙中原生水的可動(dòng)性越大。由此可見,孔隙中原生沉積水的可動(dòng)性與巖樣的孔隙度、滲透率及驅(qū)替壓力密切相關(guān),利用該實(shí)驗(yàn)結(jié)果得到的可動(dòng)水飽和度能夠有效表征低滲砂巖氣藏儲(chǔ)層的產(chǎn)水特征,并有效地預(yù)測氣井的產(chǎn)水規(guī)律。上述研究對(duì)蘇東地區(qū)儲(chǔ)層原生沉積水的可動(dòng)條件作出了客觀的認(rèn)識(shí)和評(píng)價(jià),可以為氣田高效建產(chǎn)提供合理的依據(jù)。
[Abstract]:Sulige gas field is a typical low permeability sandstone lithologic gas reservoir. However, the current understanding of the source of gas well water and the movable conditions of pore water is not clear enough, which seriously affects the development effect and development process of gas field. In this paper, based on the study of production status and gas-water distribution law in eastern Jiangsu, the data of gas test, production, logging and hydrochemical analysis are synthetically used. It can be concluded that the primary sedimentary water in the reservoir of member 8 is the main source of the produced water in the east of Jiangsu province, and the primary sedimentary water in the reservoir of the first member of Shan 1 is the secondary one. On this basis, the experiments of gas seepage and gas-water two-phase seepage under the condition of bound water show that the gas reservoir in Sulige East District is a hydrophilic gas reservoir, and the higher the irreducible water saturation is, the more obvious the non-linear percolation characteristics of gas percolation are. Gas seepage resistance is also greater. Furthermore, the mobility of reservoir primary sedimentary water was studied in laboratory by high pressure displacement experiment, nuclear magnetic resonance test and pressure sensitivity experiment. The results show that the T2cutoff value of NMR T2 spectrum directly reflects the irreducible water saturation in the core. The irreducible water saturation is smaller than the T2cutoff value and the moveable water saturation is greater than the T2cutoff value. For the same core, the higher the displacement pressure is, the more water is expelled out of the pore, the stronger the mobility of pore water is, and the higher the pore permeability of different core is, the greater the mobility of raw water in pore is. It can be seen that the mobility of proto-sedimentary water in pores is closely related to the porosity, permeability and displacement pressure of rock samples. The movable water saturation obtained from the experimental results can effectively characterize the water production characteristics of low permeability sandstone gas reservoirs. The water production law of gas well is predicted effectively. The above study makes an objective understanding and evaluation of the movable conditions of the primary sedimentary water in the reservoirs in the east of Jiangsu Province, and can provide a reasonable basis for the efficient production of the gas fields.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE312

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