本文選題：特低滲透油藏 + 微觀孔隙結(jié)構(gòu)　； 參考：《石油鉆探技術(shù)》2017年02期

【摘要】：為了經(jīng)濟(jì)有效地開發(fā)東風(fēng)港油田特低滲透油藏,對(duì)其儲(chǔ)層的微觀孔隙結(jié)構(gòu)及滲流特征進(jìn)行了試驗(yàn)研究。以沙四段上段為例,選取具有代表性的4塊巖心,利用恒速壓汞儀器,分別獲得了其喉道半徑、孔隙半徑、孔喉半徑比和毛管壓力的分布特征;在70℃條件下,采用非穩(wěn)態(tài)法分別對(duì)4塊巖心進(jìn)行水驅(qū)油相滲試驗(yàn),獲得了特低滲透儲(chǔ)層的滲流特征。試驗(yàn)得出,喉道半徑分布范圍越寬峰值越大,孔隙半徑分布差別不明顯,孔隙半徑比因滲透率不同而不同,特低滲透巖心排驅(qū)壓力大,最大連通喉道半徑比較小,儲(chǔ)層開采難度相對(duì)較大;該儲(chǔ)層平均束縛水飽和度相對(duì)較高,隨著滲透率的升高,兩相共滲區(qū)跨度逐漸減小。研究結(jié)果表明,驅(qū)油效率和滲透率高低相關(guān)性差;正常型相對(duì)滲透率曲線對(duì)應(yīng)的多是孔喉半徑比較大、連通性較差的儲(chǔ)層,而直線型相對(duì)滲透率曲線對(duì)應(yīng)的則是孔喉半徑比相對(duì)較小、孔隙連通性較好的儲(chǔ)層。因此,厘清微觀孔隙結(jié)構(gòu)對(duì)于合理制定開發(fā)方案具有指導(dǎo)意義。
[Abstract]:In order to develop the very low permeability reservoir of Dongfeng Port oilfield economically and effectively, the microscopic pore structure and percolation characteristics of the reservoir are studied experimentally. Taking the upper member of the 4th member of Sha formation as an example, the distribution characteristics of throat radius, pore throat radius ratio and capillary pressure were obtained by using the constant velocity mercury pressure instrument and four representative cores were selected, respectively, at 70 鈩，

本文編號(hào)：1856689