本文關(guān)鍵詞：核磁共振技術(shù)在研究超低滲-致密油儲層可動流體中的應(yīng)用——以鄂爾多斯盆地隴東地區(qū)延長組為例　出處：《礦物巖石》2017年01期 　論文類型：期刊論文

  更多相關(guān)文章： 核磁共振 超低滲-致密 隴東地區(qū) 延長組 可動流體 T_(cutoff)

【摘要】：采用核磁共振實(shí)驗(yàn)的方法研究鄂爾多斯盆地隴東地區(qū)延長組主力含油層段巖心樣品的T_2分布,并結(jié)合離心實(shí)驗(yàn)的結(jié)果,確定巖心有效滲流喉道半徑的下限值,并標(biāo)定了每塊巖心的可動流體與束縛流體的T_(2cutoff)。研究結(jié)果表明:可動流體對應(yīng)的下限離心力為2.07 MPa,根據(jù)氣水離心Washburn方程確定出巖心對應(yīng)儲層的有效滲流喉道半徑下限為0.07μm。對長6和長8不同儲層類型巖心的核磁共振結(jié)果分析可知:T_(2cutoff)與孔隙度和滲透率都沒有較好的相關(guān)性,也就是孔隙度相近或滲透率相近的巖心T_(2cutoff)有可能差異很大。不同儲層類型巖心的T_(2cutoff)差異較大:整體上,超低滲砂巖儲層巖心的T_(2cutoff)分布范圍較致密砂巖儲層巖心的小;超低滲砂巖巖心分布在9.64ms~16.68ms之間,致密砂巖巖心分布在9.64ms~24.04ms之間。分析造成這種差異的主要原因是T_(2 cutoff)除與孔隙度、滲透率有關(guān)以外,也受孔隙結(jié)構(gòu)、礦物成分和黏土類型的影響。除此之外,束縛水飽和度與孔隙度和滲透率之間都有較好的相關(guān)性,隨著孔隙度和滲透率的增加,巖心束縛水飽和度有減小的趨勢。同時也分析了T_(2cutoff)與T_2譜的位置關(guān)系,總結(jié)出4個基本規(guī)律。最后,根據(jù)國內(nèi)外油氣田開發(fā)生產(chǎn)經(jīng)驗(yàn),并結(jié)合隴東地區(qū)延長組實(shí)際,以可動流體飽和度高低為標(biāo)準(zhǔn),對巖心對應(yīng)的儲層進(jìn)行分類,結(jié)果表明:致密巖心對應(yīng)的儲層都屬于Ⅲ類儲層(可動流體飽和度介于35%~50%之間),超低滲巖心對應(yīng)的儲層有Ⅱ類儲層(可動流體飽和度介于50%~65%之間)也有Ⅲ類儲層。
[Abstract]:The distribution of TSP _ 2 in the core samples of the main oil-bearing formation of Yanchang formation in Longdong area of Ordos Basin was studied by means of nuclear magnetic resonance (NMR), and the results of centrifugal experiments were combined. The lower limit of throat radius of effective seepage flow in core is determined. The results show that the lower limit centrifugal force of movable fluid is 2.07 MPa. According to the Washburn equation of gas-water centrifugation, the lower limit of effective percolation throat radius of corresponding reservoir is 0.07 渭 m. The nuclear magnetic resonance analysis of different reservoir types of Chang 6 and Chang 8 shows that:. _ _ _. 2cutoff has no good correlation with porosity and permeability. That is, the core with similar porosity or permeability is likely to differ greatly. The TSP 2cutoffs of different reservoir types vary greatly: on the whole. The distribution range of TSP 2cutoff in ultra-low permeability sandstone reservoir core is smaller than that in dense sandstone reservoir core. The core of ultra-low permeability sandstone is between 9.64 Ms and 16.68 Ms. The core of tight sandstone is distributed between 9.64 Ms and 24.04 Ms. The main reason for this difference is that TSP _ 2cutoff is related to porosity and permeability. In addition, there is a good correlation between irreducible water saturation and porosity and permeability, with the increase of porosity and permeability. The saturation of irreducible water in core has a decreasing trend. At the same time, the location relationship between TCI _ 2cutoff) and T _ s _ 2 spectrum is analyzed, and four basic laws are summarized. According to the production experience of oil and gas field at home and abroad, combined with the reality of Yanchang formation in Longdong area, the reservoir corresponding to the core is classified according to the standard of movable fluid saturation. The results show that the reservoirs corresponding to dense cores belong to type 鈪，

本文編號：1418163