核磁共振技术在研究超低渗-致密油储层可动流体中的应用——以鄂尔多斯盆地陇东地区延长组为例

发布时间：2018-01-13 08:09

  本文关键词：核磁共振技术在研究超低渗-致密油储层可动流体中的应用——以鄂尔多斯盆地陇东地区延长组为例　出处：《矿物岩石》2017年01期 　论文类型：期刊论文

  更多相关文章： 核磁共振 超低渗-致密 陇东地区 延长组 可动流体 T_(cutoff)

【摘要】：采用核磁共振实验的方法研究鄂尔多斯盆地陇东地区延长组主力含油层段岩心样品的T_2分布,并结合离心实验的结果,确定岩心有效渗流喉道半径的下限值,并标定了每块岩心的可动流体与束缚流体的T_(2cutoff)。研究结果表明:可动流体对应的下限离心力为2.07 MPa,根据气水离心Washburn方程确定出岩心对应储层的有效渗流喉道半径下限为0.07μm。对长6和长8不同储层类型岩心的核磁共振结果分析可知:T_(2cutoff)与孔隙度和渗透率都没有较好的相关性,也就是孔隙度相近或渗透率相近的岩心T_(2cutoff)有可能差异很大。不同储层类型岩心的T_(2cutoff)差异较大:整体上,超低渗砂岩储层岩心的T_(2cutoff)分布范围较致密砂岩储层岩心的小;超低渗砂岩岩心分布在9.64ms~16.68ms之间,致密砂岩岩心分布在9.64ms~24.04ms之间。分析造成这种差异的主要原因是T_(2 cutoff)除与孔隙度、渗透率有关以外,也受孔隙结构、矿物成分和黏土类型的影响。除此之外,束缚水饱和度与孔隙度和渗透率之间都有较好的相关性,随着孔隙度和渗透率的增加,岩心束缚水饱和度有减小的趋势。同时也分析了T_(2cutoff)与T_2谱的位置关系,总结出4个基本规律。最后,根据国内外油气田开发生产经验,并结合陇东地区延长组实际,以可动流体饱和度高低为标准,对岩心对应的储层进行分类,结果表明:致密岩心对应的储层都属于Ⅲ类储层(可动流体饱和度介于35%~50%之间),超低渗岩心对应的储层有Ⅱ类储层(可动流体饱和度介于50%~65%之间)也有Ⅲ类储层。
[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，

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