【摘要】：選取鄂爾多斯盆地盒8段16塊致密砂巖樣品進行恒速壓汞測試,結(jié)合同位樣品核磁共振實驗,分析了致密氣儲層孔喉分布特征;在此基礎上,運用分形幾何原理和方法,開展了致密氣儲層孔喉分形研究,并表征了分形與儲層滲流特征和孔隙結(jié)構(gòu)參數(shù)的關系。結(jié)果表明:致密氣儲層有效孔隙被亞微米—微米級孔喉所控制,其中孔隙主要為大孔和中孔,喉道由微喉道、微細喉道和細喉道所組成;致密氣儲層孔隙分布不具分形特征,而孔喉整體和喉道則符合分形結(jié)構(gòu),且分別對應分形維數(shù)D1和D2;基于儲層孔喉分形結(jié)構(gòu)與其滲流特征,將盒8段致密氣儲層孔喉分形結(jié)構(gòu)劃分為2種類型:Ⅰ型表現(xiàn)為階段式分形特征,以進汞壓力1 MPa為界,大于1 MPa孔喉具有分形特征,且儲層階段進汞飽和度主要由喉道貢獻,反之,孔喉不符合分形特征,其進汞飽和度增量由孔隙貢獻;Ⅱ型為整體式分形,進汞飽和度幾乎全由喉道貢獻。儲層孔喉分形維數(shù)與滲透率、平均喉道半徑和主流喉道半徑存在較好的負相關性,與微觀非均質(zhì)系數(shù)呈現(xiàn)較明顯的正相關性,而與孔隙度、平均孔隙半徑和平均孔喉半徑比之間沒有明顯的相關性。
[Abstract]:Sixteen tight sandstone samples from Box 8 member of Ordos Basin were selected for constant velocity mercury injection test. The pore throat distribution characteristics of tight gas reservoir were analyzed with nuclear magnetic resonance (NMR) experiments of the same sample. On this basis, the fractal theory and method of fractal geometry are used to study the pore throat fractal of tight gas reservoir, and the relationship between fractal and percolation characteristics and pore structure parameters of tight gas reservoir is characterized. The results show that the effective pores of tight gas reservoirs are controlled by submicron-micron pore throats in which the pores are mainly macropore and mesopore and the throat is composed of microlarynx and fine throat. The pore distribution of tight gas reservoir has no fractal characteristics, while the pore throat and throat accord with fractal structure, and correspond to fractal dimension D1 and D _ 2, respectively. Based on the fractal structure of reservoir pore throat and its percolation characteristics, the pore throat fractal structure of tight gas reservoir in Bo8 member is divided into two types: type I shows a stage fractal feature, with mercury pressure of 1 MPa as the boundary, and pore throat larger than 1 MPa with fractal characteristics. The mercury saturation in reservoir stage is mainly contributed by throat, whereas pore throat does not accord with fractal characteristics, and the increase of mercury saturation is contributed by pore. Type II is a integral fractal, and mercury saturation is almost entirely contributed by the throat. The fractal dimension of reservoir pore throat has a good negative correlation with permeability, average throat radius and mainstream throat radius, and has a significant positive correlation with microscopic heterogeneity coefficient, but with porosity, the fractal dimension of reservoir pore throat has a good negative correlation with permeability, average throat radius and mainstream throat radius. There is no obvious correlation between the mean pore radius and the average pore throat radius ratio.
【作者單位】： 中國石油大學(北京)地球科學學院;油氣資源與探測國家重點實驗室;中國石油勘探開發(fā)研究院廊坊分院;中國石油大學(北京)非常規(guī)天然氣研究院;
【基金】：國家自然科學基金項目(41272157) 國家科技重大專項(2016ZX05007-003) 中國石油科技創(chuàng)新基金(2014D-5006-0101) 中國石油大學(北京)科研基金(2462013YJRC038,2462015YQ0108)~~
【分類號】：TE312

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