基于显微红外光谱技术的岩石微观渗流特性研究

发布时间：2018-05-17 21:00

本文选题：岩石力学 + 显微红外光谱　；参考：《岩石力学与工程学报》2017年S1期

【摘要】：岩石的渗流特性决定了石油开采效率,对于储层的定量评价具有重要意义。为了解岩石中孔洞裂缝以及不同介质对其渗流性能的影响规律,利用显微红外光谱成像技术,对岩石样品进行光谱成像试验,根据样品的光谱图像和吸光度A值,将该岩石截面划分为孔隙裂缝区域、孔隙与岩石介质过渡区域、白云岩介质区域;据此建立能够精确表征真实岩石结构的有限元模型,对其微观渗流特性进行数值模拟研究。研究结果表明:(1)该岩石样品的特征吸收波段为2 500~2 700 cm~(-1),说明样品介质主要为白云岩;(2)同一平面的二维流动中流体的动力黏度越大,流体在孔道中的流动速度越小;(3)多孔白云岩介质的渗透率较小时,流体主要以沿裂隙孔道的自由流动为主,而介质中渗流运动较弱;随着介质渗透率的增大,多孔介质中的流体渗流运动逐渐明显;(4)孔喉尺寸较小的孔道,毛细管阻力较大,孔道中流体不发生流动;孔喉尺寸扩大后,优势水流路径数量增加,岩石截面中流体流动范围增大,流动速度变大。此研究结果可以为石油开采中储层改造方案的制定提供科学依据,从而有效提高石油开采效率。
[Abstract]:The percolation characteristic of rock determines the oil production efficiency, which is of great significance to the quantitative evaluation of reservoir. In order to understand the influence of pore cracks in rock and the influence of different media on its percolation performance, a spectral imaging experiment was carried out on rock samples by means of micro-infrared spectroscopy imaging technique. According to the spectral images and absorbance A values of the samples, The cross section of the rock is divided into pore fracture area, pore to rock medium transition region, dolomite medium region, and the finite element model which can accurately represent the real rock structure is established, and the microscopic seepage characteristics of the rock are studied numerically. The results show that the characteristic absorption band of the sample is 2 500 ~ (2 700) cm ~ (-1) ~ (-1), which indicates that the sample medium is mainly dolomite 2) the larger the dynamic viscosity of the fluid is in the two dimensional flow in the same plane. The smaller the flow velocity of fluid in the pore channel is, the smaller the permeability of porous dolomite medium is. The fluid mainly flows freely along the fissure channel, but the seepage movement is weaker in the medium, and with the increase of the permeability of the medium, the permeability of the porous dolomite medium increases with the increase of the permeability of the porous dolomite medium. The fluid percolation movement in porous media gradually became obvious (P < 0.05). The capillary resistance of the pore throat was larger, the fluid did not flow in the pore, and the number of dominant flow paths increased with the expansion of pore throat size. In the rock section, the fluid flow range increases and the flow velocity increases. The results of this study can provide scientific basis for the formulation of reservoir reconstruction scheme in oil production, and thus effectively improve the efficiency of oil production.
【作者单位】：中国石油大学(华东)储运与建筑工程学院;中国石化胜利油田分公司油气勘探管理中心;西南石油大学石油与天然气工程学院;
【基金】：国家自然科学基金面上项目(41272141) 国家科技重大专项(2016ZX05002 002)~~
【分类号】：TU45

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