The influence of water flooding multiples on reservoir micro pore structure
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摘要: 目前针对大庆油田某区块水驱倍数对储层微观孔隙结构特征的研究还不系统，缺少岩心微观孔隙结构参数、孔渗以及矿物含量等参数随不同水驱倍数变化规律的量化研究，严重制约了对储层水驱微观机理的揭示。基于核磁共振技术和压汞相结合的方法，建立了随岩石物性变化而变化的核磁共振转换系数C值的确定方法，充分克服压汞法不能重复利用相同位置样品而造成的误差，以及核磁法不能准确确定转换系数C值的弊端。利用该方法分析了岩心在不同水驱倍数下孔径大小及岩心矿物成分的变化规律。不同物性岩心的孔隙度和渗透率随水驱倍数增加均出现不同程度的增大；岩心原始孔隙度和渗透率越大，岩心孔径增加的幅度越大。水驱后黏土含量降低，高岭石的相对含量降低幅度最大，黏土矿物变化和微粒运移是导致岩石物性和孔径变化的主要原因。Abstract: Recent research on the micro-pore structure characteristics of reservoirs during long-term water flooding in a block of the Daqing Oilfield is non-systematic and falls short on the quantitative research on the micro-pore structure parameters at different water flooding multiples. This poses a challenge for revealing the mechanism of reservoir alteration. To resolve this problem, this paper develops and presents a method, combining nuclear magnetic resonance (NMR) with mercury intrusion, to determine the value of nuclear magnetic resonance conversion coefficient (C) with corresponding changes of rock physical properties. Utilizing high pressure mercury intrusion to calibrate the pore diameter by NMR overcomes the shortcomings that the samples in the same position are unable to be reused by mercury intrusion and the conversion coefficient, C value, of NMR can not be accurately determined. By the new method the core diameter and the change of core mineral composition under different water injection multiples, the porosity and permeability of all experimental cores increase to different degrees during long-term water flooding. Long term water flooding of the core increases the pore size and lowers the clay content. Furthermore, the experiments show that kaolinite is affected most. Clay mineral variation and particle migration are the main reasons for the change of rock physical properties and pore size.
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Key words:
- water flooding /
- micro pore structure /
- pore size /
- clay /
- microscopic mechanism
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图 1 大庆油田某区块岩心孔隙度和渗透率随注水倍数变化
Figure 1. Changes of core porosity and permeability with water injection multiples in a block of Daqing Oilfield
图 2 大庆油田某区块岩心平均孔隙半径与物性变化
Figure 2. Average pore radius change with physical property in a block of Daqing Oilfield
图 3 大庆油田某区块不同物性岩心孔径的孔隙占比随注水倍数的变化
Figure 3. Percentage of pores in cores with different physical properties varies with water injection multiples in a block of Daqing Oilfield
图 4 大庆某区块实验岩心平均孔隙半径、均值系数和分选系数随注水倍数的变化
Figure 4. Average pore radius, mean value coefficient and sorting coefficient changes of experimental cores with water injection multiples in a block of Daqing Oilfield
图 5 大庆油田某区块实验岩心水驱前后黏土矿物含量对比
Figure 5. Clay content comparison of experimental cores before and after water flooding in a block of Daqing Oilfield
表 1 大庆油田某区块岩心原始孔隙度和渗透率以及随注水倍数的变化
Table 1. Changes of core porosity and permeability with water injection multiples in a block of Daqing Oilfield
样品编号 岩性 不同注水倍数下孔隙度/% 不同注水倍数下渗透率/(10-3 μm2) 原始 200 PV 500 PV 原始 200 PV 500 PV D-1 砂岩 27.76 27.82 28.63 760.9 765.8 793.0 D-2 砂岩 27.13 27.24 27.54 241.1 249.0 256.7 D-3 砂岩 28.52 28.82 28.96 366.0 377.6 412.8 D-4 砂岩 27.01 27.16 27.31 299.2 314.1 329.0 D-5 砂岩 28.37 28.51 28.96 539.3 576.0 588.5 D-6 泥质砂岩 26.91 27.03 27.26 131.4 133.1 136.6 
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表 2 大庆油田某区块实验岩心的基础物性参数和矿物含量
Table 2. Basic physical parameters and mineral contents of experimental cores in a block of Daqing Oilfield
样品编号 岩性 渗透率/(10-3 μm2) 孔隙度/% 矿物含量/% 黏土矿物相对含量/% 混层比/% 石英 钾长石 斜长石 方解石 黏土总量 伊蒙混层 伊利石 高岭石 绿泥石 X-1 泥质砂岩 836.2 29.36 58.0 8.2 24.9 1.1 7.9 27 9 58 6 20 X-2 砂岩 254.4 24.31 59.6 7.2 26.6 1.4 5.2 32 11 24 33 26 X-3 砂岩 380.5 26.88 56.5 8.5 27.0 1.6 6.3 15 6 75 4 28 X-4 砂岩 143.6 25.17 52.6 8.1 30.6 1.9 6.8 23 8 61 8 21 X-5 砂岩 480.7 27.35 59.6 9.4 24.9 1.7 4.3 15 7 73 5 30 X-6 泥质砂岩 123.2 25.67 50.8 7.6 31.3 1.8 8.5 41 18 24 17 21
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