基于分形特征的碳酸盐岩储层孔隙结构定量评价
发布时间：2018-07-29 21:04
【摘要】：伊拉克W油田Mishrif组巨厚孔隙型生屑灰岩为强非均质性储层,孔隙结构评价难度较大。结合薄片、孔渗试验和压汞毛管压力曲线资料,使用分形理论研究储层孔隙结构,建立了以分形维数定量评价孔隙型生屑灰岩储层孔隙结构的方法和标准。该储层孔隙结构分形特征可分为2类,第1类储层孔隙结构整体具有显著的"单段型"分形特征;第2类储层孔隙结构整体分形特征不显著,但其较大孔喉系统和较小孔喉系统各自具有显著的分形特征,即"多段型"分形特征。分形维数能够反映孔隙型灰岩孔隙结构的复杂程度和非均质性,分形维数越大,孔隙结构越复杂;压汞毛管压力和含水饱和度分段越多,孔隙结构非均质性越强。利用孔隙结构分形维数的分区性对储层进行分类,同一类样品压汞毛管压力曲线的相似性验证了分形维数分类结果的合理性。Ⅰ类与Ⅱ类储层多对应"多段型"分形特征,Ⅲ类与Ⅳ类储层多对应"单段型"分形特征。该研究成果对相同类型碳酸盐岩储层孔隙结构定量评价具有指导意义。
[Abstract]:The Mishrif formation of Mishrif formation in Iraq is a strong heterogeneous reservoir, and it is difficult to evaluate the pore structure. Combined with thin slice, pore permeability test and mercury injection capillary pressure curve data, the fractal theory is used to study the pore structure of the reservoir, and the method and standard for quantitative evaluation of pore structure of the pore type limestone reservoir are established by using fractal dimension. The fractal characteristics of pore structure of the reservoir can be divided into two categories, the first type of reservoir pore structure as a whole has a significant "single-segment" fractal characteristics, the second type of reservoir pore structure overall fractal characteristics are not significant, However, the larger pore throat system and the smaller pore throat system each have significant fractal characteristics, that is, "multi-segment" fractal characteristics. Fractal dimension can reflect the complexity and heterogeneity of pore structure of porous limestone. The larger the fractal dimension is, the more complex pore structure is, and the more mercury capillary pressure and water saturation are, the stronger the heterogeneity of pore structure is. The reservoir is classified by using the fractal dimension of pore structure. The similarity of mercury capillary pressure curve of the same kind of sample verifies the rationality of the classification result of fractal dimension. The type 鈪，
本文编号：2154013
[Abstract]:The Mishrif formation of Mishrif formation in Iraq is a strong heterogeneous reservoir, and it is difficult to evaluate the pore structure. Combined with thin slice, pore permeability test and mercury injection capillary pressure curve data, the fractal theory is used to study the pore structure of the reservoir, and the method and standard for quantitative evaluation of pore structure of the pore type limestone reservoir are established by using fractal dimension. The fractal characteristics of pore structure of the reservoir can be divided into two categories, the first type of reservoir pore structure as a whole has a significant "single-segment" fractal characteristics, the second type of reservoir pore structure overall fractal characteristics are not significant, However, the larger pore throat system and the smaller pore throat system each have significant fractal characteristics, that is, "multi-segment" fractal characteristics. Fractal dimension can reflect the complexity and heterogeneity of pore structure of porous limestone. The larger the fractal dimension is, the more complex pore structure is, and the more mercury capillary pressure and water saturation are, the stronger the heterogeneity of pore structure is. The reservoir is classified by using the fractal dimension of pore structure. The similarity of mercury capillary pressure curve of the same kind of sample verifies the rationality of the classification result of fractal dimension. The type 鈪，
本文编号：2154013
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