APPLICATION OF PERMEABILITY PREDICTION METHOD TO LOW-RESISTIVITY AND LOW-PERMEABILITY RESERVOIRS IN PEARL RIVER ESTUARY BASIN
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摘要:
为了解决南海西部海域珠江口盆地低阻低渗油藏渗透率评价的难题，详实调研了国内外低阻低渗储层的成因，在此基础上深入分析了珠江口盆地低阻低渗储层渗透率的影响因素。研究表明，孔喉半径是导致渗透率差异大的主要原因。基于岩心资料，采用FZI法将研究区储层划分为6类流动单元，通过建立每一类流动单元的精细渗透率模型求取低阻低渗储层渗透率参数。结果表明，使用流动单元渗透率模型能够有效提高渗透率计算的精度，目前该方法已在南海西部海域各区域推广应用。
Abstract:In order to solve the problem of permeability evaluation for low-resistivity and low-permeability reservoirs in the Pearl River Estuary Basin in the western South China Sea, this paper made a detailed investigation on the origin of the low-resistivity and low-permeability reservoirs both at home and abroad, and deeply analyzed the influencing factors on reservoir permeability. The results show that the radius of pore throat is the main reason for the great difference in permeability from reservoir to reservoir. Based on core data, reservoirs are divided into six types by FZI method in this case. The permeability of low-resistivity and low-permeability reservoirs is calculated by establishing fine permeability models for each type of flow units. The results prove that the flow unit permeability model can effectively improve the accuracy of permeability calculation, and this method has been widely used in the Western South China Sea.
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表 1 相同孔隙、不同孔喉半径两块岩心物性参数对比
Table 1. Comparison of two cores with the same porosity and different pore throat radius
井名 深度/m 孔隙度/% 渗透率/mD 孔喉均值/μm X1P1 1 387.32 27.8 23.2 1.556 X3P1 1 490.55 27.7 209 5.862 
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