选取哈萨克斯坦让纳若尔碳酸盐岩油藏孔隙型、裂缝型、裂缝孔隙型及复合型岩心开展水淹层电性响应特征实验,重点分析了注入水矿化度对碳酸盐岩储集层电性响应特征的影响,同时基于利用电阻率计算孔隙型储集层油水相对渗透率的数学模型与发育裂缝的储集层两相流相对渗透率模型,结合实验分析结果制定了复杂孔隙结构碳酸盐岩油藏水淹层划分标准。研究表明：注入水矿化度是影响碳酸盐岩储集层电阻率的主要因素,注入低矿化度水（淡水）时,电阻率与含水饱和度的关系曲线形态呈U型;注入高矿化度水（咸水）时,电阻率与含水饱和度的关系曲线形态呈L型。碳酸盐岩油藏水淹层划分标准具体为：①孔隙型储集层油层含水率（fw）范围为fw≤5%,弱水淹层含水率范围为5%<fw≤20%;中水淹层含水率范围为20%<fw≤50%;强水淹层含水率范围为fw>50%;②裂缝型、裂缝孔隙型、复合型储集层油层含水率范围为fw≤5%,弱水淹层含水率范围为5%<fw≤10%;中水淹层含水率范围为10%<fw≤50%;强水淹层含水率范围为fw>50%。图10表3参20
王飞
,
边会媛
,
赵伦
,
俞军
,
谭成仟
. 复杂碳酸盐岩油藏水淹层电性响应特征与划分标准--以哈萨克斯坦让纳若尔油田为例[J]. 石油勘探与开发, 2020
, 47(6)
: 1205
-1211
.
DOI: 10.11698/PED.2020.06.13
Experiments of electrical responses of waterflooded layers were carried out on porous, fractured, porous-fractured and composite cores taken from carbonate reservoirs in the Zananor Oilfield, Kazakhstan to find out the effects of injected water salinity on electrical responses of carbonate reservoirs. On the basis of the experimental results and the mathematical model of calculating oil-water relative permeability of porous reservoirs by resistivity and the relative permeability model of two-phase flow in fractured reservoirs, the classification standards of water-flooded layers suitable for carbonate reservoirs with complex pore structure were established. The results show that the salinity of injected water is the main factor affecting the resistivity of carbonate reservoir. When low salinity water (fresh water) is injected, the relationship curve between resistivity and water saturation is U-shaped. When high salinity water (salt water) is injected, the curve is L-shaped. The classification criteria of water-flooded layers for carbonate reservoirs are as follows: (1) In porous reservoirs, the water cut (fw) is less than or equal to 5% in oil layers, 5%-20% in weak water-flooded layers, 20%-50% in moderately water-flooded layers, and greater than 50% in strong water-flooded layers. (2) For fractured, porous-fractured and composite reservoirs, the oil layers, weakly water-flooded layers, moderately water-flooded layers, and severely water-flooded layers have a water content of less than or equal to 5%, 5% and 10%, 10% to 50%, and larger than 50% respectively.
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