基于连续导电通道计算的低对比度油层评价方法  

Low Contrast Oil Reservoir Evaluation Method Based on Continuous Conductive Channel Calculation

作　　者：张美玲[1] 赵佳慧 熊葵 王双全 ZHANG Meiling;ZHAO Jiahui;XIONG Kui;WANG Shuangquan(School of Earth Sciences,Northeast Petroleum University,Daqing,Heilongjiang 163318,China;Huabei Branch,China National Logging Corporation,Renqiu,Hebei 062552,China)

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]中国石油集团测井有限公司华北分公司,河北任丘062552

出　　处：《测井技术》2025年第1期10-16,30,共8页Well Logging Technology

基　　金：国家自然科学基金项目“基于物模的井震联合反演技术”(41274132);黑龙江省自然科学基金项目“基于数字岩心实验的微观控油电阻率等效模型构建”(LH2020D007)。

摘　　要：低对比度油层解释一直是测井评价难题,而福山凹陷涠洲组高产油层电阻率与水层电阻率相近的情况严重影响了油藏储量计算。黏土阳离子交换模型是一种有效的低电阻率油层评价模型,但难以解释涠洲组黏土类型及其含量均存在较大差别的低电阻率油层。基于电场等效电路原理,构建束缚水连通导电模型,并采用有限元数值技术及欧姆定律计算模型等效电阻率。优选涠洲组物性条件相当、黏土类型差别大的低对比度油层,分别采用阳离子交换模型和束缚水连通导电模型进行计算,发现由束缚水连通导电模型计算的电阻率与实际井测量值吻合更好,能够更有效地解释涠洲组低对比度油层,为涠洲组油藏储量评估提供了可靠依据。束缚水连通导电模型从电场基本理论出发,不受岩层中黏土类型及其分布等复杂微观因素限制,该方法具有普适性和推广价值。The interpretation of low contrast oil layers with low resistivity has always been a difficult problem in well log evaluation.The situation where the resistivity of the high-yield oil layer in the Weizhou formation of the Fushan depression is comparable to that of the water layer seriously affects the calculation of reservoir reserves.The clay cation exchange model is an effective evaluation model for low resistivity oil layers,but it is difficult to explain the significant differences in clay types and contents in low resistivity oil layers of the Weizhou formation.Based on the principle of electric field equivalent circuit,a confined water connected conduction model is constructed,and the equivalent resistivity of the model is calculated using finite element numerical techniques and Ohm's Law.Selecting actual low contrast oil layers with similar physical properties and significant differences in clay types in the Weizhou formation,the cation exchange model and bound water connected conduction model are used for calculation.It is found that the resistivity calculated by the bound water connected conduction model matched better with the actual well measurement values,which could more effectively explain the low contrast oil layers in the Weizhou formation and lay a reliable basis for the reserve evaluation of the Weizhou formation reservoir.The bound water connected conduction model starts from the basic theory of electric fields and is not limited by complex microscopic phenomena such as clay types and their distribution in rock layers.This method has universality and promotional value.

关 键 词：测井 涠洲组 低对比度油层 电阻率 连续导电模型 

分 类 号：P631.84[天文地球—地质矿产勘探]