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在测井储层评价中准确识别储层流体性质是其关键.但当储层测井响应特征并不特别明显时,只采用常规测井识别方法不易准确区分气水层.为此,综合运用常规测井和试油资料,选取反映气、水层特点的特征参数建立划分气层、气水同层及水层的模糊综合判别因素,利用Logistic统计法确定隶属函数曲线,即首先以Logistic函数为激活函数,利用模糊统计法确定隶属函数曲线;然后结合权重集建立模糊综合判别模型对流体性质进行模糊判别;最后经检验该方法能较准确的判别出水层、气水同层和气层.
Accurate identification of reservoir fluid properties in logging reservoir evaluation is the key, but it is difficult to distinguish the gas-water layer only by conventional logging identification methods when the logging response characteristics of the reservoir are not obvious. Therefore, Conventional well logging and oil testing data, select the characteristic parameters that reflect the characteristics of gas and water layer to establish the fuzzy comprehensive discrimination factors of gas layer, gas-water layer and water layer, and use Logistic statistical method to determine the membership function curve, that is to say, logistic function As the activation function, the membership function curve is determined by the method of fuzzy statistics. Then the fuzzy synthetic discriminant model is established with the weight set to make a fuzzy judgment of the fluid properties. Finally, the method can accurately identify the water layer, the gas-water layer and the gas layer.