基于常规测井资料的礁滩相储层储集类型分类

Identification of Reef Flat Carbonate Reservoir with Conventional Log Data

普光礁滩相碳酸盐岩储层储集空间以孔隙为主,局部发育裂缝;裂缝在常规测井曲线上响应特征非常弱小,裂缝识别困难。储层类型的分类以及按照储集类型选择不同的裂缝识别方法建立礁滩相碳酸盐岩储层解释模型,有望提高裂缝识别率以及储层解释精度。根据孔洞和裂缝的发育情况及其在储集和渗滤中所起的作用,将普光礁滩相碳酸盐岩储层划分为孔洞型、缝洞型(裂缝-孔洞型)、裂缝型与致密型等4种类型。利用常规测井特征以及变换特征,借助支持向量机方法,建立常规测井资料识别储层类型的模型。得到模型参数后对储集类型进行识别,识别结果与成像测井结果吻合。

Reef flat carbonate reservoir is characterized by less fractures and large pores in Puyang Oilfiled. The logging response characteristics of fractures are very poor, and fracture identification is very difficult. Identification of reef flat carbonate reservoir, the used fracture identification method and the interpretation model according to the carbonate reservoir types have improved the rate of fracture identification and the precision of reservoir interpretation. Reef flat carbonate reservoir is classified as four types, i e. , vug type, fracture-vug type, fracture type and tight reservoir type according to the growth degree of vugs and fractures and their effects on reservoir and infiltration. The model of the reservoir identification with conventional log data and transformed features is built based on the support vector machine method. Then, the reservoir types are categorized when the model parameters are obtained. The obtained result agrees well with that of imaging logging.