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岩性复杂地区是指该地区由多种岩性组成例如灰质砂岩、细砂岩、泥质砂岩、灰质泥岩及泥岩等,这类地层的岩性复杂状况加大了测井解释的难度。针对S油田沙四段岩性复杂特征,在统计5口井测井资料、岩心和薄片分析资料的基础上,以响应特征相似,测井响应上可以识别为原则,通过Fisher判别方法,对该区主要储层岩性进行了分类,进而对岩性复杂地区的岩性识别进行研究分析。以实例解释与岩心资料为依据,采用Fisher判别方法进行岩性识别研究,利用所得判别公式对80个井段预测的岩性与岩心岩性符合率达到88.8%。
Complex lithology refers to the region composed of a variety of lithology, such as gray sandstone, fine sandstone, argillaceous sandstone, gray mudstone and mudstone, lithology complexity of such formations increase the log interpretation of the difficulty. According to the lithologic complex features of Sha 4 Member in S Oilfield, based on the data of well logging, core and thin slice of 5 wells, the response characteristics are similar and the logging response can be identified as principle. By Fisher discriminant method, The lithology of the main reservoirs is classified, and then the lithology identification of complex lithologic areas is studied and analyzed. Based on the example interpretation and core data, the Fisher discriminant method was used to identify the lithology. The coincidence rate of lithology and core lithology predicted by 80 wells was 88.8% using the discriminant formula obtained.