Study of the method portrayed by a river by calculating the tooth rate of the logging curve

Abstract

In order to accurately describe the reservoir distribution of the oil and gas field, the precision of the portrayal of the channel microfacies is getting higher and higher. Aiming at the existing problems and difficulties in sedimentary microfacies, a method of determining the location of river channels and describing the river channels with high accuracy is proposed by calculating the tooth rate of logging curves. The tooth rate is characterized by the amplitude of the tooth, the density of the tooth and the frequency of the tooth distribution. The general idea is to calculate the three parameters of logging first, and then give each parameter a certain weight coefficient, and get the tooth rate of the curve section of the log. According to the size of the tooth rate, the specific location of the log in the channel is analyzed, and the channel is finely depicted. Compared with the traditional method of sedimentary facies research, the method has improved the accuracy of boundary characterization and achieved semi-quantitative or quantitative accuracy. In the application of sedimentary research of the Hangjinqi area in the Ordos Basin of China, the position of the river is determined by the tooth rate, and the accuracy of the boundary is obviously improved. The research results can be applied directly to the production and guide the optimization of the favorable area and the deployment of the well position. Keywords: Sedimentary microfacies, Logging curve parameters, Tooth rate, Favorable area optimization