Mineral Calculation Method Research Of Element Capture Energy Spectrum Logging

At present,conventional logging projects are difficult to evaluate complex lithologic reservoirs,mainly due to the fact that there is no unique solution for the elements of the mineral,and the type of complex mineral elements is difficult to measure.This article was described the main contents of this article in the order of content.In this paper,based on a large number of domestic and foreign literature research,first of all from the main components of rock and classification,and then briefly introduced the sedimentary rocks,magmatic rocks and these two types of oil exploration closely related to the mineral composition and chemical composition,and then elaborated the measurement principle of ECS.Finally,the least squares method,linear programming method,oxide closed model method and truncated singular value decomposition method are used to establish the appropriate element-mineral conversion relationship.Based on the MATLAB software platform,The results show that the porosity of the formation is calculated by using the element content,and the porosity of the formation is calculated by using the calculated mineral content.Finally,the clay mineral type and content was determined and the analysis of the depositional environment are completed.The results show that the energy content of the rocks can be obtained by using the energy spectrum analysis method of ECS logging,and the mineral composition information can be further obtained based on the relationship between different rock elements and minerals.In the four multi-mineral inversion methods,the least squares method is a method of finding the optimal function relation between the data by finding the sum of the squares of the minimized errors between the unknown data and the actual data.Linear programming method is a mathematical theory and method to study the extreme value problem of linear objective function under linear constraint condition.The oxide closure model is calculated based on the correlation between the elements and minerals obtained by Herron's large number of experiments to calculate the mineral content.Truncated Singular Value Decomposition is a method of determining the optimal truncation parameter using the inflection point of the L curve to accurately solve the mineral content.In these four methods,because the oxide closed model method is calculated by the empirical formula of mineral content,so it has some limitations,the need for the block to the statistical relationship between the amendment.But the other three methods are based on mathematical theory is more accurate description of the element content and mineral content between the conversion relationship.Therefore,the applicability is strong,the application range is very wide,the mineral content calculation can be optimized.The porosity of the rock is calculated by using the skeleton density,and the calculated value agrees well with the true value,and the porosity is calculated accurately.Rate formula and combined with the mineral content to calculate the formation permeability.The results show that the calculated results are in good agreement with the permeability of the core analysis,which provides a new idea for the calculation of permeability.The selection of Schlumberger's Thorium-The method of elemental analysis and mineral analysis is used to discriminate the lithology,which eliminates the error of the traditional lithology identification method due to the muddy content,so that it can make better use of this way to analysis the sedimentary environment.