CÁLCULO DEL TIEMPO DE TRÁNSITO PROMEDIO DE LA MATRIZ PARA PREDECIR LA POROSIDAD EN FORMACIONES USANDO UN ESTUDIO ESTADÍSTICO MODERADO

Abstract

One of the main problems present in the hydrocarbon industry is the lack of available information necessary to conduct a detailed study of the characteristics of the subsoil, as is the sonic propagation speed, useful for calculating porosity, rock¿s mechanics properties (pore pressure, maximum horizontal stress), elastic properties such as Young¿s modulus, Poisson, Rigidity, Bulk, type of fluid storage, among others. This paper proposes the calculation of average transit time (sonic log) of the matrix to predict formation porosity, from the velocity-porosity relations (Wyllie, Raymer and Raymer-Hunt-Gardner)1, and the Gardner¿s2 equation porosity-density, using data from available records in the well, and modeling results with actual data from the well. The calculation of average transit time for the matrix is obtained from two procedures: A moderate statistical study moderate and the treatment of velocity-porosity Raymer-Hunt-Gardner equation. The calculated average transit time for the array has been validated with an example of field test using different criteria such as: the extrapolation and comparation of information from one well to another well in the same field, the application and comparison of synthetic data with respect to the original well, the detailed study of the applicability of each relationship according to the type of information available, and finally implementing the transit time calculation in the matrix as practical and useful tool to generate porosity curves logs.

Keywords

• logs
• average transit time
• Velocity-Porosity Relations
• Density-Porosity Relations
• Rock Matrix.