Читать книгу Seismic Reservoir Modeling - Dario Grana - Страница 20

Different probability mass and density functions can be used for discrete and continuous random variables, respectively. For parametric distributions, the function is completely defined by a limited number of parameters (e.g. mean and variance). In this section, we review the most common probability mass and density functions. Probability mass functions are commonly used in geoscience problems for discrete random variables such as facies or rock types, whereas PDFs are used for continuous properties such as porosity, fluid saturations, density, P‐wave and S‐wave velocity. Some applications in earth sciences include mixed discrete–continuous problems with both discrete and continuous random variables.