Study on modeling method of reef-shoal carbonate reservoir——By taking Tazhong 62 well area as an example

The reservoir heterogeneity of reef-shoal type carbonate rocks is strong, and it is difficult to predict the reef-bank complex reservoirs between wells, and the difficulty on the establishment of geological models is big. According to the characteristics of reef-shoal carbonate reservoir, taking Tazhong 62 well area as an example, the concept of "composite microfacies" is proposed. By using seismic facies interpretation and deterministic modeling method, the "composite microfacies" model is established. Using the "composite microfacies" as control condition, the wave impedance which can reflect the change of reservoir is taken as secondary variable, and the porosity is established by using the method of stochastic modeling model. Because of the great influence of fracture on permeability, the fracture distribution model should be established first, and the permeability model should be established with fracture distribution model as secondary variable, which improves the practicability of permeability model.