Reservoir assisted history matching method with a covariance localization EnKF using fast marching method

As per the static parameter field information of reservoir geology modeling and the functional equation, FMM is employed to realize the rapid tracking of the pressure wave transmission duration of each well, determine the sensitivity region of an individual well, and build the localized matrix. In combination with the covariance localized EnKF approach, the gradient modification of data assimilation approach is achieved, and the false correlation is decreased. Through progressively matching and renewing the reservoir parametric model, the optimal model is finally obtained.