Seismic prediction method of multi-scale fracture zone for buried-hill fractured reservoir
The currently fracture prediction methods mainly focus on describing the fracture zone within a specific scale,we develop a new method to predict the multi-scale feature zone of buried-hill fractured reservoir.Firstly,we exploit the post-stack seismic structural attribute and pre-stack AVAz attribute respectively predict the large-scale and middle-scale fracture zone,and use the high-order wavelet transform to get a multi-scale merged attribute as the fracture intensity field.Secondly,we extract the fracture lines from the merged attribute using the Hough transform method,and by using the FMI logs to constrain the orientation of the predicted fracture,we establish a fracture orientation field.Besides,based on the power-law distribution relationship between the length and amount of the fracture,the fractal dimension is estimated.Finally,based on the fracture intensity field,fracture orientation field and fractal dimension,we exploit the distribution function and stochastic process to predict the multi-scale fault zone.The position of fracture zone is constrained by the fracture intensity field and realized by Poisson process.The length of fracture obey exponential distribution and constrained by the fractal dimension.The direction of the fracture is constrained by the fracture orientation field and obey Fisher distribution.The new method is applied in M gas field,Bohai Bay Basin,and the predicted large-scale fracture zone is consistent with the regional reservoir quality,and the middle-scale fracture is consistent with the production test data.The results is used in optimization of the designed development wells,and to some extent confirms the practical significance of the proposed method.
Archean buried hillFracture predictionSeismic multi-scaleFracture zoneAttribute fusionDistribution function
万方数据
维普
