Abstract:Considering the complexity of the fractured reservoir characterization, based on current geological modeling methods and technologies for fractured reservoirs at home and abroad, a four-step geological modeling method is proposed for dual medium reservoirs, that is, a structure model to be used by the matrix system and the fracture system in the first step, petro-physical parameter models for the matrix system in the second step, a geometrical model for the fracture net and then a 3D parameter model in the third step, and a model to be checked with dynamic data in the fourth step. The forecast fracture density is used as a constraint condition for the pre-superimposition seismic inversion, and then, based on the detailed logging data, the special fractured buried hill mutation reservoir of Bohai sea area is analyzed. The 3D distribution of the fractures is forecast according to the interpretation results of the imaging logging, the 3D fracture piece model is visualized, finally the discrete fracture pieces are transformed into 3D continuous quantificational property models. With Jinzhou25-1S oilfield fractured buried hill mutation reservoir as an example, based on the elaborate description of structure, lithology and fractures of the fractured reservoir, the reservoir 3D models of structure, fracture distribution and properties are established by means of such modeling softwares as Fred, Petrel etc and the quantificational characters of the fractured reservoir are described.