Abstract:

 Threedimensional geological modelling technology based on geostatistics has become a key technology for the fine reservoir description, however, practically a restriction  exists on the density of hard data. The technology tends to be most used for the fine reservoir description in the zone with great  well density. In the exploration block, seismic attribute data are most applied as soft constraints to make up the deficiencies of insufficient information. Based on the research of an offshore oilfield in China, this paper discusses the application of 3D seismic inversion constrained reservoir model in several ways, and provides modeling strategies of “multicondition, multilevel constraint”. Our results demonstrate that the application of multisubject information  including seismic information can efficiently make up the shortcoming of lacking of information between wells, and decreases the uncertainty of geologic models. The established models can integrate the vertical high resolution of wells and horizontal high resolution of seismic data, hence, with this method, 3D stochastic modeling technology can be applied successfully to solve any problems of fine reservoir description during exploration and development.

Key words:  , reservoir modeling； constrained by seismic data； impedence inversion； modelling controlled by facies