1. A computer-based apparatus for creating subsurface models, comprising: a graphical display device; a user input device; (i) means for selecting a region of the world to be modeled; (ii) means for providing geological and geographical data corresponding to said selected region of the world; (iii) means for providing an archive of known geological structures; (iv) means for providing an interface which permits a user to create a subsurface model of the identified region by: (a) selectively viewing a portion of the geographical and/or geophysical data using said graphical display device; (b) selecting a structure from the archive using said user input device; (c) placing the selected structure within the selected region of the world to be modeled and transforming the selected structure in accordance with the geographical or geophysical data; and (d) displaying the selected structure using said graphical display device.