INVERSION OF DYNAMICAL INDICATORS IN QUANTITATIVE BASIN ANALYSIS MODELS .3. MULTIWELL INFORMATION AND 2-DIMENSIONAL CASE-HISTORIES

A dynamical tomography method, which inverts dynamical indicators to e valuate the parameters controlling geological processes as well as tho se in intrinsic equations of state, was introduced into a 2D fluid flo w/compaction model termed GEOPETII (developed at the University of Sou th Carolina), with the assumption of invariance to spatial location of parameters in equations of state, but allowing geologic process param eters to change with well location. Synthetic tests, including sensiti vity analysis, are given to illustrate the operation of the system. Th e nonlinear inverse two-dimensional tomography method, together with a systematic linear search procedure, provides a useful approach to det ermine and constrain the parameters entering quantitative models of dy namical sedimentary evolution. Applying the method to an interpreted s ection from a seismic line in the Navarin Basin, Bering Sea, Alaska, t ile predictions of present-day formation thicknesses, porosity, and fl uid pressure with depth are improved at four controlling well location s (Amoco Mishu No. 1, Exxon Redwood 1, Exxon Redwood 2, and Amoco Dani elle), relative to previous results which used only a forward model. I n this way tile geohistory and structural development of the basin can be defined better, which helps in the reconstruction of thermal histo ry, and so of hydrocarbon generation, migration, and accumulation hist ories in relation to structural and stratigraphic development.