Abstract: Multi-Well Inversion of Dynamical Indicator Data in a Two-Dimensional Basin Analysis Model: Sensitivity Analysis and Application
Zhihuai Yu, Ian Lerche
A dynamical tomography method, which inverts dynamical indicators to evaluate the parameters controlling geological processes as well as those in intrinsic equations of state, was introduced into the 2-D fluid flow/compaction model GEOPETII (developed at the University of South Carolina), with the assumption of invariance to spatial location of parameters in equations of state, but allowing geologic process parameters, to vary with well location. Synthetic tests, including sensitivity analysis, are given to illustrate the operation of the system. The non-linear inverse two-dimensional tomography method, together with a systematic linear search procedure, provides a very useful approach to-determine and/or constrain the parameters entering quantitative models of dynamic sedimentary evo ution.
Applying the method to an interpreted section from a seismic line in the Navarin basin, Bering Sea, Alaska, the predictions of present day formation thickness, porosity, and fluid pressure with depth are improved at four controlling well locations (Amoco Mishu 1, Exxon Redwood 1, Exxon Redwood 2, and Amoco Danielle), relative to previous results which used only a forward model. In this way the geohistory and structural development of the basin can be defined better, which helps in the reconstruction of thermal history, and so of hydrocarbon generation, migration and accumulation histories in relation to structural and stratigraphic development.
AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994