Partial differential equation models of some oil reservoir systems can be transformed

such as well test interpretation

into series composed of nonlinear function terms.Every term is complex nonlinear function of stratigraphic parameters θ.Stratigraphic parameters are the foundation of well test interpretation

so their global optimal estimate values must be sought.And the problem beoames more difficult because aforesaid functions are multimodal functions and very sensitive in extreme point about the change o...