Numerical simulation of palaeozoic Tectonic stress field in the Chengdao Area

摘要

Palaeozoic strata in the Chengdao area have abundant oil and gas., In order to reveal the mechanic origin of geological structures, predict still unknown structures and serve oil-gas prospecting, we made numerical simulations for the Indosinian, Yanshan and Himalayan tectonic stress fields of deformed Palaeozoic there by using the plane finite element method. In the Indosinian tectonic stress field there was a SN directional compression to dominate. The distribution of stress values corresponds for two level folds: early folds with NW-SE orientated axes and subsequent folds with nearly EW orientated axes.