NUMERICAL SIMULATION OF MIOCENE EPOCH TECTONIC STRESS FIELD AND PREDICTION OF FAVORABLE PLACE FOR PETROLEUM ACCUMULATION IN THE XIHU DEPRESSION, DONGHAI

According to predecessors geological research results and actual data,using geomechanics opinion,combined with its structrual deformation character,the boundary condition and stress acting behaviors of the Xihu depression were analyzed in the Miocene epoch.Its geological model was described by paleostructure map and rock mechanics parameters,and the tectonic stress field in the Miocene was modelled by elastic mechanics model and finite-element method for plane stress.The favorable positions for hydrocarbon accumulation were predicted in accordance with the modelling results.