Abstract: Taking the North Region of Renqiu Ordovician Buried Hill of Raoyang Depression for example, the rock mechanical parameter is defined according to acoustic logging data; the regional boundary loads as unknown condition, the crustal stress of the key well points are taken as constraint conditions, the regional boundary stress is obtained. The geological model, calculation model and mechanical model are established based on it. The distribution rule and characteristic of regional crustal stress are obtained by using simulation in study area. The result shows that the value of crustal stress by numerical simulations is consistent with that of actual measurements. The maximum horizontal principal stress focuses between -61 MPa and -118 MPa in study area, the direction of maximum horizontal principal stress in middle-north part is in west-north, and in south part is in north-south. The minimum horizontal principal stress focuses between -31 MPa and -91 MPa, the direction of minimal horizontal principal stress in north part is in east-north, and in south part is in west-east. Besides, the main crustal stress in the fault zone is smaller than that in continuous strata, the adjacency of fault zone is gradient zone of stresses variation, and the fault zone has an obvious effect on the distribution of horizontal principal stress.

Key words: acoustic logging, crustal stress, buried hill, Ordovician