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.