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以饶阳凹陷任北奥陶系潜山为例,基于声波测井资料确定了岩石力学参数,视区域边界荷载为未知数,目标井地应力为约束,求解得出区域所受边界力;据此建立地质模型、计算模型、力学模型,对研究区的地应力进行了数值模拟,得出该区域地应力的分布规律及特点。研究结果表明,通过数值模拟求得的地应力值与实际测量地应力值吻合较好;研究区水平最大主应力值主要集中在-61～-118 MPa,水平最大主应力方向中北部为北西方向,南部为近南北方向;最小水平主应力值主要集中在-31～-91 MPa,北部最小应力值方向为北东方向,南部为近东西方向。断裂带附近是应力变化的梯度带,断裂带内主应力值较连续地层小,断层对水平主应力的分布具有显著影响。
Taking the Ordovician buried hill in Renyang Sag as an example, the rock mechanics parameters were determined based on the acoustic logging data. The boundary load was assumed to be unknown and the stress in the target well was constrained to obtain the boundary force. Based on this, Geological model, calculation model and mechanical model, the numerical simulation of the geostress in the study area is carried out, and the distribution and characteristics of the geostress in this area are obtained. The results show that the value of in-situ stress obtained by numerical simulation is in good agreement with the measured value of in-situ stress. The maximum principal stress of the study area mainly lies in the range of -61 to -118 MPa. The direction of the maximum horizontal principal stress is northwest While the southern part is nearly north-south direction. The minimum horizontal principal stress mainly lies in the range of -31 ~ -91 MPa. The minimum stress value in the north is the northeast direction and the south is the near east-west direction. The vicinity of the fault zone is a gradient zone of stress variation. The principal stress values in the fault zone are smaller than those in the continuous zone, and the faults have a significant effect on the distribution of the horizontal principal stress.