用云南下关测点的水压致裂结果分析地形起伏对应力测值的影响

本文以云南下关黄草坝的水压致裂应力测量结果为例,讨论了地形起伏对云南区应力测值的影响。结果表明,地形起伏对应力测值的绝对影响随深度的增加衰减缓慢,相对影响急剧减小。100米以内深度的应力测量,地形影响可能给测值带来10%以上的误差。云南区的水压致裂应力测量深达500米,是可以排除掉地形起伏的影响的。

THE EFFECT OF TOPOGRAPHIC RELIEF ON STRESSMEASUREMENTS BY HYDRAULIC-FRACTURINGDATA AT XIAGUAN SITE, YUNNAN

In this paper, the effect of topographic relief on stress measurements in Yunnan has been discussed by taking the result from hydraulic-fracturing stress data at Huangcaoba, Xiaguan, as an example. The obtained results indicate that the absolute effect of topographic relief on stress measurements attenuates gently with the increasing depth, while the relative effect reduces abruptly. For stress measurements within a depth of 100 m, the values have a 10% and more uncertainty due to the topographic effect. The hydraulic-fracturing stress measurements in Yunnan are obtained from a depth as deep as 500m, so that the effect of topographic relief can be eliminated.