摘要
本文对滇西北下关地区的地震地质条件和水压致裂应力测量进行了对比分析。认为二者是矛盾的,其原因可能是最小水平主应力的测值偏大。本文依据测量数据和弹性力学理论对测量结果进行了分析,发现该区浅部,垂向主应力是最小主应力,但其随深度增大而增加的速度大于最小水平主应力,400米以下深度,垂向主应力转变为中间主应力。最小水平主应力的实际值可以写为0.85+0.0227H(Mpα),这里H是深度,单位是米。该分析表明,目前水压致裂测得的最小水平主应力的误差要比预料的大。
In this paper, a comparativ analysis has been carried out between celmo-geological condition and hydro-fracturing stress measurement in Xiaguan Region, Northwest Yunnan. It has been found out that they are contradictory to each other, with a reason of probably over-estimated minimum herizontal principal stress measurement.Based on the observational data and elastic dynamic theory the observational result has been analysed. It has been discovered that the vertical principal stress within shallow part of the region is the minimum pricipal stress. But its velocity that increases with depth is larger than the minimum horizontal principal stress. The vertical principal stress turns to be the medial stress when depth is over 400 km. The real value of the minimum horizontal principal stress can be written as 0.85 + 0.227 H (MPa), here H is depth in unit m.The present analysis indicates that errors of the minimum horizontal principal stress obtained from hy.drofracturing measurement are greater than the expected ones.
出处
《地震研究》
CSCD
北大核心
1990年第1期29-39,共11页
Journal of Seismological Research
基金
国家地震局地学基金
