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本文叔述了在冀中平原油井水力压裂应力测量原理。通过该地区十口井油井的水力压裂应力测量结果表明,在1500～3200米深度范围内,三个主应力是随深度成线性增加的,它们之间的关系为:S_H>S_V>S。此外,根据在河北省易县的水力压裂应力测量和震源机制解结果,表明该地区的最大水平主应力方向为北东到北东东向。由此证明,冀中平原地区的现代地壳运动是以水平作用为主。同时还表明该地区的四组断裂的活动性质:NE和EW向断裂为引张类型,NNE向断裂为右旋走向滑动类型,NW向断裂为左旋走向滑动类型。
This article sums up the principle of hydraulic fracturing stress measurement in the wells of the Jizhong Plain. The results of hydraulic fracturing stress analysis of 10 oil wells in this area show that the three principal stresses linearly increase with depth within the depth range of 1500 ~ 3200 m, and the relationship between them is: S_H> S_V> S. In addition, based on the results of hydraulic fracturing stress measurement and focal mechanism solution in Yixian, Hebei Province, it is shown that the direction of the maximum horizontal principal stress in this area is from NE to NE. This proves that the modern crustal movement in the Jizhong Plain is mainly horizontal. At the same time, it also shows the active properties of the four faults in the area: the NE and EW faults are of the type of extension, the NNE fault is the dextral strike-slip pattern and the NW strike-slip type is the left-lateral strike-slip pattern.