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本文论述了钻孔崩落椭圆与地应力之间的关系,指出崩落椭圆的形成,是由于孔壁附近应力集中而引起的崩落现象,其长轴方向与最小水平主应力方向相平行。 根据在唐山地区2000—4000米深度范围内的三口石油钻孔中的测量结果,得出钻孔崩落椭圆的平均长轴方向为 N 7°W,由此确定的区域地壳最大水平主应力方向为 N 83°E。 最后,我们把钻孔崩落椭圆的结果同该区的震源机制、地应力解除和水力压裂的结果进行了比较,表明均具有良好的一致性。
This paper discusses the relationship between the cofferdam ecliptic and the earth stress. It is pointed out that the formation of a caking oval is caused by the stress concentration near the pore wall, and its long axis direction is parallel to the direction of the minimum horizontal principal stress. Based on the measurements of three oil bores in the depth of 2000-4000 m in Tangshan area, it is concluded that the direction of the average long axis of the cased hole is N 7 ° W, and the direction of the maximum horizontal principal stress of the crust is N 83 ° E. Finally, we compared the results of the borehole caving ellipse with the focal mechanism, stress relief and hydraulic fracturing results in the area, showing good agreement.