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利用钻孔崩落椭圆确定地应力方向,将有可能确定地应力的大小。这种测量深部应力的新方法,目前已受到构造物理学家、地震学家的重视,并正在进行深入的研究。早在七十年代初,cox等人发现,油田中许多钻孔孔壁发生崩落以致形成椭圆形的横截面,其长轴方向与整个油田油井的平均崩落方向一致。对于这种钻孔径向伸长变形的机制曾有过两种不同的认识:(1)破裂交切机制。其主要依据是露头的破裂状况,主张采用外推
Using the borehole caving ellipse to determine the direction of earth stress, it is possible to determine the magnitude of earth stress. This new method of measuring deep stress has now received the attention of structural physicists and seismologists and is undergoing in-depth research. As early as the early 1970s, cox et al. Found that many of the boreholes in the field collapsed to form an oval cross-section whose major axis coincided with the average caverns in the entire field. There have been two different understandings about the mechanism of this kind of radial deformation of drilling: (1) Crack-cutting mechanism. Its main basis is the outcrop rupture, advocating the use of extrapolation