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利用放射性同位素示踪法确定压裂裂缝形态是矿场常用的一种方法,其不足之处是不能反映出两种裂缝形态的机理特性,对一些薄油层压裂或是垂直裂缝受到限制而不能上下延伸一定高度时,就很难区别裂缝的形态。 根据形成垂直裂缝和水平裂缝两种不同的机理特性所决定的裂缝面延伸方向,以及在常用材料中铅对伽傌射线的强吸收特性,在原放射性同位素示踪法的基础上,采用局部加铅的屏蔽,使放射性同位素示踪曲线能强化方向选择性。这种不同方向有不同强度的示踪测井法,更有利于鉴别裂压后产生的裂缝形态,比常用的简单示踪测井法有明显的优越性,这已得到地面、井下的试验所证实。
The use of radioisotope tracer method to determine fracturing fractures is a commonly used method in mines. The disadvantage of this method is that it can not reflect the mechanical characteristics of the two fractures. For some thin fractures, fractures or vertical fractures are limited but not Extending up and down a certain height, it is difficult to distinguish the form of cracks. According to the direction of fracture plane determined by the formation of vertical and horizontal cracks, and the strong absorption of lead by gamma rays in common materials, based on the original radioisotope tracer method, Shielding enables radioisotopic tracer curves to enhance direction selectivity. This kind of tracing logging method with different intensities in different directions is more conducive to the identification of fractures that occur after the fracturing. It has obvious superiority over the simple tracer logging method, which has been tested by the ground and underground test chambers Confirmed.