综合地球物理测井技术在滇中引水隧洞工程勘察中的应用

为判定滇中引水隧洞工程勘察钻孔内岩体完整性,采用将声波测井与钻孔成像相结合的综合地球物理测井技术对钻孔情况进行综合分析判断。阐述了声波测井与钻孔成像测井的方法原理及特点,根据钻孔ZGZK2和XLZK7的声波测井曲线的波速跳跃剧烈程度和钻孔成像的节理裂隙发育特性(方位、倾角和发育密度等)等信息,给出了钻孔内较为准确可靠的岩体完整情况。针对2种测井方法对判定岩体完整性提供参数的侧重点不同,对比分析了声波测井与钻孔成像测试结果对判定节理裂隙发育程度的差异,通过对比分析有助于提高单一测井方法对钻孔内岩体地质情况判定的全面性和精确性,实践证明综合地球物理测井技术在进行深部岩体勘察具有很好的效果,可为指导工程施工提供依据。

Application of Comprehensive Geophysical Well Logging Technology to the Engineering Exploration of Water Diversion Tunnel in Central Yunnan

The integrity of rock from borehole of engineering investigation of the water diversion tunnel in CentralYunnan province is comprehensively ascertained and analyzed by the combination of acoustic logging and borehole imaging. The principles and the features of acoustic logging and borehole imaging are expounded. Furthermore, accurate and reliable rock integrity information is given according to the acoustic velocity jumping intensity of acoustic logging curve and the fracture characteristics (position, inclination and development intensity) of borehole imaging for borehole ZGZK2 and borehole XLZK7. The emphasis of rock integrity parameters obtained by acoustic logging differs from those by borehole imaging, in view of this, differences in the results of fracture development by the two methods are compared and analyzed, which is beneficial to improving comprehensive and accurate rock integrity assessment for a single logging method. Practices prove that the comprehensive geophysical well logging technology has good efficiency in deep rock exploration.