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新第三纪的褐煤成煤时代年轻,是变质程度低,围岩固结程度也较低呈半胶结的松散状,实际工作中由于煤层结构复杂,煤与围岩物性差异小,感到有划分煤层结构物性参数不够用的问题。在利用已有的设备的情况下,自己动手制作电桥盒、下井电极系,独创了办法土但能解决实际问题的简单、实用的屏蔽接地电阻梯度测井方法。经过试验,结合人工伽玛、自然伽玛、视电阻率电位等测井方法,进行对比、验证,证明此方法能有效地解决低变质复杂结构褐煤层结构划分的问题。不仅为煤层结构划分增加了一种有效的参数,而且由于解释点为曲线的极值点,划分厚度也更加准确。由于使用了屏蔽接地电阻梯度测井方法,使得在实际工作中的测井甲级孔率达到了100%。
The Neogene of the lignite coal age is young, is a low degree of metamorphism, surrounding rock consolidation is also a semi-cemented loose form loose, the actual work due to the complex coal seam, coal and surrounding rock physical differences are small, there is a division The problem of insufficient physical parameters of coal seam structure. In the case of using existing equipment, we make our own bridge box and downhole electrode system and created a simple and practical shield grounding gradient logging method that can solve practical problems. After testing, combined with artificial gamma ray, gamma ray and apparent resistivity potentials logging and other logging methods, the comparison and verification show that this method can effectively solve the problem of low-metamorphic complex structure of lignite. It not only adds an effective parameter for the division of coal seam structure, but also divides the thickness more accurately because the interpretation point is the extreme point of the curve. Due to the use of shielded grounding resistance gradient logging method, the logging grade A hole rate reached 100% in actual work.