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我队杉桥勘探区的三迭、侏罗纪的煤层是高灰份,低变质程度的高阻煤层,煤层灰份一般在30—45％之间,而顶、底板岩石和煤层夹石大都是含炭量高的炭质泥岩,二者之间没有明显的物性差异。同时,煤层结构又极其复杂,有时厚度为数十厘米至数米的煤层,由几个至几十个分层组成,煤分层和夹石的厚度最小者仅2厘米左右,一般为0.1至0.5米。而常用的电阻率和伽玛伽玛测井方法,仅能分辨0.2米以上的煤层和夹石,且介面不够清晰。故往往造成很大的解释误差,对煤层难于作出正确的评价。《煤田地质情报》1975年第一期介绍了国外研究复杂煤层的微聚焦电极系测井法。我们引用这一方法,并根
In our team, Sanjian and Jurassic coal seams in the exploration area of Cingsqiao are high-resistant and low-metamorphic high-resistance coal seams with the coal content of 30-45%. Most of the top and bottom plate rock and coal seam Carbonaceous mudstone with high carbon content, there is no obvious physical differences between the two. At the same time, the structure of the coal seam is extremely complicated. Sometimes the coal seam is several tens to several meters in thickness and consists of several to several tens of layers. The minimum thickness of the coal stratification and the gravel is only about 2 centimeters, usually 0.1 to 0.5 meters. The commonly used resistivity and gamma gamma logging methods can only distinguish between coal and rock more than 0.2 meters, and the interface is not clear enough. It often results in a large error of interpretation, it is difficult to make a correct evaluation of the coal seam. Geological Information of Coal Mining, 1975, the first phase introduced the foreign research complex coal seam microfocus electrode system logging method. We cite this method, and root