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工作频率为1.1GHz的微波测井仪测量衰减值曲线,在含淡水泥浆的井中,对砂泥岩剖面观察到SP曲线和自然伽马测井曲线与电磁波传播测井测出的衰减值曲线有很好的对比关系,对有淡水泥浆滤液侵入的纯渗透性地层显示低衰减值,但在泥岩层显示很大衰减的原因还不清楚。关于在频率为1.1GHz泥岩衰减很大的一种可能的解释是,在容易发生离子交换的泥岩表面上,弛豫效应引起介电损耗,衰减主要决定于电导率和介电损耗,本文的目的是要证明衰减与电导率和介电损耗有某种比例关系。根据粘土表面容易发生离子交换位置的数量来确定CEC,如果这个概念正确,把介电损耗引起的衰减值除以体积密度,则CEC与衰减值之间可能有线性关系。在一淡水泥浆井中的实例证明上述概念是正确的。
The attenuation curve was measured with a microwave logging tool operating at 1.1 GHz. In a well containing freshwater slurry, the curves of sp curves and natural gamma logging curves and attenuation curves measured by electromagnetic wave propagation logs were well observed for sand-shale sections In good contrast, purely permeable formations with freshwater filtrate infiltration show low attenuation values, but the reasons for the great attenuation in mudstone formations are unclear. One possible explanation for the large attenuation of mudstone at a frequency of 1.1 GHz is that relaxation effects cause dielectric losses on the surface of mudstone prone to ion exchange, the decay mainly due to the conductivity and dielectric loss, To prove that the attenuation and the conductivity and dielectric loss have a certain proportion. The CEC is determined from the number of ion exchange sites on the surface of the clay, and if this concept is correct, dividing the attenuation due to dielectric loss by the bulk density may have a linear relationship between the CEC and the attenuation. The example in a freshwater mud shaft proved that the above concept is correct.