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在实验室测量岩心的地层因素及电阻率指数,是电阻率测井解释的一项基础工作。但是,过去采用的“失水法”、“漏斗法”和“气吹法”都有一定的缺点。本文介绍一种新的测量技术,它既可克服上述三种方法的缺点,又可提高测量精度,并简化了测量工作。实验证明,使用这种新技术测量岩心地层因素的相对标准误差和电阻率指数的误差为±6%;对一块岩心进行一个周期的测量可得到地层因素(包括几种不同地层水电阻率对应的地层因素)、电阻率指数曲线及毛细压力曲线。
The measurement of core formation factor and resistivity index in the laboratory is a basic work of resistivity logging interpretation. However, the “water loss method”, “funnel method” and “gas blowing method” adopted in the past all have certain shortcomings. This article describes a new measurement technique that overcomes the shortcomings of the three methods described above, improves measurement accuracy, and simplifies measurement. Experiments show that the error of relative standard error and resistivity index using this new technique to measure core formation factors is ± 6%. One period of core measurement can be used to obtain the formation factors (including the resistivity of several different formation water resistivity Formation factor), resistivity index curve and capillary pressure curve.