測量速度与积分电路时間常数的乘积（υ×τ）对自然伽（亻马）測井曲线的影响

一、引言目前,在勘探和开发放射性矿床、石油和其它有用矿藏的工作中,已广泛地应用自然伽（亻馬）測井。一般地說,在这些工作中,不仅需要根据自然伽（亻馬）測井曲线确定目的层的厚度及深度,而且在确定矿层的放射性元素合量、貯油层的合泥量与渗透率等工作中,还必須根据自然伽（亻馬）測井曲綫确定代表地层放射性的真正曲线幅度值。

EFFECT OF THE PRODUCT OF LOGGING SPEED AND THE TIME CONSTANT OF THE INTEGRATING CIRCUIT（ν×τ） ON THE RADIOACTIVE WELL-LOGGING CURVES

In determining the thickness, depth of a rock layer and also the true amplitude values of a radioactive logging curve directly from the measured curve, it is always necessary to correct for the error arising from the effect of the product of logging speed and the time constant of the integrating circuit ν×τ. The existing method and principle of making such correction have serious defects. The present work provides a method for examining the effect of ν×τ, and to compute theoretically the radioactive logging curves by means of Fourier series. Computations were done respectively for a point counter tube and a НГГК-55 type well-logging equipment commonly used in our petroleum industry. A set of curves has been drawn and they are compared with the theoretical curves computed without taking into consideration of the effect of ν×τ. Correction curves are then available. However, they still remain to be theoretical results, not yet being tested experimentally or examined in practical radioactive well-logging work.