放射性测井中Vτ影响理论分析的正演问题

由于放射性测井仪的模拟记录器中使用了RC并联网络,故测井响应受Vτ影响,V为测井速度,τ为RC网络时间常数。以往对Vτ影响的讨论是在考虑单一放射性地层的模型下进行的,认为测井响应（RC网络输出）相对真实地层信号（RC网络输入）存在相位滞后和减幅失真。事实上,井下单一的放射性地层是不存在的,存在的是连续变化的放射性地层剖面。从这一基本事实出发,本文依据随机过程理论导出了测井响应与RC网络输入之间的正演关系,从而发现Vτ影响不仅导致相位滞后和减幅失

DIRECT PROBLEM ON THEORICAL ANALYSIS OF Vτ-INFLUENCE IN RADIOACTIVE LOGGING

Due to the parallel RG network in the analog recording circuit of the radioactive loggingtool, the logging response has Vτ-influence （V--logging speed; τ--time constant of theRC network）. A direct relation between logging response and input of the RC network is derived in this paper. It is found that Vτ-influence causes not only phase hysteresis and amplitude-decreasing distortion, but also amplitude-increasing distortion, and the degree of the amplitude-decreasing distortion is also different from that under considering a single formation.