摘要
探讨了γ射线测井信号数字滤波效果的评价方法,指出评价数字滤波效果的判别准则,应包括恢复地层真值的效果评价和跟踪地层突变能力的评价两个方面。通过定义地层真值逼近指标RVI,评价数字滤波恢复地层真值的效果,认为均方根误差优于可能误差,建议采用均方根误差(RMSE)评价数字滤波的降噪效果。为了实时检测地层突变,提出了计数率变化指标VICR和测量点的计数率实时隶属度SICR两个概念;为了评价不同滤波方法跟踪地层突变的能力,提出了跟踪地层突变的评价指标SFI。为了便于应用,将RVI、RMSE、SFI综合成统一的指标CEI,并给出了评价实例。
The evaluation methods for digital filtering effects used in Gamma ray logging are discussed.The criteria used to evaluate digital filtering effects should include two aspects named as effect evaluation of regaining real formation value and scouting formation discontinuity.A new index named as RVI is presented to evaluate the effect of regaining real formation value.The root mean square error(RMSE)is recommended to use to evaluate noise reducing effect based on the fact that the RMSE is superior to possible error.Two kinds of criteria named as varying index of count rate(VICR)and subject index of count rate(SICR)are presented in order to scout formation discontinuity in real time.A new index named as SFI is presented in order to evaluate the ability of scouting formation discontinuity of different filtering methods.RVI,RMSE and SFI are integrated as a new index named as CEI in order to use them conveniently,and the evaluating example is given out in the end.
出处
《石油仪器》
2007年第6期40-43,100-101,共4页
Petroleum Instruments
关键词
γ射线测井信号
滤波
地层真值
地层突变
评价
Gamma ray logging signal
filter
formation truth
formation discontinuity
Evaluating method
