关键词: 时间域, 全区视电阻率, 水平电场, 两分法, 随机噪声

Abstract: Because the study in line source 1-D forward is few until now,in this paper,all-time apparent resistivity is attained by horizontal component in electrical field.Theoretical calculations indicate that the horizontal electrical field component is one-to-one correspondence with resistivity,which made the definition of all-time apparent resistivity unique and reliable.The paper uses horizontal electrical field component to define the apparent resistivity and calculate with dichotomy.The calculation example shows that the apparent resistivity defined by this method can accurately reflect the information of the model.In the following research,for time domain with line source we found that at near area there are bad results from later period data.Because of the quick electromagnetic wave spread and decay,we have bad results from early stage data in far area also,and the detection depth increases with the transmitter-receiver distance.Finally,we obtain the relationship between maximum detection depth and transmitter-receiver distance by adding 5% random noise and comparing with the theoretical results.

Key words: time domain, all-time apparent resistivity, horizontal electrical field, dichotomy, random noise