河北昌黎台多极距观测数据和地下结构分析

Multiseparation Array Earth Resistivity Observation Data and the Underground Structure of the Changli Station

摘要:

利用河北昌黎台近一年的多极距观测数据，分析各个测道的年变特征，发现随观测极距的增大，各测道年变特征也不尽相同，体现了降雨对年变低点相位的影响随地层深度增加而滞后的特点。同时将多极距观测值与理论值进行对比分析，发现观测误差均小于1，上两层误差略大于下三层。结合该台站最新打井资料，利用电测深数据反演，得到昌黎台新的电性结构模型：h1=2.6 m、ρ1=36.0 Ω·m；h2=14.4 m、ρ2=528.6 Ω·m；h3=75.8 m、ρ3=38.5 Ω·m；h4=∞、ρ4=817.0 Ω·m，与历史文献略有差别。

Abstract:

Using multiseparation apparent resistivity observation data obtained from the Changli station in the recent year, the annual variation characteristics of each observation channel is analyzed. We observe that when distance between the observation channels increases, the annual variation characteristics differ. The observed data is compared with the theoretical value, and the error is less than one; the error of the first and the second layer is larger than that of the subsequent layers. Finally, we combine the inversion observation data with the latest drilling data from the Changli station to develop a new electrical structure model.