Application of Pseudo Three—dimensional Resistivity Tomography Technology in Coal Mine Goaf Exploration
The traditional two-dimensional DC resistivity imaging method has limitations in complex geological structures exploration,which is unable to accurately restore the three-di-mensional underground electrical structure.When applied to the relatively largesurvey area,the true three-dimensional DC resistivity exploration requires one-time electrodes layout,which is basically not feasible due to hardware,cost and other factors.In this paper,taking the exploration of the goaf in Shagang coal mine on Xiangfan-Jingzhou railway as an exam-ple,a pseudo-3D exploration scheme with two-dimensional multi-section cross wiring is de-signed,and the conventional multi-electrode electrical equipment is used for field data acqui-sition.The high-precision 3D electrical structure of the stratum in the work area and the goaf in the small coal mine is obtained by the 3D resistivity imaging algorithm based on octree grid division.Compared with the regional geological data and drilling results,the abnormal dis-tribution characteristics of high conductivity in the work area can well reflect the spatial dis-tribution characteristics of the stratum boundary in the work area and the goaf in the old coal mine.The results application shows that the three-dimensional resistivity exploration meth-od based on pseudo-three-dimensional acquisition method can effectively identify the geolog-ical anomaly information and exploration targets with connectivity characteristics,and has good imaging accuracy and practicability,which has practical significance for breaking through the limitations of two-dimensional imaging and popularizing the three-dimensional resistivity exploration,and has broad application prospects in the field of near-surface unfa-vorable geological exploration.
NETL
NSTL
万方数据
维普
