The overburden failure causes the changes of the constant electric field, and the resistivity is the main parameter in these changes. The experimental simulation about tbe response relation between the overburden fail...The overburden failure causes the changes of the constant electric field, and the resistivity is the main parameter in these changes. The experimental simulation about tbe response relation between the overburden failure and its electrical parameter changes is made by building the similar material physics model of mining. The experiment results are used to analyze and test the in-situ detection. The research indicates that the resistivity changes with the electric characteristic of the rock in cracked zone and caving zone caused by overburden failure, the response characteristics of resistivity vary with the failure degrees at different overburden failure zone and that they are corresponding. The resistivity method used in monitoring the overburden failure can determine the height and the affecting scopes of the cracked zone and caving zone. This can provide reliable techaological guarantee for mining design and safe production.展开更多
In conventional seismic exploration,complex overburden prevents us from imaging the deeper underground structure,because near-surface velocity model cannot be efficiently simplified and accurately established. The vir...In conventional seismic exploration,complex overburden prevents us from imaging the deeper underground structure,because near-surface velocity model cannot be efficiently simplified and accurately established. The virtual source method provides a promising solution,which images below a complex overburden without the knowledge of overburden velocities and near-surface changes. In this paper,the authors simulate the forward modeling under complex overburden with sources on the surface and receivers in the horizontal well,and reset the real sources into the horizontal well using the virtual source method,which subtly avoid the distortion effects of the complex overburden. Finally the underground structure can be imaged using Kirchhoff migration,so the feasibility and advantages of the virtual source method are verified.展开更多
文摘The overburden failure causes the changes of the constant electric field, and the resistivity is the main parameter in these changes. The experimental simulation about tbe response relation between the overburden failure and its electrical parameter changes is made by building the similar material physics model of mining. The experiment results are used to analyze and test the in-situ detection. The research indicates that the resistivity changes with the electric characteristic of the rock in cracked zone and caving zone caused by overburden failure, the response characteristics of resistivity vary with the failure degrees at different overburden failure zone and that they are corresponding. The resistivity method used in monitoring the overburden failure can determine the height and the affecting scopes of the cracked zone and caving zone. This can provide reliable techaological guarantee for mining design and safe production.
文摘In conventional seismic exploration,complex overburden prevents us from imaging the deeper underground structure,because near-surface velocity model cannot be efficiently simplified and accurately established. The virtual source method provides a promising solution,which images below a complex overburden without the knowledge of overburden velocities and near-surface changes. In this paper,the authors simulate the forward modeling under complex overburden with sources on the surface and receivers in the horizontal well,and reset the real sources into the horizontal well using the virtual source method,which subtly avoid the distortion effects of the complex overburden. Finally the underground structure can be imaged using Kirchhoff migration,so the feasibility and advantages of the virtual source method are verified.
