A Study On Metal Ore Seismic Exploration Technology Of Imaging Method

With deep-going of the mineral resources prospecting and exploitation,to search for blindore and deep concealed mineral,traditional metal ore exploration such as electromagneticmethod,excitation polarization and gravity exploration and other geophysical methods can notfully meet the demand for deep mineral exploration, especially to determine mineral-relateddeep structure, so the attention has been paid again on the deep probe and high resolutionseismic method.For a long time, to carry out seismic exploration work in the metal mining area has neverbeen good, in terms of seismic geological conditions, the irregularity of the metal ore bodyand ore body and heterogeneity of surrounding rock medium making the seismic wave fieldvery complex and signal to noise ratio less distinguished. In terms of the methods andtechniques, conventional imaging techniques with low fold number can not meet the demandof result interpretation. Therefore chosen applied research on seismic imaging methods andtechniques in metal mineral area as the main content has great practical significance.In this paper, I analyzed and expounded the methods and techniques of reflection waveand velocity tomography imaging of the complex structure region, established theoreticalmodel of simple and complex structure and rock mass, which based on the actual geologicalstructure and occurrence feature of ore bodies in metal mineral area.Through the full-wavefield forward modeling, reflection imaging processing and the first arrival velocitytomographic inversion, analyzed that the reflected wave field variation and tomographicvelocity field changes have a explicit abnormal reflection on the ore body with a certain scale,rock body and complex structure; For the high fold number actual seismic data of mining area,applied first break and reflected wave information to do volcity tomographic inversion andwave field imaging, combined with ground surveys, drilling geological and rock analysis data,extracted parameter profiles of density and resistivity. After comprehensive result analysis,shallow (600m shallow) abnormal changes of velocity field clearly reveal the changes incharacteristics of the shallow rock, the ore body and stratum structure, while deep speed andwave fields abnormal change more credibly reflect the variation of the deep rock body andstratum structure. The overall results provide a more reliable basis for the distribution and range characteristics of target detection, and the density and resistivity profile informationextracted by inversion volcity field have a certain reference value on identification of theshallow abnormal rock body and properties of ore body.