Based on the regional geological background in the North Yellow Sea Basin and the principle of velocity analysis,we obtained the information of interval velocity,average velocity,sand content,etc,which was used to interpret and calculate the velocity spectrum of the north Yellow Sea basin.

The interval velocity,time-depth conversion and sand content of the Zhongjiannan Basin in the South China Sea are calculated based on interpretation of velocity spectra.

Based on the analysis on seismic attributions,an analysis method of seismic attributes and prediction method of lithologic characters based on a BP artificial neural network were proposed for forecasting the mudstone percentage content of coal roof.

The material source of E 1_3 in Shaxi zone is established by the analysis of such fields as the background of paleogeography and characteristics of the rocks and minerals, the depth, the proportion of sandstone the grain size and the depth of single sand body.

n this paper,the gold or platinum percentage content of alloy gold or platinum detected by method of density are compered with the results detected by chemical analysis and devices.