Shale gas reservoir characterizes source bed being its bearing reservoir, no gaswater interface, low porosity and low permeability. So the exploration and production procedure of shale gas is much different from traditional gas. How to detect the gas content of the shale formation is the key problem to exploit the shale gas. An algorithm to calculate seismic signal spectrum indicated the decay of high frequency is proposed. This algorithm adopt matching pursuit spectrum decomposing method to do high accuracy time frequency analysis on seismic data under the condition that the nonhomogeneity size of geologic body is not much larger than the wavelength of seismic wave and the seismic data is processed with high resolution amplitude maintained method. Do geostatistic analysis on energy ratio of the objective interval which gets from the frequency spectrum of the interval. Then the distribution character of shale gas in the shale reservoir can be got. This technique is an effective geophysical method to identify and evaluate the shale gas reservoir. It can provide critical parameters to explore and develop shale gas. Gas content detection gets effective result by using this technique in Block PengShui of Sichuan Basin.
Geochemical analysis of shale gas reservoir based on well log and 3D seismic data in Pematang formation, Central Sumatera Basin