The Research And Application Of Seismic Response Characteristics Of Shale Gas

Seismic exploration has been widely used in shale gas reservoirs. But seismic response characteristics of shale gas field in China is still in the infancy, seismic response characteristics is vague. And because the seismic data is problematic in acquisition time, acquisition methods, acquisition parameters. It lead to low consistency of the seismic data and the effects of seismic attribute predict poor for reservoir.In this thesis, use Chongqing fuling jiaoshiba region and guangxi tiane region as the research object. Analysis and research on seismic response characteristics of shale gas by using numerical simulation of 2D geology-geophysical seismic wave field numerical simulation and 2D seismic attribute technique.Results of research that do simulation of 2D geological and geophysical values show:the migration of longitudinal wave’s velocity can better reflect relationship that is Shale gas content, porosity, TOC with using dlastic wave equation forward modeling; seismic amplitude value is inversely with effective porosity and TOC, is proportional with gas content; comparing the frequency show that the result of low frequency wave forward modeling better fitting effect to Shale gas content, porosity, TOC; the shale of guangxi tiane region mainly distributed in the southwest in the study area, and mainly development in the shale of Devonian, the part of the development in the shale of Permian.Results of research show that the average energy attributes: the average energy, the average absolute amplitude attribute, the average peak amplitude attribute, RMS amplitude attribute, the average instantaneous frequency, frequency, maximum attribute anastomosis is more than 85%, and the average instantaneous frequency properties anastomosis is best to 96.4%; the average absolute amplitude attribute, the average peak amplitude, RMS amplitude attribute, average instantaneous frequency attributes; max value attribute is inverse with gas content in 1.0 the pressure. The greater the attribute value means the lower the gas content. Number of peak attribute is proportional with gas content in 1.0 the pressure. The greater the attribute value means the greater the gas content.The results of the research have a some instructional significance to shale gas seismic response characteristics in China, and the research methods of shale gas seismic response characteristics have some value.