关键词: 页岩气, 成藏条件, 资源量, 水力压裂

Abstract:

This paper analyzed the applicability of the seismic wave pre-stack reverse-time migration technology on the migration of data from different seismic observation models, such as surface seismic, borehole seismic and cross well seismic. Taking velocity model with different dip angle and Marmousi velocity model as examples, we synthesized several common shot gathers corresponding to observation models, and carried out numerical experiments on reverse time migration further. The results show that the reverse-time migration method is suitable for these seismic observation models, and can get perfect imaging results; the S/N ratio can be further improved by low-frequency noise suppression method. The direct wave and refracted wave of the surface seismic observation model must be finely cut, and the first arrival wave field （down propagating direct wave） must be preserved of the borehole seismic and cross well seismic observation model. In this way, the wave field energy transformation relation between the reflection and transmission can be remained unchanged, and it can depict detailed features the geological structure to a maximum extent.

Key words: shale gas, accumulation conditions, resources, hydraulic fracturing