Abstract
Unconventional reservoirs, such as tight gas sand, coal‐bed methane and shale gas reservoirs will play an important role in stable domestic nature gas production in China during the next decade. The complex geological conditions and drilling risks are the major difficulties to the successful development of these resources. Integration of multi‐discipline analysis including geophysics, rock physics and geology will help to reduce the costs. We present a multistage, target oriented prestack full waveform inversion procedure to estimate tight gas sand in Xujiahe Formation in the northeast Sichuan basin, taking account of prior information from well log data and some basic geological knowledge. Spatial distributions of tight gas sand estimated from the final inverted elastic models are consistent with current well interpretation and gas production test results. The study results indicate that the multi‐stage prestack full waveform inversion strategy is practical for tight gas sand detection in this region.
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