Multi-parameter constrained high-resolution inversion method driven by waveform: A case study of Longmaxi Formation shale gas in western Chongqing, Sichuan Basin
GU Wen1,2, YIN Xingyao1, WU Furong2, LI Kun1, ZHAI Haojie3
1. School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266555, China;
2. BGP Inc., CNPC, Zhuozhou, Hebei 072750, China;
3. ZHLH Petroleum Technology Research Institute, Beijing 100102, China
Abstract:The post-stack seismic waveform indication inversion shows advantages in thin reservoir prediction, and pre-stack elastic parameters have more information and are more sensitive to reservoirs than post-stack elastic parameters. Taking advantage of them, this paper applies the high-precision pre-stack stochastic inversion method under seismic drive and reservoir configuration constraint to quantitatively characterize high-quality thin shale reservoirs with petrophysical data in hope of providing technical support for the prediction of geological sweet spots of deep shale gas. Firstly, the three-variable optimization method based on gather waveform similarity, AVO feature and spatial distance is employed to extract wells with similar structures as spatial estimation samples, and then the initial model of the to-be-discriminated gather is established. Secondly, with the statistical elastic impedance as the prior information, the pre-stack seismic waveform indication inversion is performed with "Markov chain Monte Carlo stochastic simulation algorithm based on the pre-stack gather feature indication." Finally, a high-precision inversion result is obtained with pre-stack elastic parameters. The practical application demonstrates that this method effectively simulates the thickness of high-quality shale in 1-2 layer in the first sub-member of the first member of Longmaxi Formation, and accurately simulated the geological sweet spot parameter therein on the basis of the high-frequency well-seismic simulation of the characteristic parameters. This research provides technical support for shale gas exploration.
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