Abstract:Sichuan Basin is rich in tight sandstone gas resources, and the recent exploration of channel sandbodies by high-precision 3D data in Jurassic Shaximiao Formation has achieved certain results. Drilling shows that Shaximiao channel sandbody has the characteristics of fast lateral change and strong reservoir heterogeneity. Therefore, improving the boundary recognition and gas-bearing prediction accuracy of channel sandbody is the key to tight gas seismic exploration. By conducting "six division" (divided by type, frequency, time, domain, step, and zone) high-fidelity prestack denoising technology, near-surface Q compensation technology, and OVT domain prestack time migration (PreSTM) technology for AVO feature low frequency protection, sets of processing technology with high fidelity and high resolution was deve-loped for tight gas reservoir of Shaximiao Formation in Sichuan Basin. Meanwhile, the "double bright spot" attribute and multi-wave and multi-component seismic prediction technology are innovated and applied to improve the prediction accuracy of gas-bearing sandbody. The application of this technology series in the tight gas prediction in Central Sichuan has achieved remarkable results, such as expanded frequency band of seismic data, more abundant low-frequency information, significantly improved signal-to-noise ratio, and greatly improved accuracy of channel boundary and gas bearing prediction. In addition, the success rate of new wells has been more than 83%. The achievement strongly supports the increase in storage and production of Shaximiao tight gas in Central Sichuan.
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