Fault-fracture sweet spots prediction of tight oil reserviors in Nantun Formation of Wunan Sub-depression in Hailar Basin

To address the challenges of low prediction accuracy for fault-fracture sweet spots and insufficient characterization of fracture-pore coupling in the tight oil reservoirs of Nantun Formation, Wunan Sub-sag, Hailar Basin, this paper proposes a fault-fracture sweet spot prediction technique that integrates eigen-coherence, structure tensor technology and seismic waveform indication inversion. This method generates a sweet spot data volume that comprehensively characterizes fracture-pore coupling features. Sweet spot development zones are identified based on thresholds determined from drilling interpretation results. Practical application shows that the prediction results achieve 80% consistency rate with test data from 100 wells, significantly improving the reliability of sweet spot identification. The sweet spots are mainly distributed in Wudong slope and sub-sag zones, with multiple oil-bearing series vertically superimposed, indicating substantial exploration potential. This technique not only provides effective technical support for the "near-source exploration" strategy in the region but also offers valuable insights for predicting sweet spots in similar complex fault-fracture reservoirs.