Fracture Characteristics and Seismic Prediction of Z4 Metamorphic Buried-Hill Reservoir
Seismic prediction of fractures is the foundation of fractured reservoir evaluation.Metamorphic buried-hill reservoirs exhib-it diverse fracture types,significant variations in fracture development at different reservoir parts,and difficulties in describing frac-ture heterogeneity.The Z4 metamorphic buried-hill reservoir was investigated for its fracture characteristics and seismic prediction.The development of fractures in the Z4 reservoir has layering characteristics and can be divided into four sections such as weathered-semi-filled fractures at the top,highly developed net-like fractures in the upper part,moderately developed low-angle fractures in the middle part,and poorly developed high-angle fractures at the bottom.A comprehensive fracture prediction technique was proposed,which integrates multi-scale general spectral decomposition,dip-oriented eigenvalue coherent processing,and iterative ant analysis.The fracture orientations and development revealed by cores were compared with the results of seismic prediction,suggesting a high consistency.It is believed that the multi-approach comprehensive fracture seismic prediction technology proposed in this study has high accuracy.
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