Method for extracting seismic features and tracing energy ridges in deep fractured-vuggy reservoirs
The Ordovician deep fractured-vuggy reservoirs in Well Fuyuan-1 of the Fuman Oilfield in the Tarim Basin exhibit strong internal reservoir heterogeneity.During the drilling process,drilling fluid leakage mainly occurs in fracture-vuggy reservoirs,while the well sections that are emptied primarily consist of vuggy-cave reser-voirs.It is necessary to spatially characterize fracture and fault systems of different scales with specificity.Therefore,based on previous research,this study uses the heterogeneity and high-energy characteristics of the internal cavities in the strike-slip faults in seismic profiles as a starting point and proposes a method for extrac-ting seismic features and tracking energy ridges in deep fracture-vuggy reservoirs.An improved greedy algo-rithm with azimuth sector constraints is used to track the ridges with heterogeneous energy in fractured-vuggy reservoirs,to identify the features of core band structures or grid-like structures in fracture and fault systems.The specific steps are as follows.① Seismic data preprocessing.Preprocessing is performed based on seismic data,including stratigraphic dip angle scanning and structural layer interpretation.② Heterogeneous energy ridge tracking.Heterogeneous seismic information is extracted to determine the effective root mean square am-plitude attribute range and data truncation based on precise well-seismic calibration results.Hetero-geneous energy ridges are then identified based on threshold truncation tracking data.③ Drilling verification and analysis.Based on the precise calibration results,the correlation between heterogeneous energy ridge data and drilling,logging,and cumulative fluid production data is analyzed to validate the fault identification results at different scales.The application example shows that the identification results of heterogeneous energy ridges in the deep fractured-vuggy reservoirs of Well Fuyuan-1 show a 98.5％match with emptying,mud loss,and other factors,which can effectively reveal the spatial development position of high-quality fractured-vuggy reservoirs and support well deployment.
Well Fuyuan-1deep fractured-vuggy reservoirsgreedy algorithmheterogeneous energy ridges
万方数据
维普
