Identification and Description of Branch Fracture and Fault-controlled Reservoirs in Shunbei Oilfield
Shunbei oil and gas field is a fault-controlled oil and gas field where many branch faults are difficult to be detected in conventional seismic data at small fracture distance or rel-atively hidden fracture.The unclear morphology and distribution of these fault zones and the unclear characteristics of the broken control collective make it difficult to predict the reser-voir and target selection.To identify and describe this kind of fracture,this study starts with the combinatorial use of multiple methods,and then carry out reservoir prediction and target evaluation,Through repeated tests,the paper finds that the combination of seismic resolution processing and fault enhancement processing can effectively improve the identifica-tion ability of seismic data branch faults;The combination of gradient structure tensor frac-ture detection treatment and maximum likelihood attribute fracture detection treatment can describe and depict the branch faults very well;The combination of structural tensor attrib-ute analysis and seam hole enhancement treatment can depict the cave reservoir effectively;The joint use of GST coherent attribute and discontinuity attribute enables the prediction of hole reservoir;The combination of body curvature and maximum likelihood attribute realizes the prediction and description of the fracture reservoir.A set of technical methods are ex-plored for the identification and description of branch fracture and control reservoirs in Shun-bei oilfield.
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