Identification and interpretation of fractures in high-angle slide fracture body:A case study from Zhenjing Block in the Ordos Basin
Fracture bodies usually develop in the slip fault systems in sedimentary basins,and the fractures have strong concealment,and traditional fracture identification techniques do not perform well.Existing fracture inter-pretation strategies for target layers usually adopt a local view,ignoring the overall characteristics of fracture body fractures.Through the use of the U-ResNet deep learning model,all strata of the Zhenjing Block in Ordos Basin were identified for fractures.Combined with dip-guided seismic attribute slices,the formation mecha-nism,periods and levels of fractures were revealed,and for the first time,the NWW slip distance was estimat-ed.By analyzing the extension characteristics of deep fractures,it was confirmed that the three groups of NWW-oriented slide fractures in the southern part of the block are essentially flower structures,and their rootstock ex-tended to the basal fractures,confirming the reactivation of basal fractures in multiple tectonic movements.The cross-section and plan style of Chang 8 fracture body were divided,and a diamond-pulling rift was identified on the NEE fracture,providing seismic evidence for the NEE fracture slip movement.In addition,three spindle-de-pression fracture combinations were found,explaining the formation reasons of staggered-step faults,and giving the favorable combination style of fracture bodies and their distribution positions on the plane.The study shows that the application of deep learning fracture technology and a full-view interpretation strategy helps to reveal the development characteristics and evolution rules of complex high-angle slip fracture bodies.
NETL
NSTL
万方数据
