Seismic Identification of Strike-Slip Fault Damage Zones Based on Structure Tensor Analysis:A Case Study of Ultra-Deep Carbonate Rocks in Fuman Oilfield
Abundant hydrocarbon resources have been discovered in the ultra-deep Ordovician carbonate strike-slip fault damage zones of the Tarim basin.However,these zones cannot be accurately characterized due to the low resolution of seismic data obtained from the ultra-deep layers,thereby restricting the efficient evaluation and target selection of the strike-slip fault-controlled hydrocarbon reservoirs.Ac-cording to the seismic responses of the strike-slip fault damage zones in the Fuman oilfield,and based on the structure-oriented filtering,the eigenvalues and eigenvectors were calculated by using the structure tensor method,and the projection energy along the fault direction was enhanced by selecting appropriate time windows and stacking vertical thicknesses,which accentuates the strike-slip fault damage zones,enabling a clearer delineation of their boundaries and intensities.The results show that this method provides a clearer depiction of strike-slip fault distribution,allows for the identification of smaller-scale faults,and effectively delineates the width and intensity of ultra-deep carbonate strike-slip fault damage zones,which can be used to evaluate the development degree of the strike-slip fault damage zones.This method can be employed in trap evaluation,well placement,trajectory design,and well monitoring,which will improve drilling success rates and individual well productivity.
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