The main oil-layer group ZH3 Ⅱ in oilfield W,the South China Sea,is located in a weak-reflection area.How to image and identify multi-scale faults of weak responses is crucial to the evaluation of producing reserves and development planning.As low-frequency signals indicate stratigraphic framework,a target-oriented processing workflow is proposed to improve data quality and enhance low-frequency signals for major fault identification.Accurate major fault identification is instructive to regional fault inter-pretation.Based on phase sensitivity to the change of formation occurrence,phase-indicated coherence is formulated to improve mi-nor fault detection after linear separation and denoising for major fault-surface reflections as well as phase selection.This type of coherence is better than eigenvalue coherence in spatially identifying those faults with small vertical fault distance.The application of multi-scale fault imaging and identification method to oilfield W in the South China Sea shows greatly improved accuracy of fault detection in the weak-reflection area.Research results offer technical support to the evaluation of producing reserves and develop-ment planning in the oilfield.
area with weak seismic reflectionscomplicated faultdominant imagingcoherenceminor fault
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