Strike-slip deformation characteristics and trap-controlling effects in Shunde north sag
The unclear fault characteristics and trap distribution regularities restrict the exploration of Shunde sag,Pearl River Mouth basin.Shunde sag has undergone multiple stages of tectonic deformation and superposition since the Cenozoic.The formed complex strike-slip deformation controls the formation of traps in the sag.High-precision 3D seismic data,new drilling data,structural explanations,and quantitative analysis technology of strike-slip and extension were used to study the characteristics of strike-slip faults,the structural development mechanism and the controlling effect of strike-slip on traps in Shunde north sag.Results showed that:①Shunde north sag formed 6 fault combinations(negative pattern,compound negative pattern,Y-type,compound Y-type,multi-stage Y-type and domino-type)and 3 plane structural styles(shear lens,plume,and flying geese).②Shunde north sag formed 3 stages of strike-slip.Strike-slip and extension controlled the tectonic evolution of the sag.The fault period is characterized by strong oblique extension and weak strike-slip;the fault-depression transition period is characterized by strong strike-slip and weak extension;the depression period is characterized by weak strike-slip and weak extension.③Shunde north sag developed 3 trap-controlling models:the development depression zone is a strong S-type strike-slip transform zone trap-controlling model;the slope zone is a two-stage strike-slip superimposed trap-controlling model;the low protrusion and weak strike-slip belt is a right-row and left-step strike-slip pushing trap-controlling pattern.The trap formed by the second model is good and is conducive to oil and gas accumulation.This study guides the exploration breakthrough of Shunde north sag.It provides a reference for the tectonic evolution theory and exploration practice under the superposition of multi-stage strike-slip in the edge sag.
Pearl River Mouth basinShunde north sagstrike-slipstrike-slip intensitystructural styletrap formation
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