--> --> Fault History Diagrams: Rapid Analysis of Temporal Variations in Fault Throw and Lithological Juxtaposition
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Previous HitFaultNext Hit History Diagrams: Rapid Analysis of Temporal Variations in Previous HitFaultNext Hit Throw and Lithological Juxtaposition

Abstract

Two-dimensional Previous HitfaultNext Hit strike-projections allow rapid visualization of Previous HitfaultNext Hit throw or across-Previous HitfaultNext Hit lithological juxtaposition (Allan diagrams). Strike-projections are constructed by projecting hanging wall and footwall cut-off lines onto a vertical plane oriented parallel to the average strike of the Previous HitfaultNext Hit surface. Throw is calculated from the vertical separation of the cut-off lines and interpolated across the diagram. Lithological juxtapositions of hanging wall and footwall stratigraphies, for example sand/sand overlap, are derived from the across-Previous HitfaultNext Hit relationships of the cut-off lines. More detailed lithological variations, and thus juxtapositions, can be obtained by projecting Vshale values onto the diagram from proximal well data. Structural restoration techniques are incorporated into strike-projections to construct 2D “Previous HitfaultNext Hit history” diagrams, which allow the temporal development of throw and juxtapositions to be quickly analysed. At each horizon time-step, the effects of physical compaction are restored using industry-standard compaction curves, and throw is restored to the footwall cut-off line. Whilst Previous HitfaultNext Hit history diagrams represent an approximation of a 3D surface, the method provides initial insight into the temporal change in Previous HitfaultNext Hit properties ahead of a full 3D restoration. The diagrams can, therefore, save time and costs associated with further, more in-depth analyses. In this work, Previous HitfaultNext Hit history diagrams are used to analyse the development of the Cape Egmont Previous HitFaultNext Hit, located in the Taranaki Basin, offshore New Zealand. The structure, a regional scale normal Previous HitfaultNext Hit, is a proposed flow pathway for the charge of the adjacent Maui gas condensate field. The results indicate that the Cape Egmont Previous HitFaultNext Hit is currently a baffle to across-Previous HitfaultNext Hit flow, but sand/sand juxtapositions were present across the Previous HitfaultTop up until ca. 3.5 Ma before present-day.