Sedimentary bottom simulating reflection muting—A new model of hydrate and fluid redistribution from the Pegasus Basin, New Zealand

Bottom simulating reflections (BSRs) interpreted in seismic data are one of the most used indicators for presence gas hydrates. In numerous hydrate provinces, including Hikurangi margin, east New Zealand, distinct and anomalous gaps reflectivity punctuate otherwise continuous BSRs. We undertake a stratigraphic structural interpretation dense grid two-dimensional reflection to investigate possible causes widespread BSR that occur near hinge area synclines. explain these with tectono-sedimentary model where sedimentation into accretionary wedge synclines leads an upward migration base stability respect stratigraphy, causing dissociation hydrates water free gas. A trough-shaped syncline's radially dipping beds promotes along-strata, away from area, incrementally depleting synclinal hinges resulting gap or muted BSR. This may be applicable observed BSRs tectonically active slope basins worldwide.