--> Seismic Mega Merger and Subsurface Integration Workflow in the Neuquén Basin, Argentina

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Seismic Mega Merger and Subsurface Integration Workflow in the Neuquén Basin, Argentina

Abstract

Abstract

We have undertaken a multifaceted task of merging a large number of 3D seismic surveys covering the entire Neuquén Basin in Argentina. The current study illustrates the latest geophysical work flow to create the seismic mega merged volume, upon which our geological interpretations are put into local and regional context.

A total of 54 seismic volumes were utilized and merged into one mega merged cube using multi-iteration, least-squares approach to derive a single optimal time and phase shift for each survey. Given the complexities - vintage, age, and acquisition process-, we created a survey that could provide a consistent character match at key marker reflections, and is capable of yielding a better understanding of structural and stratigraphic evolution of the basin, a more integrated architectural fabric, and provide a solid basis for a basin-wide qualitative seismic inversion analysis.

The post merged volume was then used for sequence stratigraphic interpretation within the Vaca Muerta Formation. Eight 3rd order transgressive-regressive cycles were regionally interpreted, including a newly identified one, marking a drastic change in depositional patterns. Isopach maps and 3D amplitude slicing reveal evolving architectural patterns through Vaca Muerta time with a general steepening of depositional slopes, punctuated by some abrupt changes in progradational direction. Selected seismic attributes such as semblance, coherency, and spectral decomposition were generated on the post merged volume which in addition to helping with the stratigraphic interpretation also facilitated delineation of major structural elements of the basin. Of particular interest, was the identification of a more subtle NE trending shear faults and fracture zones in the Vaca Muerta. The microseismic analysis of hydraulic fracture treatments in the Vaca Muerta, suggested these NE trending features have a major influence on the propagation of hydraulic fractures and therefore impacting the stimulated rock volume.

In summary, the mega merged volume provided us with a low cost, balanced 3D dataset, covering the bulk of the basin and supporting our unconventional exploration in the Neuquén Basin