Seismic modeling in the analysis of deep-water sandstone termination styles

  • Bakke K
  • Kane I
  • Martinsen O
 et al. 
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Abstract

Innovative seismic forward modeling is used to illustrate the sensitivity within seismic data, and its application in the inter- pretation of onlap and pinch-out of terminating deep-water sandstones, two critical components in deep-water exploration and production. Sandstone quality, net-to-gross estimates, vol- ume calculations, vertical connectivity, and stratigraphic trap- ping are all dependent on the sandstone extent and their seismic characteristics in these settings. However, seismic resolution is commonly insufficient to resolve the critical reservoir param- eters. Seismicmodeling of termination styles based on integrated outcrop and subsurface properties allows for depth- and resolution-focused predictive models to be built for improved subsurface analysis. This technique is currently underused as a method to better understand the sensitivity of seismic data to the target lithologies and their geometries. TheGrès d’Annot Formation is a well-studied sand-prone deep-water system of Paleogene age, deposited in a bathymetrically complex setting. Six end-member termination styles are discussed, including three sand-prone styles—simple onlap (Os), draping onlap (Od), and bed thickening (Ot)—and three heterolithic styles—advancing pinch-out (Pa), convergent pinch-out (Pc), and convergent thick- ening and pinch-out (Pct). Local thickening close to the system margins is common in both sand-prone and heterolithic termi- nating strata and plays an important function in the appropriate distribution of sandstone. The outcrops are interpreted as po- tential (process) analogs for the complex sandstone distribution and termination patterns observed in plays like the Paleogene of the Gulf ofMexico and the Jurassic of the northern North Sea

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Authors

  • Kristina Bakke

  • Ian A. Kane

  • Ole J. Martinsen

  • Steen A. Petersen

  • Tor A. Johansen

  • Steinar Hustoft

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