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Transformation and Interpretation of Previous HitSeismicNext Hit Previous HitDataNext Hit in the Wheeler Domain: Principles and Case Study Examples

Friso Brouwer, David Connolly, Gert de Bruin, and Paul de Groot
dGB-USA, Sugar Land, TX

Previous HitSeismicNext Hit Previous HitdataNext Hit is one of the important sources of sequence stratigraphic information. Despite (or due to) the richness of sequence stratigraphic information in Previous HitseismicNext Hit Previous HitdataNext Hit it is difficult to isolate, map, and interpret system tracts in 3D Previous HitseismicNext Hit Previous HitdataNext Hit. However, once mapped in a Wheeler diagram, interpretation of system tracts, sea level change and shoreline shifts becomes much easier, ultimately facilitating the identification of source rock, reservoir-seal-couplets and stratigraphic traps.

We will present a workflow illustrated with case study examples in which we semi-automatic construct a Wheeler type diagram from Previous HitseismicNext Hit Previous HitdataNext Hit and use a dual Previous HitseismicNext Hit/wheeler Previous HitdisplayNext Hit for system tract interpretation. Finally, we show how detailed stratigraphic features such as channels and fans can be mapped with ease in 3D wheeler space.

The procedure depends on the accurate determination of the dip of Previous HitseismicNext Hit events, using a method called dip-steering. Subsequent step is the automated Previous HitdataNext Hit driven tracking of chrono-stratigraphic horizons using the calculated dips from the previous step. The tracking is designed to honor horizon truncations at unconformable boundaries. Using the chrono-stratigraphy we transform the Previous HitdataNext Hit from the Previous HitseismicNext Hit domain to the Wheeler domain, including creation of hiatuses in areas of non-deposition and erosion. A simultaneous Previous HitdisplayNext Hit of amplitude Previous HitdataNext Hit (Previous HitseismicNext Hit character) and chrono-stratigraphy in the Previous HitseismicNext Hit domain and depositional trends in the wheeler domain allows an easy and accurate interpretation of the system tracts and depositional style.

Using the information obtained in the previous step we build a 3D model-driven chrono-stratigraphy, again honoring unconformities. We use this to create a 3D wheeler space, in which time slices are equivalent to horizons slices in the Previous HitseismicTop domain.

 

AAPG Search and Discover Article #90078©2008 AAPG Annual Convention, San Antonio, Texas