In settings characterized by erosional features and sediment infill, mapping unconformities, or sequence boundaries at intra-reservoir levels is the key to building accurate reservoir models. In many such cases, unconformities can be picked reliably in wells. However, correlating these markers from well-to-well on seismic data is challenging. Conventional horizon auto-trackers cannot be used because the seismic response along unconformable events varies laterally. In some cases unconformities can be drawn manually but this is a time-consuming task that, at best, generates inaccurate surfaces. As the complexity of reservoir architecture increases manual drawing becomes more challenging and practically impossible.

In this paper we present a study performed on the Nelson Field as an example of a new method for correlating wells at intra-reservoir levels on seismic data. We use an inversion-based algorithm to create a dense set of horizons that fits exactly at important well markers. The method consists of two steps:

  1. With the help of an “unconformity tracker” a set of intra-reservoir framework horizons are produced, which fully honour the well markers.
  2. Using a similar inversion-based algorithm a dense set of horizons is created in between the framework horizons.

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  1. Gill, C.E. and Shepherd, M.
    (2010) Locating the remaining oil in the Nelson Field. in Vining, B.A. and Pickering, S. C. (eds) Petroleum Geology: From Mature Basins to New Frontiers – Proceedings of the 7th Petroleum Geology Conference, 349–368. DOI: 10.1144/0070349# Petroleum Geology Conferences Ltd. Published by the Geological Society, London.
    https://doi.org/10.1144/0070349 [Google Scholar]
  2. SimonLuo and DaveHale
    (2011) Non-vertical deformations for seismic image flattening. SEG Technical Program Expanded Abstracts 2011: pp. 970–974.
    [Google Scholar]
  3. Wu, X. and Hale, D.
    , 2014. Horizon volumes with interpreted constraints. 84th Annual Meeting of the Society of Exploration Geophysics, Expanded Abstracts.
    [Google Scholar]

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