Resolving Carboniferous Stacked Channel Sequences with a Non-linear AVO Technology

Beller, Marc; Doulgeris, P.; Gisolf, A.; Haffinger, P.; Veld, R. Huis in't; Wever, A. K. T.

doi:10.3997/2214-4609.201413300

Proceedings

2015

DOI: 10.3997/2214-4609.201413300

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Resolving Carboniferous Stacked Channel Sequences with a Non-linear AVO Technology

Marc Beller¹,

P. Doulgeris²,

A. Gisolf³

et al.

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The Wingate Field, Blocks 44/23b, 44/24b and 44/19f, UK North Sea

Veld¹,

Schrijver²,

Salzwedel³

2020

Memoirs

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The Wingate gas field was discovered in August 2008 by Wintershall's exploration well 44/24b-7, which targeted a Base Permian closure with subcropping reservoirs of the Late Carboniferous Lower Ketch Formation. Pre-drill, significant upside was identified as a result of ConocoPhillips’ nearby 44/23b-13 well (2006), where the Westoe Coal Formation provides a seat seal to the Lower Ketch Formation. Because of the significant difference in free water level between the two wells, the volumetric uncertainty of undrilled compartments with reservoirs in the Lower Ketch, as well as the Caister Coal Formation, remained relatively high. To manage development risk and uncertainty without further appraisal expenditure, and to allow for early gas production, a phased field development was planned: that is, to appraise through development and production. Gas production, through a six-slot platform and export to the Dutch D15-A platform, commenced in October 2011, only 3 years after discovery. Initial development comprised the tieback of the exploration well and drilling of the second compartment with well 44/24b-A2Y. Subsequently, three more compartments were drilled as soon as production dropped off plateau. During the appraisal/development and 7 years of production, knowledge of the reservoirs increased significantly, improving the understanding of the challenging Westphalian gas play.

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The Wingate Field, Blocks 44/23b, 44/24b and 44/19f, UK North Sea

Veld¹,

Schrijver²,

Salzwedel³

2020

Memoirs

View full text Add to dashboard Cite

show abstract

Reservoir-oriented wave-equation-based seismic amplitude variation with offset inversion

2017

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Wave-equation-based amplitude-variation-with-offset (AVO) inversion solves the full elastic wave equation, for the properties as well as the total wavefield in the object domain, from a set of observations. The relationship between the data and the property set to invert for is essentially nonlinear. This makes wave-equation-based inversion a nonlinear process. One way of visualizing this nonlinearity is by noting that all internal multiple scattering and mode conversions, as well as traveltime differences between the real medium and the background medium, are accounted for by the wave equation. We have developed an iterative solution to this nonlinear inversion problem that seems less likely to be trapped in local minima. The surface recorded data are preconditioned to be more representative for the target interval, by redatuming, or migration. The starting model for the inversion is a very smooth (0–4 Hz) background model constructed from well data. Depending on the data quality, the nonlinear inversion may even update the background model, leading to a broadband solution. Because we are dealing with the elastic wave equation and not a linearized data model in terms of primary reflections, the inversion solves directly for the parameters defining the wave equation: the compressibility (1/bulk modulus) and the shear compliance (1/shear modulus). These parameters are much more directly representative for hydrocarbon saturation, porosity, and lithology, than derived properties such as acoustic and shear impedance that logically follow from the linearized reflectivity model. Because of the strongly nonlinear character of time-lapse effects, wave-equation based AVO inversion is particularly suitable for time-lapse inversion. Our method is presented and illustrated with some synthetic data and three real data case studies.

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Resolving Carboniferous Stacked Channel Sequences with a Non-linear AVO Technology

Cited by 2 publications

References 0 publications

The Wingate Field, Blocks 44/23b, 44/24b and 44/19f, UK North Sea

The Wingate Field, Blocks 44/23b, 44/24b and 44/19f, UK North Sea

Reservoir-oriented wave-equation-based seismic amplitude variation with offset inversion

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