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Vol. 4 (2001 year), No. 1

Madatov A.G., Sereda V.-A.I.
The decomposition of 3-d overpressure evolution model in basin scale and its application to the fault seal analysis

A new 3-D fluid dynamics model of multilayered media has been developed, with complex burial history and capable for calibration. This new method extends the 1.5-D approach to the solution of forward and inverse problems for excess formation pressure evolution at the basin scale, earlier proposed by the authors. The concept of a laterally conductive reservoir carrier among massive permeable rocks has been introduced. The system of sealing faults has been considered as pressure barriers in the relevant lateral drainage system. The vertical and lateral directions of pore fluid migration have been accounted recursively in two relevant mass conservation models. It allows building of an effective numerical scheme capable of modelling formation pressure compartmentalization and calibrating the sealing properties of surrounding faults. We introduce as a goal of calibration the set of independent fault attributes sensitive to the seal properties and sufficient to describe the lateral barrier. A software program package based on this approach has been developed, and some results of its practical application for fault analysis in the North Sea basin have been discussed.

(in English, стр.18, fig. 13, tables. 2, ref 33, MS Word 95, MS Word 95 232 Kb)

Vol. 6 (2003 year), No. 1

Madatov A.G. and Sereda V.-A.I.
Upscaling of a basin model required for pore pressure prediction before and during drilling

A new approach to the basin model upscaling for drilling applications has been described. The approach is based on the composite 3D model of the fluid dynamics in basin time scale. The system analysis and inversion theory have been involved. The work flow of consequent data and model processing has been considering phase by phase. The consequence starts at the 3D seismic data cube where the potential basin model could have M*106 cells to be specified and finishes at the upscaled Earth model given on N*102 cells of optimised non-regular grid. The routine is designated to keep prediction quality at given level at any stage of upscaling. The final Earth model is fully prepared for real time calibration of relevant Earth model and pore pressure prediction / updating of prediction while drilling. The details of the model description and non-local sensitivity analysis have been given in two appendices.

(in Russian, стр.26, fig. 7, tables. 1, ref 35, MS Word 95, MS Word 95 940 Kb)