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Evaluation of Karst Porosity Morphological Properties through Borehole Image Logs
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 81st EAGE Conference and Exhibition 2019, Jun 2019, Volume 2019, p.1 - 5
Abstract
The representation of Karst petrophysical properties on geological models has been a challenge that, in many aspects, results from the lack of reliable information about the pore network. The full characterization of these structures represents a technological challenge mostly because that both the well logs and the seismic data have limited capability to register their properties. Since image logs currently have the greatest capability of measuring morphological properties of the mega and giga pores, specific techniques were developed in order to evaluate quantitatively these properties.
In order to evaluate morphological properties that are representative of caves, vugs and enlarged fractures at the mega and giga pore scales a set of computational geometry and image processing techniques were used to measure morphological properties such as area, perimeter, longest internal path (LIP), internal length (IL), and structure diameter, among others.
In Atapu field, a Brazilian pre-salt reservoir, this methodology has being used to improve the geological 3D modelling. It is enhancing the knowledge and representability of the karst pore scales and helping to honor the complexity of the structures generated by the karstification processes. Additionally, new workflows are being developed to incorporate the pore diameters in the geological modeling of karstified reservoirs.