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Introduction of Karst Geological Concept Into the Geological-Simulation Model of Kharyaga Field Carbonate Deposits
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Saint Petersburg 2018, Apr 2018, Volume 2018, p.1 - 6
Abstract
Summary
The paper considers the introduction of karst geological concept into the Kharyaga field geological-simulation model. Two main facies zones have been identified: platform fringe (Barrier zone) and carbonate platform heart (Back-Barrier zone). This paper is dedicated to the Barrier zone, where secondary transformations have evolved significantly: cavernosity, karst cavities and associated fracturing, which have the main impact on the wells’ production. The purpose of this work is to develop a tool for managing and forecasting the Barrier development parameters. The work included the analysis of well data sets, which allowed to identify the highly conductive karst intervals. The subsequent correlation of karst features among the wells showed that there had been several stages of karstification, during which a system of horizontal channels formed on the borderline of sea stand paleo-level. The Barrier reef above the sea paleo-level was subjected to secondary transformations most of all. The conductivity distribution have been introduced into the geological-simulation model by increasing conductivity in the zone of paleo-island evolution and in the faults’ zone. As a result an efficient tool was generated for production planning and optimization. Based on the results of this work, decisions were made on the location of new wells.
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