A master thesis from Aalborg University
Facies and Petrophysical Analysis and Modelling of Sandstone Layers: An Evaluation of the Komso Field
Author(s)
Term
4. term
Education
Publication year
2011
Submitted on
2011-06-06
Pages
114 pages
Abstract
The Komso Field located in the West Siberian basin was examined. The purpose of the project included making zonation, in which reservoir rock was separated from non-reservoir rock. From the six wells that were analysed, multi-well correlation was done between them and next, geological analysis was performed in order to identify the oil and gas-bearing layers. Finally, facies analysis of these layers was done and 3-dimensional modelling carried out so as to model these characteristics obtained. Interactive Petrophysics was first used to find these layers. In total, about 25 layers were found, most of which cut across each of the wells. Facies analysis is important in the investigation of wells and their log information. It revealed that the predominant facies alternated between transgressive and regressive bars between the sandstone units. There were some deviations occurring at certain points, resulting in mouth bars, breaking currents and deltas. Petrel was then used to obtain facies models as well as models of various petrophysical parameters. Correlation and modelling was done for layers cutting across the six wells. Calculations for clay volume, porosity, permeability and water saturation were performed. The clay volume found was less than 0.2 over all the layers. Porosity ranged from 5.9% to 51.6%. Seeing that porosity in general cannot exceed 33.3%, those layers that had higher values are possible overestimations. Permeability ranged between 1 and 15mD. Most of the layers, for each of the wells, had hydrocarbon saturations greater than 55%. The values of the above-calculated parameters suggest that this field is oil-saturated. Keywords: Reservoir areas, Facies analysis, Clay volume, Porosity, Permeability, Water saturation
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