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Estimating Permeability Using a Reservoir Quality Data-set Derived from Drill Cuttings: an Example from Pakistan
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
The studied Cretaceous gas field is located in Pakistan. As part of a greater integrated proof-of-concept and reservoir quality prediction project, part of this project’s scope was to demonstrate the validity of optically-derived permeability estimates from drill cuttings.
The integration and interpretation of core, routine core analysis, petrology and drill cuttings data-sets has identified a set of ‘rules’ to constrain permeability estimates going forward and these are as follows:
≥80% total quartz + coarse clay + grain coating clay + mean GS ≥ 0.3mm = ≥100 mD
≥ 80% total quartz + coarse and/or fine clay ≥ 0.3mm mean GS = 10–100 mD
70–80% total quartz + coarse and/or fine clay + < 0.3mm mean GS = 1–10 mD
70–80% total quartz + fine clay + argillaceous matrix + < 0.3mm mean GS = 0.5–1 mD
<70% total quartz + fine clay + argillaceous matrix < 0.3 mm mean GS = ≤ 0.5 mD
Presence of bioclasts = ≤ 1 mD
Presence of detrital glauconite >8% = ≤ 1 mD
Once constrained by either core-based testing and/or operator experience (microscopic analysis of core and cuttings (MACC) data provides a robust, rock-based data-set that can be used to accurately estimate permeability.