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This website is for Sonatrach employees who have been on the BP sponsored On-Job Training placement programme and for others who want to know what the programme is all about
Useful Documents Naima's Project Contact Information Your Comments
A spreadsheet which also includes other contact details
Naima was the first On-Job Training Placement candidate with BP. She finished her projects at the BP Research Centre in Sunbury-On-Thames during December 1999. Press on her name underneath the photo above, to send her an email message. Press on her photo to get an enlarged view.
"To Investigate the Impact of Sw on In-Place Reserves Volume Estimation."
The aim of this work is to assess the impact of water
saturation (Sw) uncertainty on in-place reserves volumes
estimation. Teguentor 14 (Teg-14 well) lies towards the middle of
the Teguentor Field, District 3 (Algerian field).
Teg 14 is characterised by tight quartz and porous chlorite
cemented sandstones. Reservoir quality is controlled by the
abundance of chlorite which tends to inhibit quartz overgrowth
and preserve formation quality . The geometric mean horizontal
permeability is about 0.05 mD and the arithmetic mean porosity is
4.4 %.
A model which has been done by Mitchel, Brown and Walder (SCA
9955, 1999) was used to predict water saturation using routine
core data. A good correlation has been obtained between measured
and model water saturation (r2 = 0.885).
The population studied is remote from the free water level and
consequently water saturation is insensitive to the height above
water level. In this instance, routine permeability data were
poor due to the very low absolute values, so the water saturation
model was generated using porosity instead.
Direct water saturation from core using the Dean & Stark
method and water saturation derived from calibrated logs using
Archie parameters were compared to assess the quality of the log
data.
The main conclusions of this work are : sampling procedures at
the rigsite are a very important determinant of data quality and
low porosity causes a systematic uncertainty (overestimation) in
water saturation derived from logs. Water saturation obtained
from cores should always be more accurate than logs for these
types of rocks.
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