Ways to Identify Bypassed Pay From DST Data
& Gas Finding Aspects of Hydrodynamics
1. Introduction and History of the use of Pressure Data in Exploration.
2. Sources of pressures and salinity data
a) DSTs - Drillstem Tests
b) Production Tests
c) RFTs - Wireline Tests
3. Screening the data
4. Using pressure / depth graphs to correlate reservoirs (are zones continuous or separate?)
5. How to predict gas/oil/water contacts downdip from new discovery wells.
6. How to make Potentiometric Surface and Pressure Maps.
7. How to find permeability barriers (Stratigraphic traps) from pressure drops in the reservoir.
8. Identifying areas of updip and downdip flow.
9. Tilled oil/water contacts
10. Capillary pressures
11. Identifying "Flushed" areas
12. Hydrodynamic traps (accumulations without any apparent seal)
13. Causes of Pressure Anomalies - Underpressure and Geopressure.
14. Using chemical water analysis to correlate zones - Stiff Diagrams
15. Effect of hydrodynamics on unconformity type traps
16. Modern Concepts - Pressure Compartments
17. Estimate times of migration from saturation pressures of pools
18. Interating hydrodynamics with differential entrapment/migration pathways
STUDENTS START WITH RAW DATA AND PROGRESS THROUGH ALL STEPS TO COMPLETED MAPS.
1. Defining a Stratigraphic Trap (800 MMBBL Oilfield), North Alberta. A reservoir pressure/continuity map is made to define major sand pinchout edge. Raw pressure/fluid data prior to discovery is used.
2. Identifying Flushed Vs. Prospective Areas in Saskatchewan. Students make regional potentiometric surface maps to define flow direction in Winnipegosis, Midale and other zones.
3. How to Rapidly Assess an Unfamiliar Overseas Basin Using Regional Pressure Maps
4. Finding Giant But Subtle Gas Reserves (B.C.)
© 2009 Hugh W. Reid & Associates Ltd.