Print this pageAAPG GEO 2010 Middle East
Geoscience Conference & Exhibition
Innovative Geoscience Solutions – Meeting Hydrocarbon Demand in Changing Times
March 7-10, 2010 – Manama, Bahrain
Prediction
of Reservoir Heterogeneity and Quality: Examples and Lessons from Outcrop Analogs from Wajid Sandstone, Saudi Arabia
(1) Earth Sciences, KFUPM, Dhahran, Saudi Arabia.
(2) Earth Sciences, KFUPM, Dhahran, Saudi Arabia.
(3) Schlumberger, Doha, Qatar.
This study tends to characterize the reservoir rock heterogeneity and quality using sedimentological, statistical and geostatistical approaches. Paleozoic fluvial and shallow marine outcrop reservoir analogs from the Wajid Sandstone in south west Saudi Arabia are the target for this study. The impact of depositional and post depositional parameters on porosity and permeability distribution were investigated on macro- to micro-scale. The study revealed wide range of facies, environments, textural and compositional variations at outcrop scale. The porosity and permeability distribution show variability and complex patterns most probably reflecting different scale of depositional and diagenetic influences. The complex relations among parameters may be attributed to variable interrelationships. At the macro to meso-scale these include the meter-scale statigraphic hierarchy, depositional cyclcity and lateral and vertical facies changes. While at micro-scale petrographic features such as grain size, sorting, matrix and cement content and type all seem to be influential. The geostatistical porosity and permeability
models show some agreement and differences which can also be attributed to the aforementioned controlling factors.