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AAPG Bulletin, Vol. 90 (2006), Program Abstracts (Digital)

7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006

ABSTRACT: The Rosetta Stone Project – II: Spectral Analysis of the Previous HitPoreNext Hit Geometries and Their Relationships to Reservoir Properties for the Arab D Limestones

Edward A. Clerke
Saudi Aramco, Box 10607, Dhahran 31311 Saudi Arabia, phone: 966 3 874 5176, edward.clerke@aramco.com

The Rosetta Stone project was launched in 2001, to acquire a much more extensive data set from 10 cored wells and containing: geological, petrophysical and reservoir property data.

Four porositons (distinct and separable Previous HitporeNext Hit-throat size distribution modes) are the fundamental building blocks of the Arab- D limestone Previous HitporeNext Hit Previous HitsystemsNext Hit. The “M” porositon (macroporosity) carries 99.98% of the permeability of the multimodal Previous HitporeNext Hit Previous HitsystemsNext Hit. Of the three forms of microporosity, the one with the largest Previous HitporeNext Hit throats (porositon “1”) is prevalent in the best reservoir rocks (that is, they have an “M_1” porositon combination). The presence of macropores and micropores, e.g., M_1, in certain of the HWM facies types causes them to act to a first approximation as dual porosity – single permeability system.

Conclusions about the relationships between porositons and reservoir properties include:

  • Efforts on permeability modeling are focused on the M porositon resulting in an improved permeability model.
  • Relative permeability shows significant Previous HitporeNext Hit geometrical controls in addition to wettability, especially in that microporosity contributes to measurable relative permeability primarily through a water saturation offset.
  • Among a range of M_1 dual porositon samples prepared consistently with regards to wettability, Type 1 microporosity controls the water saturation value at which the oil relative permeability curve, Kro, starts to decrease from 100%.
  • Among a range of M_1 dual porositon samples prepared consistently with regards to wettability, the curve shape of the oil relative permeability curve, Kro, as it declines from 100%, is controlled only by the permeability of the M porositon and steepens as that permeability increases.
  • Ultimate recovery forecasts from relative permeability concepts require knowledge of the micro and macro Previous HitporeNext Hit Previous HitsystemsTop.

 

Copyright © 2006. The American Association of Petroleum Geologists. All Rights Reserved.