Field Development and Renewed Reservoir Characterization for CO2 Flooding of the Hall-Gurney Field, Central Kansas

Kansas Geological Survey
Open-file Report 2001-38

Permeability and Porosity

Porosity in L-KC oomoldic limestones ranges from 0-35%. Generally rocks exhibiting porosity below 15% porosity are non-reservoir.

Permeability (0.001-400 md) is principally controlled by:

Oomold connectivity

Other variables that exert influence but are colinear with the above variables include:

Oomold diameter
Oomold packing
Matrix properties
Matrix fracturing/crushing

Although permeability is controlled by and correlates with several of these variables (below), multivariate linear regression methods only improve prediction from a factor of 6.9X to 5.4X by inclusion of information concerning connectivity index, as measured on rock pieces.

Basic porosity equation:

log k = 0.112 phi - 2.48 SE = 7X
With Connectivity Index:  
log k = 0.090 phi + 0.47 Connectivity Index - 3.21 SE=5.5X

Individual wells generally exhibit k-phi trends with less variance than the overall trend. Development of models for specific fields, representing unique associations of conditions, allows the most accurate prediction.

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Last updated December 2001