The Role of Moldic Porosity in Paleozoic Kansas Reservoirs and the Association of Original Depositional Facies and Early Diagenesis With Reservoir Properties

Kansas Geological Survey
Open-file Report 2003-32

Permeability and Porosity

Porosity in L-KC oomoldic limestones ranges from 0-35%. Generally rock below 15% porosity are non-reservoir. Permeability (<0.001-400 md) is principally controlled by : Porosity and Oomold connectivity.

Other variables that exert influence but are colinear with the above variables include: Oomold diameter, Oomold packing, Matrix properties, Matrix fracturing. Although permeability is controlled by and correlates with several of these variables (figure 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.

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

Individual wells generally exhibit k- trends with less variance than the overall trend.


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Last updated May 2003