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


Growth of equant calcite
spar in isopachous rims on ooid grains -
occlusion of porosity
Dissolution of ooids-
creation of isolated
oomoldic porosity
Continued dissolution of
grains and early calcite
cement - creation of
connected porosity
Growth of equant calcite
spar on inner walls of
oomolds - decreases
Slight crushing of some ooids to form
connections between pores
Continued growth of
carbonate cement, ferroan
calcite, and baroque
dolomite during burial. Possible complete occlusion of porosity

Generalized Paragenetic Sequence

(after Watney et al, 1993)

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Last updated May 2003