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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: The Relationship of Porosity Development
and Diagenesis in the Upper Cretaceous
Guadalupe Formation, Neiva Basin, Colombia
By
The Guadalupe Formation, a prolific hydrocarbon producing
shallow marine 
sandstone
, has a complex diagenetic
history resulting in reservoirs which are characterized by
abundant secondary porosity. The development of the secondary
pore system is controlled by the pore water chemistry and
depositional environment. A study of the Palogrande, Tello,
and Cebu Fields shows significant variations in the type and
amount of secondary pores, secondary cements, and authigenic
clay in all three fields. Illite and chlorite occur in variable
amounts in each field, but are less common in the Cebu Field.
Distinct stratigraphic intervals containing chlorite have been
identified, suggesting that depositional environment controls
its occurrence. In environments where original sediments had
the highest porosity, diagenetic processes
have resulted in the
greatest reduction in porosity and permeability.
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