--> ABSTRACT: Effect of Isolated Biomoldic Porosity on Log Analysis of Pennsylvanian Carbonate Reservoir, North Texas, by Hughbert Collier; #91026 (2010)
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Effect of Isolated Biomoldic Porosity on Previous HitLogNext Hit Analysis of Pennsylvanian Carbonate Reservoir, North Texas

Hughbert Collier

Carbonate reservoirs with isolated moldic porosity require more than just routine Previous HitlogNext Hit analysis (cementation exponent = 2, and a logging suite of dual Previous HitinductionNext Hit, microlog, density, and neutron). Either a sonic and/or an electromagnetic propagation tool (EPT) should be part of the logging package. Both tools are effective in analyzing carbonate reservoirs with moldic porosity, but only if sonic porosities are calculated with the Wyllie equation and the EPT is used to calculate a variable, m.

This study documents the Previous HitlogNext Hit analysis of a north Texas well in a Pennsylvanian Canyon limestone with isolated moldic porosity. A thorough logging suite (dual Previous HitinductionNext Hit, microlog, density, neutron, sonic, and EPT) plus two whole cores made a number of analytical techniques possible: productivity ratio index and five methods for calculating m. The reservoir appeared to be productive with routine Previous HitlogTop analysis, but upon further examination the reservoir calculated wet.

AAPG Search and Discovery Article #91026©1989 AAPG Southwest Section, March 19-21, 1989, San Angelo, Texas.