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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Diagenesis of Ozona Canyon Fracture Fills: Implications for Potential Fractured Reservoirs in the Ozona Gas Play, Val Verde Basin, West Texas
Abstract
Small, densely mineralized natural fractures in two Ozona Canyon cores from the northern part of the main gas trend record a complex diagenetic history of porosity creation and destruction within the sandstones and their fractures. These fractures contain evidence of two principal fracture-fill stages: quartz precipitation, which is associated with creation of fracture porosity, and ankerite precipitation, which coincides with fracture-porosity occlusion. Available evidence permits no definitive conclusions regarding whether fractures elsewhere in the Ozona trend are larger, more open, or more interconnected. Nevertheless, fracture petrology suggests that extensive fracture porosity once existed in these rocks and that playwide variability in postfracture cementation history could be the controlling factor in the distribution of any remaining fracture porosity.
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