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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Subtle, Bypass Carbonate Pay
Abstract
Using well bore data to identify productive flow units in carbonates is always a challenge. In complex carbonates, particularly with older wells having poor data, the task can be very difficult to impossible. Fortunately, there are now available a variety of through casing logging devices which provide data quality similar to open hole data.
Using existing well bore data to optimize pay identification, several basic geological/petrophysical concepts and relationships must be understood and applied.
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Determine valid Rw and porosity values (by lithology) to compute Sw from Archie.
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Identify and label porous zones (flow units) of uniform attributes using log data, core measurements and sample description.
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Develop a pore geometry model for the formation of interest, based on core measurements, sample description and thin section/SEM photo petrology.
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Prepare a profile of Sw-Depth by flow unit to identify pore type by flow unit, because;
Sw f Pore Geometry and Buoyancy Pressure (Pb-height in hydrocarbon column).
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