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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
Exploration and Development of Lobate Backbarrier Facies Sandstones
Gregory W. Geehan (1), Thomas P. Grimes (1), Donald C. Swanson (1)
ABSTRACT
Lobate backbarrier sandstones deposited as washover fans and flood-tidal deltas are major reservoirs for stratigraphically trapped hydrocarbons on the Gulf Coast. Understanding backbarrier facies relationships can improve the efficiency of exploration and development in three ways: 1) recognition of their irregular to lobate geometry (rather than simply linear parallel to depositional strike) allows more accurate predictive reservoir mapping, 2) detailed correlation and mapping of each individual wedge of reservoir provides more precise determination of the updip pinch-out, and 3) resistive zones on electric logs, representing coals or tight sandstones, can be used as "adjacent clues" to the nearby presence of a backbarrier reservoir. Application of these concepts in south Texas led to the extension of the previously abandoned Draper Field.
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