The lower Oligocene Vicksburg Formation of the Texas Gulf Coastal Plain contains major petroleum reservoirs in the Rio Grande Embayment and the Houston Embayment. Several discoveries in these areas over the past few years have led to renewed interest in the potential for undiscovered fields in the embayments as well as in the San Marcos Arch region. Knowledge of the depositional systems distribution during Vicksburg times is essential to understanding sand concentration and is fundamental to effective exploration and production of the section.

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