Abstract

During the past decade, significant additional recovery of oil and gas has come from intensive, non-tertiary development of mature fields. The potential for additional recovery is related directly to reservoir heterogeneity. The more geologically complex a reservoir, the greater the potential for additional recovery. Stratigraphic and structural complexities segment the reservoirs into isolated or partly connected compartments. Commonly, inadequate distribution of wells mostly located according to grids that ignore geological variability in the interwell area-results in uncontacted and poorly drained compartments. Basic knowledge of lithological and petrophysical architecture, along with fundamental production attributes, is essential for delineating reservoirs with maximum additional production potential. Potential is low in reservoirs with relatively homogeneous facies architecture, such as wave-dominated deltas and barrier-bar reservoirs of the Woodbine Formation (Cretaceous) that show recoveries in excess of 80% in the extensively drilled East Texas field. In contrast, potential is high in complex reservoirs such as those formed by laterally discontinuous meanderbelt sandstones, restricted platform carbonates, or slope-basin fan channels.

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