Characterization of Lower Eocene Reservoirs in the LL-652 Area, Lagunillas Field - Final Report

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1994

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Lower Eocene reservoirs (C members) in the LL-652 area will contain substantial volumes of remaining oil (923 million barrels [MMbbl]) after primary development. This resource exists in poorly drained or undrained reservoir compartments defined by a combination of complex structure and heterogeneous tide-dominated deltaic facies geometry. The product of this combined structural and depositional complexity is reservoirs that have a high degree of geologic heterogeneity, considerable variation in reservoir quality, and, therefore, a low recovery efficiency. The tide-dominated deltaic depositional model of the C members in the LL-652 area captures a system of dip-elongate, distributary-channel sandstones that merge northeastward with extensive, dip-parallel delta-front sandstones. These two facies compose most of the reservoir sandstones and therefore contain most of the remaining oil. Permeability range and average are similar for the major facies. However, there are significant permeability contrasts (up to three orders of magnitude) locally between distributary-channel and tidal-flat, fluvial-estuarine channel and distal delta-front, and distributary-channel and delta-front facies where clay clasts at the base of the distributary-channel facies may retard vertical fluid flow.

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