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ABSTRACT: Integrating Sequence Stratigraphic Analysis and Previous HitReservoirNext Hit Petrophysics : a value-added approach to Previous HitReservoirNext Hit Characterization in Central Sumatra

Logan, James P. and Victor H. Noguera , Caltex Pacific Indonesia, Rumbai, Indonesia

The value of a sequence stratigraphic framework and its applications to characterizing HC reservoirs in a given field must be measured by two critical yardsticks: 1) how well the framework depicts the actual architecture of both Previous HitreservoirNext Hit and non-Previous HitreservoirNext Hit rocks and 2) how well it contributes to Previous HitpredictingNext Hit the present distribution of gas, oil and water in the subsurface. We propose that Previous HitreservoirNext Hit characterization practices can be greatly improved by the methodical integration of sequence stratigraphic analysis and petrophysical evaluation.

Sedimentary facies models resulting from core studies during sequence analysis can help control Previous HitreservoirNext Hit petrophysical models. Fundamental Previous HitreservoirNext Hit properties such as: Previous HitporosityNext Hit, permeability, bound fluid volumes, residual oil saturation, and fluid contacts are all quite frequently dictated by grain size variability and hence by sedimentary facies. In Previous HitsandstoneNext Hit Previous HitreservoirNext Hit systems initial formation water salinity may change based on the architecture and connectivity of the permeable sands and the distribution of intervening maximum flooding surface shales. These flooding surfaces can assist the formation evaluation geologist in defining zoned petrophysical and fluid properties at the sequence, parasequence set and parasequence (sand pay) levels. Conversely, recognition of fluid contacts from petrophysical evaluations can assist the stratigrapher in identifying sequence boundaries, flooding surfaces, hardgrounds, erosional lags and other important surfaces.

This paper discusses examples from the Central Sumatra Basin which illustrate these relationships. It also proposes a work flow that optimizes the value of Previous HitreservoirTop characterization studies by building on the iteration between the sequence stratigraphic and the petrophysical work.

AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia