--> Abstract: Reservoir Description and Characterization from Well Logs and Electrical Images, by D. Motet, J-P. Delhomme, and O. Serra; #90987 (1993).
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MOTET, DANIEL, JEAN-PIERRE DELHOMME and OBERTO SERRA, Schlumberger, Montrouge, France

ABSTRACT: Previous HitReservoirNext Hit Description and Previous HitCharacterizationNext Hit from Well Logs and Electrical Images

Previous HitCharacterizationNext Hit of the Previous HitreservoirNext Hit requires its description in terms of volumes and surfaces. The internal organization of volumes is described in order to determine their Previous HitflowNext Hit properties. The transmissivity properties of surfaces are deduced from their nature and origin. Imaging techniques play a fundamental role in achieving this Previous HitcharacterizationNext Hit. High-resolution images bring numerous details about bed heterogeneities and sedimentary structures. This information can now be quantified through geology-driven image analysis techniques. Linked to the lithological information derived from standard logs, this allows identification of facies, genetic sequences and depositional environments. In turn, this is the key to inferring the lateral extent of permeability barriers or paths and identi ying the major Previous HitflowNext Hit Previous HitunitsNext Hit in each well.

Previous HitFlowNext Hit baffles and conduits related to tectonic events, such as faults and fractures detected in borehole images, are also integrated into the description of each Previous HitreservoirNext Hit unit. Within Previous HitflowNext Hit Previous HitunitsNext Hit, directional information can be derived from an automated analysis of sedimentary structures over cross-bedded intervals or of open fractures over fractured intervals.

This Previous HitreservoirNext Hit zonation in terms of Previous HitflowNext Hit properties and the tectonic information that is obtained in each well, provides data for the reconstruction of interwell Previous HitreservoirNext Hit geometry.

The detailed information brought by electrical borehole images is very helpful to develop a geologically-reasoned description of the subsurface in terms of large-scale Previous HitreservoirNext Hit Previous HitunitsNext Hit. This description can be refined by reconciling it with well tests and Previous HitflowTop data at each reasoning step.

The approach is illustrated by case studies in carbonate and siliciclastic environments.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.