--> Abstract: Assessing Errors in a Multilayer Geological System, by D. Renard; #90937 (1998).

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Abstract: Assessing Errors in a Multilayer Geological System

RENARD, DIDIER

One of the main problems during the development phase of a mature field is to cope with a large number of wells, often deviated, within a complex multilayer geological model. The traditional process, which consists in the estimation of each layer thickness, consecutively from top to bottom, fails to produce correct estimation errors for the bottommost layers.

The methodology presented in this paper consists in taking all the information available into account in a large cokriging system where the data consist in the cumulative thickness counted from a reference surface: hence the ability to account for the deviated well information in a direct manner.

A similar technique can be derived for the more complex problem of honouring simultaneously a set of depth data when the interval velocities (or the apparent velocities for deviated wells) are related to the depth due to compaction laws.

The correct assessment of the errors makes it also possible to produce conditional simulations and therefore to derive meaningful volume calculations.

The crucial problem of the multivariate structure inference will also be addressed.

AAPG Search and Discovery Article #90937©1998 AAPG Annual Convention and Exhibition, Salt Lake City, Utah