--> Abstract: Open Hole Interpretation of thin Beds and Conglomerates Assisted by FMS, by L. Kreczy; #90942 (1997).

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Abstract: Open hole interpretation of thin beds and conglomerates assisted by FMS

KRECZY, LEOPALD

The scope of RAG's in-house FMS interpretation is to provide answers within the time frame required to make urgent decisions about open hole testing and well completion and to help characterize the reservoir.

Considering the small thickness of the potential layers (often in the range of 0.2 to 0.5 m) and the complex lithology of the conglomerates (limestones, dolomites, crystalline, quartz and abundant mica as components) the logs have to be interpreted at, or beyond, their normal range of capabilities.

The FMS is a powerful indicator to discriminate false indications of the other logs, due to lithology changes, from actual gas presence. In order to get the optimum information out of the images, dynamic normalization methods are applied. They include all the samples of a selected interval and apply dynamic normalization values assigned for this so-called "sliding window". Various methods for image enhancement and carefully selected color spectra are used.

In order to cut down the number of OHT's, the FMS is used extensively to detect sediment features indicating very local events (slumps from the slope with very limited sand-reservoirs) which will not produce at an economic rate.

Formation imaging using microelectronic arrays has benefited RAG's log evaluation since its introduction in the mid-1980's.

AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria