No operator will knowingly decide to develop a marginal field uniess for research and development purposes.

Having said this, it is obvious, from the amount of publicity given to marginal discoveries, that there are such things as marginal fields.

This paper seeks to establish a definition of a marginal field, and the factors resulting in that definition.

Methods of improving the financial viability of such fields are described, using the particular qualities of flexible flowlines, floating production and storage facilities, and subsea completion or "tieback" technology.

The concept outlined is called progressive for the simple reason that the equipment used, because it is designed on a modular basis, allows the development of the field to progress from the initial testing or early production phase through to the final system, without significant interruption, irrespective of what the final system is.

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