Reservoir Modelling by Steve Cannon

Author:Steve Cannon
Language: eng
Format: epub
ISBN: 9781119313441
Publisher: John Wiley & Sons, Inc.
Published: 2018-01-30T00:00:00+00:00

6.3.6 Modelling Net-to-Gross (NTG)

An arbitrary classification of the reservoir into sand and shale automatically introduces the concept of net and non-net rock in the gross thickness in a well or gross rock volume of a model. In the real world, however, the sand content of the reservoir is variable, leading to the need for a property that reflects this variability, hence the concept of a NTG ratio. In classic map-based techniques, NTG is a very important factor when modelling the reservoir. This is because there is insufficient vertical resolution in the 2D model; however, in a 3D grid-based model, the vertical resolution is taken into account in the grid building.

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