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Abstract

The report describes the development of a log interpretation programme, based on logs from four nuclear tools. For each of these tools a theoretical model is developed. The model of the neutron porosity tool is based on one dimensional, three group diffusion theory, that of the gamma density tool is based on one dimensional, five group modified diffusion theory, that of the pulsed neutron, capture gamma tool is based on one dimensional, Fermi-age theory and that of the natural gamma tool on two or three dimensional numerical integration and the use of built-up factors. The four models are incorporated into a computer programme, Nulip. This programme uses as input the experimental data of the four tools at each depth value. From this input the programme calculates the water/oil, the gas and the matrix volume fraction as a function of depth. Also the volume fraction of clay and sand of shale layers may be obtained. The computation is performed by use of iteration and the computing time is about six seconds for each depth value. An example of the use of the programme on actual field data is presented.

Additional information

Authors: OLGAARD P L, TECHNICAL UNIVERSITY OF DENMARK, LYNGBY (DK);PETERSEN R TECHNICAL UNIVERSITY OF DENMARK, LYNGBY (DK), TECHNICAL UNIVERSITY OF DENMARK, LYNGBY (DK)
Bibliographic Reference: EUR 12534 EN (1989), 51 PP., FS, ECU 5, AVAILABLE FROM THE OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
Availability: Can be ordered online
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