Increasing interest in the interpretation of data from thin beds has stimulated the recent publication of several papers on techniques to enhance the vertical resolution of standard logs which avoid the use of deconvolution operators. The application of these techniques to induction logs has been inhibited by the fact that individual coil pair signals from conventional tools are not available at the surface. With array devices this difficulty is removed, and it becomes a relatively simple matter to transform the array of vertical response functions to that of the shortest coil pair. By avoiding deconvolution, the transformations are particularly robust, and the non-linearities in response can be ignored without introducing large errors on the computed curves. The improvement is achieved without compromising the depth of penetration which remains that of conventional tools, and the individually enhanced coil measurements give a direct indication of the invasion profile. The technique of using a combination of transformed responses to emphasise bed boundary definition was originally applied to nuclear logs. In this case, its success is dependent upon careful consideration of sampling rates measurement precision and depth and resolution matching procedures. Relationships between the parameters for optimum performance are established. In the case of enhanced density logs, resolution is shown to be a function of mudcake properties, whilst for compensated neutron logs, resolution is improved using a simple alternative procedure.
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Vertical Enhancement By Combination And Transformation Of Associated Responses
M.C. Enstone
M.C. Enstone
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Paper presented at the SPWLA 31st Annual Logging Symposium, Lafayette, Louisiana, June 1990.
Paper Number:
SPWLA-1990-HH
Published:
June 24 1990
Citation
Elkington, P.A.S., Samworth, J.R., and M.C. Enstone. "Vertical Enhancement By Combination And Transformation Of Associated Responses." Paper presented at the SPWLA 31st Annual Logging Symposium, Lafayette, Louisiana, June 1990.
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