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The technology for determination of effective porosity in terrigenous reservoirs in drilled and cased holes

The technology is intended for quantitative evaluation of effective porosity using the data from Gamma-Ray Spectrometry.

The data from Spectral Gamma-Ray Logging allows to evaluate the mineralogical composition of cement. This is used to determine the hydrogen content in the chemically bound water and in the physically bound water (i.e. water retaining capacity of various types of cement: quartzy, carbonaceous and argillaceous cement).

The advantage of the technology is in the fact that is does not depend upon geological and technological environment in which logging is carried out: It may be applied in both open holes as well as in cased holes (in the old well stock).

No similar foreign technology exists.

The figure displays an example of effective porosity evaluation in a cased hole. Effective porosity readings were correlated with Rpor eff NML (NML measurements were carried out in an open hole in 1999, Spectral Gamma-Ray Logging in 2004).

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UE - normalized energy of the Lamb-Stoneley wave; - integral natural radioactivity (Gamma-Ray Logging prototype);
UEKT - radioactivity caused by Potassium and Thorium contents;
Rpor GRSL - open porosity according to the data from Neutron Logging and Gamma-Ray Spectrometry;
Rpor eff GRSL - effective porosity with regard to Spectral Gamma-Ray Logging data;
Rpor eff NML - effective porosity according to NML logging;
Potassium, Thorium, Uranium - contents of radio elements in the rock;
Kaolinite, hydromica - contents of clayey minerals in the rock;
U1, U2 - free fluid index (NML) in different times;
W - total hydrogen contents in the rock.


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