Comparison of magnetic and gamma ray logging for correlations in chronology and lithology: example from the Aquitanian Basin (France)

Details Comparison of magnetic and gamma ray logging for correlations in chronology and lithology: example from the Aquitanian Basin (France) Comparison of magnetic and gamma ray logging for correlations in chronology and lithology: example from the Aquitanian Basin (France)

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999geoji.137..839t&link_type=abstract

Geophysical Journal International, Volume 137, Issue 3, pp. 839-846.

Mathematics

Logic

1

Gamma Ray, Lithological Correlation, Magnetic Susceptibility, Magnetostratigraphy

Scientific paper

Precise time and facies correlations between drilled holes are fundamental for a better understanding of the geological evolution of sedimentary basins. A downhole magnetic measurement device called the geological high-sensitivity magnetic tool (GHMT) has been run within two wells drilled by Gaz de France in the Landes oil-field (southwest France) as part of a gas storage exploration program. The method of interpretation of downhole magnetic measurements yielded a magnetostratigraphy within each well, allowing absolute dating and time correlations between the wells. Magnetic susceptibility and natural gamma ray intensity are useful parameters for establishing high-resolution lithological correlations at a basin scale. We present a correlation parameter established from a simultaneous analysis of the susceptibility and the gamma ray logs within each well. The correlation parameter appears to provide a new tool for delineating lithological elements when local lithological changes are too subtle to show clear well-to-well correlations either from susceptibility logs or from gamma ray logs. This new approach is interpreted as a sensitive way to detect relative variations between the detrital and clay content of the penetrated sediment.

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