Statistical analysis of in situ compaction measurements for anthropogenic
land subsidence prediction in the Northern Adriatic basin
D. Bau', G. Gambolati, P. Teatini
Dept. Mathematical Methods and Models for Scientific
Applications, University of Padova, Padova, Italy
ABSTRACT
In situ compaction measurements by FSMT (Formation Subsidence Monitoring
Tool) and CMI (Compaction Monitoring Instrument) developed by Schlumberger
and Western Atlas, respectively, provide a promising technique for a more
realistic evaluation of the rock mechanical properties of productive gas/oil
fields. The results from four measurement campaigns carried out in 1992, 1994,
1996, and 1997 in two deep boreholes of the Northern Adriatic basin indicate
that the sediment compressibility is a few times smaller than that obtained
from laboratory tests on rock samples. However, the large data dispersion as
well as the high variability of the associated standard deviation suggest
that more experiments are needed before FSMT and CMI can be used to reliably
predict the expected land subsidence over depleted gas fields in the Northern
Adriatic basin.
