Geothermal reservoirs can be considered as a promising target for inverse techniques
based on thermal and hydraulic observations. In many cases, reservoir temperatures
are highly sensitive to heat transport by fluid advection and thus carry information
which can be used to estimate hydraulic permeabilities as well as thermal rock
properties. Temperatures and hydraulic data, however, are usually sparse and
comparatively expensive. Enlarging the data base for inverse techniques is
particularly important in the pre-development phases. The use of geochemical data and
self-potential measurements will be discussed. Later, during development and
production the interaction with the target is stronger and thus more information can
be extracted, e.g., from production histories and reservoir responses. Earlier
reservoir models then can be optimized, or new revised ones may emerge.

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