232 Geophysics in Geothermal Exploration Figure 7.7 Example of inversion QC at well location: the black curve is the “real” property, while the colored curves are retrieved from seismic inversion. 7.3 Introduction to seismic characterization Unlike the seismic inversion workflow, linear, the seismic characterization is composed of diverse techniques to qualitatively or quantitatively link the reservoir properties to the seismic information. In this exploration of methodologies, the seismic inversion results, especially the synthetic seismic data and the impedances, are key inputs, but not the only one, to build a custom-made workflow adapted to each case, considering both its objectives and the data available. 7.3.1 Exploring well response through a petro-elastic model building The analysis of the well response (in terms of impedances) with the key property changes is called a petro-elastic model. Performed before the seismic inversion, it can be proposed as a feasibility study to assess its added value in projects. Although these considerations may change by projects, the properties are evaluated in this order, impacting less and less the impedances: lithology, porosity, then fluid.
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