1 A25 Defining the complete stress tensor from log data – examples from the Hassi Messaoud Field Algeria J. PALUDAN L. OUDJIDA & S. MEKMOUCHE Summary The paper presents a new method developed to accurately characterize the variation of in situ stresses with depth based on conventional logs and borehole image data. By combining existing theory of poro-elasticity with well-established techniques for inversion of borehole image observations it is demonstrated how the full stress tensor including magnitude and orientation of all three principal stresses may be derived directly from the log data. In the absence of available LOT or other


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