Method for quantitatively evaluating fluid pressures and for...

G - Physics – 01 – V

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G01V 1/30 (2006.01)

Patent

CA 2627766

The invention relates to a method for evaluating fluid pressures in an underground area with the help of seismic data and of wells. The area of study is divided into a number of time analysis intervals. For each of these intervals, a stratigraphic inversion is realized before the summation of the seismic data, while using a priori geological information, and a lithoseismic facies cube is determined by lithoseismic analysis. For each facies, relationships linking the seismic impedances of wells to differential pressures of wells, during each of the analysis intervals. Lastly, a differential pressure cube is determined by using the preceding relationships as well as to a containment pressure cube for determining the fluid pressures underground by the simple difference between these two cubes. The invention is for use in the petroleum industry for detecting areas of excess pressure during drilling, for example.

Méthode pour évaluer des pressions de fluide dans une zone du sous-sol à l'aide de données sismiques et de puits. On découpe la zone d'étude en plusieurs intervalles d'analyse en temps. Puis pour chacun de ces intervalles, on réalise une inversion stratigraphique avant sommation des données sismiques, avec utilisation d'information a priori géologique, et l'on détermine un cube de faciès lithosismique par analyse lithosismique. Puis, on détermine pour chacun des faciès des relations reliant les impédances sismiques aux puits aux pressions différentielles aux puits, sur chacun des intervalles d'analyse. Enfin, on détermine un cube de pression différentielle à l'aide des relations précédentes, ainsi qu'un cube de pression de confinement, pour déterminer les pressions de fluide dans le sous-sol par simple différence de ces deux cubes. Application au domaine pétrolier pour la détection des zones de surpression lors de forage par exemple.

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