Method for quantitative evaluation of fluid pressures and...

Details Method for quantitative evaluation of fluid pressures and... Method for quantitative evaluation of fluid pressures and...

2011-07-05

2011-07-05

Bui, Bryan (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

C702S014000, C367S038000, C367S047000

Reexamination Certificate

active

07974785

ABSTRACT:
Method for evaluating fluid pressures in an underground zone by means of seismic and well data. The zone studied is divided into several time analysis intervals. For each of these intervals, a pre-stack stratigraphic inversion of the seismic data is then carried out using geological a priori information, and a lithoseismic facies cube is determined by lithoseismic analysis. Then, for each facies, relations connecting the seismic impedances of wells to differential pressures in wells are determined in each analysis interval. Finally, a differential pressure cube is determined using the previous relations, as well as a confining pressure cube, in order to determine the fluid pressures in the subsoil by simple difference between these two cubes. Application: petroleum sphere for the detection of overpressure zones during drilling for example.

REFERENCES:
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patent: 6977866 (2005-12-01), Huffman et al.
patent: WO 01/73476 (2001-10-01), None
Rasolofosaon, et al., “Petroacoustic Characterization of Reservoir Rocks for Seismic Monitoring Studies”, Nov. 2003, Oil and Gas Science and Technology, Ed. Technip, Paris, Fr, pp. 615-635, XP002277173, ISSN: 1294-4475.
Rasolofosaon, et al., “Laboratory Petroacoustics for Seismic Monitoring Feasibility Study”, The Leading Edge, Mar. 2004, pp. 252-258, XP002392555 p. 253.
Durrast et al., “P-waveVelocity and Permeability distribution of Sandstones from a Fractured Tight Gas Reservoir” Geophysics, SEG, vol. 67, No. 1, Jan. 2002, pp. 241-253, XP002392556.

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