Compagnie Generale De Geophysique

Marathon Oil Company

Cgg Services Sas

Total

Elf Aquitance Production

Yves Lafet

Raphael Bornard

Benjamin Roure

Thierry Coleou

Pierre Lanfranchi

Laurene Michou

Jeffry G Hamman

Donald H Caldwell

Thierry Des Vallieres

Fabien Allo

Thierry Coléou

Thierry Crozat

Bernard Deschizeaux

Denis Mougenot

Amélie Rodrigue Molle

Didier Parron

Helmut Kuhn

Jeffrey G Hamman

Amelie Rodrigue Molle

Raphaël Bornard

Global inversion of multi-vintage seismic data uses simulated annealing to minimize a cost function simultaneously for all vintages and all angle stacks to yield values of geophysical properties. Each vintage is generated from an independent seismic survey of a subsurface structure conducted over a distinct period of time and includes seismic traces and angle stacks. An initial model of the subsurface structure is used and includes values for geophysical properties and time shift maps between vintages. The time shift map contains shifts in the seismic trace between vintages. The cost function includes a time shift map term for the difference between the time shift map and a calculated time shift of the seismic trace between vintages and is based on a proposed perturbation to at least one of the geophysical properties. The time shift map is also used as a global constraint on proposed perturbations of subsurface properties.

Time-lapse simultaneous inversion of amplitudes and time shifts constrained by pre-computed input maps

A method is provided for predicting a value of a designated rock or fluid property in a subterranean geologic volume. A first predicted value of the designated rock or fluid property is also assigned to a volume of a multi-dimensional, multi-scale model. A first predicted value of seismic response for the model volume is calculated from a response model using the first predicted value of the designated rock or fluid property, wherein the response model is responsive to changes in predicted values of the designated rock or fluid property. A synthetic trace is generated and iteratively compared to the corresponding trace obtained from one or more sets of actual seismic data to determine a difference while consistency is maintained between the types, scales and dimensions of values and data. The first predicted value of the designated rock or fluid property is adjusted in response to the difference to create a second predicted value of the designated rock or fluid property, wherein the second predicted value generally reduces the difference.

Method for predicting quantitative values of a rock or fluid property in a reservoir using seismic data

Method for charting drillable zones in an oilfield avoiding anomaly zones

A method of acquiring and processing seismic data for repetitive monitoring of displacement of fluids impregnating a reservoir deep in the sub-surface below the surface weathered zone comprises the steps of: making at each point of a predetermined grid on the surface a vertical axis shallow borehole in the earth above the reservoir passing through the surface weathered zone; positioning in each borehole along its vertical axis a plurality of fixed receivers adapted to be connected separately to a seismic recorder on the surface; emitting near each borehole seismic waves into the earth by means of an emitter on the surface or close to the surface near the vertical axis of the borehole; recording for each borehole by means of receivers placed in the borehole the direct incident seismic waves and the seismic waves reflected at the interfaces of deep strata of the sub-surface, each receiver providing a separate record of an incident wave and a plurality of reflected waves; and carrying out the following processing for each borehole: picking the first break of direct incident waves, horizontalizing the reflected waves, separating the reflected waves and the direct incident waves, deconvoluting receiver by receiver the reflected waves by the direct incident wave in order to obtain a 0-phase trace for each receiver, and stacking the 0-phase traces from the receivers to obtain a low coverage zero offset 0-phase trace.

Method of acquiring and processing seismic data recorded on receivers

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Paris, France

Yves Lafet