Schlumberger Technology Corporation

Di Cao

Ping Zhang

Hui Li

Takeshi Endo

Paul Bolchover

Jean-Pierre Poyet

Benoit A Foubert

Yuxin Tang

Christophe Laurent

Jongha Lee

Kenzo Hara

Toshifumi Matsuoka

Nicholas Banchet

A system, computer-readable medium, and method for identifying drilling events in drilling reports, of which the method includes receiving one or more drilling reports including text data representing one or more observations recorded during a drilling activity, identifying a drilling event, a drilling activity, or both from the text data using a model, obtaining feedback based at least in part on the drilling event, the drilling activity, or both that were identified, and training the model based on the feedback.

Detecting events in well reports

A method and apparatus for determining formation slowness around a borehole are provided. The Fresnel volume concept is applied for traveltime tomography. The Fresnel volume represents a sonic wave propagation path about the borehole. The application of Fresnel volume to sonic data provides for a stable inversion and makes practical 3-D tomography. Inversion is accomplished by an iterative back-projection method.

Methods for determining formation and borehole parameters using fresnel volume tomography

A method for the design of VSP surveys for the purpose of imaging a reef in the formations surrounding the well in question. The basic steps include:

Method of designing geophysical surveys

The present invention relates to a method of controlling the quality of seismic data that has been migrated using the generalized Radon transform, the method serving to pass between a seismic data space and a migrated image space, in which method a parameter table is calculated giving, for a seismic wave going from a point of the image to a source or a sensor, its path length, its travel time, and the angles of incidence of the wave at the beginning and at the end of the path, and in which correspondence is established between at least one zone of a first one of said two spaces and at least one zone of the second space, by using said parameter table to fill in a correspondence table QCimage.

Method of controlling the quality of seismic data migration by using the generalized radon transform description

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Yokohama, Japan

Di Cao