Chevron U.s.a. Inc.

Joseph Paul Stefani

Christopher Hugh Skelt

Tamas Nemeth

Uwe Karsten Albertin

James P Disiena

Prasenjit Roy

David C Bartel

Andrey H Shabelansky

E Frederic Herkenhoff

Mark A Meadows

Dimitri Bevc

Dileep K Tiwary

Kabilan Krishnamurthy

Lei Zhuo

Yunhui Tan

Ivan Lim Chen Ning

Zhishuai Zhang

Kelly Hughes

Uwe K Albertin

A method is described for predicting and preventing wellbore interactions at wells that are near the injection well. The method includes receiving fiber optics data; performing object detection by detecting object-like events in the fiber optic data; and sending instructions to a hydraulic fracturing system based on the object detection. The method is executed by a computer system.

System and method for preventing wellbore interactions

A method is described for seismic imaging including determination of reservoir stresses. The method may include the use of elastic full waveform inversion (FWI), 3-order elasticity, and finite-difference strain calculations. The method may be executed by a computer system.

System and method for deriving reservoir stresses from 4D seismic data

A method is described for creating a petro-elastic model including receiving, at a computer processor, well log data; computing in situ rock properties; calculating dry frame moduli for a range of porosities based on a rock physics model such as a modified critical porosity model; performing fluid substitutions and computing elastic properties by statistical sampling for the range of porosities; creating a petro-elastic model in a seismic domain; and identifying and producing target hydrocarbon reservoirs based on the petro-elastic model. The method may be executed by a computer system.

System and method for petro-elastic modeling

A method for geomechanical and rock physics modeling of a geologic volume of interest may include solving for the elastostatic boundary value problems using a finite-difference method which applies the Virial Theorem.

System and method for geomechanical and rock physics elastostatic modeling

A method is described that includes accessing, for a geological medium: a horizon model including a plurality of horizons in the geological medium; a fault model including a plurality of faults in the geological medium; and a rock property model including one or more physical rock properties at a plurality of spatial locations on a first grid corresponding to the geological medium. The method further includes determining intersections between the horizons and the faults by correlating the horizon model with the fault model and calculating a faulted structural model for the geological medium in accordance with the intersections between the horizons and the faults. The method further includes generating an earth model for seismic forward modeling by assigning one or more physical rock properties to the faulted structural model in accordance with the rock property model.

System and method of building complex earth models

Stratigraphy is inferred over a volume of seismic information. Seismic images are implemented to create higher fidelity stratigraphic structure by leveraging a process that translates seismic image information back and forth into and out of a space that is flattened on geographic time. The stratigraphic structure inferred may be implemented in seismic modeling.

System and method of inferring stratigraphy from suboptimal quality seismic images

Strength parameters of the contents of subsurface caverns are deduced through seismic information. Known properties of formations surrounding the caverns, and ratios of seismic amplitudes between the caverns and the surrounding formations are leveraged to deduce the strength parameters within the caverns.

System and method for deducing cavern properties

A computer system and a computer-implemented method for evaluating a geophysical model using a grid of points representing locations in a subsurface geological region are disclosed. The method includes storing a geophysical model of the subsurface geological region in a computer readable memory and defining, for the geophysical model, the grid of points representing the locations in the subsurface geological region. The grid of points comprise a plurality of points extending in at least one direction. The plurality of points are variably spaced apart in the at least one direction. The method further includes evaluating, by the computer, the geophysical model using the grid of points.

Variable grid for finite difference computation

A method for obtaining seismic data is disclosed. A constellation of seismic energy sources is translated along a survey path. The seismic energy sources include a reference energy source and a satellite energy source. The reference energy source is activated and the satellite energy source is activated at a time delay relative to the activation of the reference energy source. This is repeated at each of the spaced apart activation locations along the survey path to generate a series of superposed wavefields. The time delay is varied between each of the spaced apart activation locations. Seismic data processing comprises sorting the traces into a common geometry domain and replicating the traces into multiple datasets associated with each particular energy source. Each trace is time adjusted in each replicated dataset in the common-geometry domain using the time delays associated with each particular source. This result in signals generated from that particular energy source being generally coherent while rendering signals from the other energy source is generally incoherent. The coherent and incoherent signals are then filtered to attenuate incoherent signals.

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San Francisco, CA, United States of America

Joseph Paul Stefani