Chevron U.s.a. Inc.

Westerngeco L.l.p.

Saudi Arabian Oil Company

Geco Technology B.v.

Konstantin Osypov

David Nichols

Ran Bachrach

Can Evren Yarman

Adam Dean Halpert

Laura L Bandura

Maxim Protasov

Daniel Johnson

Andrey H Shabelansky

Colin Michael Sayers

Norman Ross Hill

Shuxing Cheng

David A Wilkinson

Madhumita Sengupta

Huafeng Liu

Vladimir Kazei

Harold Merry

Can E Yarman

A method and system for measuring strain rate at a scale shorter than gauge length are disclosed. The method includes deploying a plurality of discrete seismic receivers and a distributed acoustic system (DAS) in a borehole extending into a formation. The method further includes obtaining a first DAS measurement (DAS1) between a first position and a second position, obtaining a second DAS measurement (DAS2) between a third position and a fourth position, and obtaining a discrete seismic receiver measurement between the second position and the fourth position. The method further includes determining an DAS equivalent discrete measurement (DASeq) from the discrete seismic receiver measurement, determining a sub-gauge DAS measurement (DASsg) based, at least in part, on the first DAS measurement, the second DAS measurement and the DAS equivalent discrete measurement, and determining mechanical characteristics of the formation based, at least in part, on the sub-gauge DAS measurement.

Method and system for measuring strain rate at a scale shorter than gauge length

Systems and methods for training a model that refines estimated parameter values include computer processors and non-transitory electronic storage that stores subsurface map data sets that correspond to different subsurface volumes of interest, the system configured to obtain training data including unrefined subsurface map data sets specifying estimated parameter values of a first parameter as a function of position within corresponding subsurface volumes of interest, obtain an initial seismic mapping model, generate a conditioned seismic mapping model, and store the conditioned seismic mapping model in the electronic storage.

Systems and methods for refining estimated parameter values in seismic imaging

A method is described for seismic imaging that will produce a seismic image with correctly focused and positioned reflectors. This is accomplished by adding physical geological information to a beam tomography process to generate an updated earth model for the seismic imaging. The method may be executed by a computer system.

System and method for seismic imaging

A method is described for seismic facies identification including receiving a seismic dataset representative of a subsurface volume of interest; performing a machine learning algorithm on the seismic dataset to identify seismic facies and generate a classified seismic image; and identifying geologic features based on the classified seismic image. The method may be executed by a computer system.

System and method for seismic facies identification using machine learning

A method is described for seismic imaging including receiving a seismic dataset representative of a subsurface volume of interest and an earth model; decomposing the seismic dataset into a set of data sub-sets based on a decomposition function; imaging each data sub-set using the earth model to generate a set of image sub-sets; and combining the set of image sub-sets based on a criterion to create a high resolution seismic image. The method may be executed by a computer system.

System and method for improving resolution of digital seismic images

A method is described for modifying an earth model including receiving an earth model containing one or more surfaces with surface geometries, such that at least two surface depth locations exist for some horizontal positions; perturbing elastic properties within the earth model; and generating a modified earth model by modifying the surface geometries within the earth model while preserving seismic travel times of the earth model such that after an initial user parameterization all updates of the surfaces are done without additional user input. The method may be executed by a computer system.

System and method for modifying an earth model

A method is described for seismic imaging including receiving a digital seismic image representative of a subsurface volume of interest and an earth model; decomposing the seismic image into a set of image subsets based on an image-domain decomposition function; forward modeling each image subset to generate a set of synthetic data subsets; decomposing each data subset into a set of data sub-subsets based on a data-domain decomposition function; imaging data sub-subsets using the earth model to generate a set of image sub-subsets; and combining the set of image subsets based on a criterion to create a high resolution seismic image. The method may be executed by a computer system.

Computing systems and methods for improving processing of collected data are disclosed. In one embodiment, while ray-tracing through a sub-surface region, a frequency-dependent outgoing ray direction is computed from a point on an interface disposed in the sub-surface region when the ray tracing is at the interface.

Frequency-dependent ray tracing through an interface

A method for updating a velocity model of a subsurface of the earth is described herein. A tomographic update to the velocity model of the subsurface may be performed to generate a tomographic velocity model update. A geomechanical velocity model update of the subsurface may be calculated. The geomechanical velocity model update may be combined with the tomographic velocity model update.

Combining geomechanical velocity modeling and tomographic update for velocity model building

Prior information describing a distribution of values of a parameter relating to physical characteristic of a target structure is received. Acquired survey data of the target structure is received. Using a probabilistic technique, the prior information and the survey data is assimilated to produce an estimated property of the target structure.

Estimating a property by assimilating prior information and survey data

Computing systems and methods for improving processing of collected data are disclosed. In one embodiment, while ray-tracing through a sub-surface region, a frequency- dependent outgoing ray direction is computed from a point on an interface disposed in the sub-surface region when the ray tracing is at the interface.

To update a model of a subterranean structure, a partial decomposition is computed of an operator that is used to compute a parameterization representing the update of the model. The partial decomposition of the operator is selected from among a partial eigendecomposition of a Fisher information operator, and a singular value decomposition of the operator. A term based on additional information is combined with the partial decomposition of the operator to derive an update of the model.

Updating a model of a subterranean structure using decomposition

A method and apparatus for estimating velocity in a subsurface region. Seismic data for a subsurface region may be received. One or more attributes for the seismic data may be calculated. A posterior distribution may be generated. The posterior distribution may represent one or more probabilities of one or more velocities for the attributes. A velocity with uncertainty may be determined for the subsurface region based on the posterior distribution. A pore pressure with uncertainty may be determined based on the velocity with uncertainty.

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Houston, TX, United States of America

Konstantin Osypov