Schlumberger Technology Corporation

Services Petroliers Schlumberger

Schlumberger Holdings Limited

Geoquest Systems B.v.

Logined B.v.

Laurent Maerten

Frantz Maerten

Mustapha Lejri

Jean Pierre Joonnekindt

Mostfa Lejri

A method for predicting a stress attribute of a subsurface earth volume includes simulating a linearly independent far field stress model, a discontinuity pressure model, and a discontinuity pressure shift model for the subsurface earth volume. A stress value, a discontinuity pressure shift at a surface of the Earth, a strain value, a displacement value, or a combination thereof is computed for data points in the subsurface earth volume based on a superposition of the linearly independent far field stress model, the discontinuity pressure models, and the discontinuity pressure shift model. The stress attribute of the subsurface earth volume is predicted, based on the computed stress value, the computed discontinuity pressure shift at the surface of the Earth, the computed strain value, the computed displacement value, or the combination thereof.

Downhole modeling using inverted pressure and regional stress

Provided are a method, computer-readable medium, and a system for determining rupture envelopes for a fault system. The method includes obtaining a representation that depicts one or more faults in a region of the earth as triangulated surfaces; selecting variables from among parameters comprising stress ratio, orientation of far field stress maximum principal stress, intermediate principal stress, minimum principal stress for the far field stress, and sliding friction and cohesion of the fault system; determining a strain energy of a triangular element based on a friction coefficient, a normal stress on the triangular element, and a cohesion for the variables; summing the strain energy of each triangle in the triangulated surfaces to yield an effective shear strain energy; extracting one or more iso-surfaces of the effective shear strain energy based on the summing; and creating rupture envelopes for specific values of the effective shear strain energy.

Determining rupture envelopes of a fault system

A method () can include receiving data for fractures associated with a geologic environment (); performing stress inversion, based at least in part on a portion of the data and assignment of different mechanical fracture types to different populations of the fractures, to recover tectonic stress (); and outputting the tectonic stress ().

Inversion for tectonic stress

Stress and fracture modeling using the principal of superposition is provided. A system simulates linearly independent far field stress models for a subsurface earth volume, computing stress, strain, and displacement values based on superposition of independent stress tensors. Based on the precomputed values, the system generates real-time recovery of paleostress values, or, stress, strain, and displacement parameters for any point in the subsurface volume as the user varies far field stress values. The system recovers one or more tectonic events, or a stress tensor represented by a ratio of principal magnitudes and associated orientation, using fault geometry, well bore data (fracture orientation and secondary fault plane data), GPS, InSAR, folded and faulted horizons, tiltmeters, slip and slikenlines on faults. The system uses different geologic data from seismic interpretation, well bore readings, and field observation to provide numerous results, such as predicted fracture propagation based on perturbed stress field.

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Clapiers, France

Laurent Maerten