Abstract: 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.

Abstract: A system includes a plug standard formed of a geomaterial, a fiber optic cable and a support lattice embedded within the plug standard, and a joint attached to an end of the fiber optic cable outside of the plug standard. The fiber optic cable captures at least strain measurements and temperature measurements of the plug standard. The support lattice supports the fiber optic cable within the plug standard, and the joint connects the fiber optic cable with a fiber optic interrogator.

Abstract: 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.

Abstract: A method for measuring a strain field involves determining an expected source mechanism of the strain field, based on the expected source mechanism, estimating strain field tensors of the strain field in an area of interest, determining principal strain vectors from the strain field tensors, identifying the most extensional principal strain vectors, ?3, from the principal strain vectors, establishing a trajectory of a fiber optic path through the area of interest, discretizing the fiber optic path to obtain directions of fiber axial strain, ?a, comparing ?a against ?3, and based on the comparison, optimizing the fiber optic path for an alignment of ?a with ?3.