Abstract: In some aspects, response data from an injection test of a subterranean region are accessed. An injection treatment is designed based on the response data. The response data are acquired during a series of injection periods and shut-in intervals of the injection test. Each of the injection periods is followed by a respective one of the shut-in intervals.

Abstract: In some aspects, an injection rate of an injection test applied to a subterranean region is controlled. The injection test includes a series of injection periods and shut-in intervals. Each of the injection periods is followed by a respective one of the shut-in intervals. The subterranean region is monitored during the injection test.

Abstract: In some aspects, response data from an injection test of a subterranean region are received during an injection treatment of the subterranean region. The injection treatment is modified based on the response data. In some instances, the response data are acquired during a series of injection periods and shut-in intervals of the injection test. Each of the injection periods is followed by a respective one of the shut-in intervals.

Abstract: In one example of determining fracturing rheological behavior of fracturing fluids, a reference viscosity and fluid properties of a fracturing fluid are received. A fracturing rheological behavior of the fracturing fluid is modeled using a fluid model that models the fracturing rheological behavior of Newtonian and non-Newtonian fluids based, in part, on the received reference viscosity and the received fluid properties of the fracturing fluid. The fracturing rheological behavior of the fracturing fluid is provided. If a fracturing fluid is a mixture of two or more fracturing fluids, then a rheological behavior of the mixture is modeled based on a mixing rheological model. The fracturing rheological behavior of the mixture is then modeled based on the rheological behavior modeled by the mixing rheological model.

Abstract: In some aspects, first and second boundaries are computed based on locations of microseismic events associated with a stimulation treatment of a subterranean region. Based on the first and second boundaries, an uncertainty associated with a stimulated reservoir volume (SRV) for the stimulation treatment is identified. The first and second boundaries are defined in a common spatial domain and at least a portion of the second boundary resides outside the first boundary.

Abstract: In some aspects, a first boundary is computed based on microseismic event locations associated with a first stage of a multi-stage injection treatment of a subterranean region. A second boundary is computed based on microseismic event locations associated with a second stage of the multi-stage injection treatment. Based on the first and second boundaries, an overlap between stimulated reservoir volumes (SRVs) associated with the first and second stages is determined.

Abstract: In some aspects, a closed boundary is computed based on locations of microseismic events associated with a stimulation treatment of a subterranean region. Based on the boundary, a stimulated reservoir volume (SRV) for the stimulation treatment is identified. The boundary encloses a first subset of the locations and a second, different subset of the locations reside outside the boundary.

Abstract: In some aspects, data for a new microseismic event associated with a stimulation treatment of a subterranean region is received. A boundary that was previously computed to enclose locations of prior microseismic events associated with the stimulation treatment is identified. The boundary is modified based on the data for the new microseismic event.

Abstract: Systems, methods, and software can be used to simulate a fracture treatment. In some aspects, physically separate rock blocks of a subterranean zone are modeled by separate block models. The block model for each physically separate rock block represents intra-block mechanics of the rock block, for example, as a group of discrete block elements. Interactions between adjacent pairs of the rock blocks are modeled by separate joint models. The joint model for each adjacent pair of rock blocks represents inter-block mechanics between the adjacent rock blocks, for example, as pre-defined joints. The block models and joint models are used to simulate an injection treatment of the subterranean zone.

Abstract: Systems, methods, and software can be used to simulate a fracture treatment. In some aspects, a common solution vector for multiple distinct subsystem models is defined. Each subsystem model represents a distinct subsystem of an injection treatment system. Parameters of the subsystem models are updated based on the solution vector according to predefined relationships between the solution vector and the parameters of the subsystem models. The subsystem models are operated based on the solution vector and the updated parameters.

Abstract: Systems, methods, and software can be used to analyze microseismic data from a fracture treatment. In some aspects, fracture planes are identified based on microseismic event data from a fracture treatment of a subterranean zone. Each fracture plane is associated with a subset of the microseismic event data. Confidence level groups are identified from the fracture planes. Each confidence level group includes fracture planes that have an accuracy confidence value within a respective range. A graphical representation of the fracture planes is generated. The graphical representation includes a distinct plot for each confidence level group.

Abstract: Systems, methods, and software can be used to identify properties of fractures in a subterranean zone. In some aspects, a basic plane orientation is determined for each of a plurality of basic planes. The basic planes are defined by coplanar subsets of microseismic event data from a fracture treatment of a subterranean zone. The quantity of the basic plane orientations in each of a plurality of ranges is calculated. In some implementations, a histogram is displayed to indicate the quantity of basic plane orientations in each of the orientation ranges. A dominant fracture orientation is identified for the subterranean zone based on one or more of the identified quantities.

Abstract: Systems, methods, and software can be used to analyze microseismic data from a fracture treatment. In some aspects, data for a new microseismic event are from a fracture treatment of a subterranean zone. An updated parameter for a fracture plane is calculated. The fracture plane was previously generated based on data for prior microseismic events. The updated parameter calculated is calculated based on the data for the new microseismic event and the data for the prior microseismic events. A graphical representation of the fracture plane is displayed based on the updated parameter.