Analyzing fracture stratigraphy

摘要

Systems, methods, and software can be used to calculate fracture stratigraphy of a subterranean zone. In some aspects, microseismic event data associated with a fracture treatment of a subterranean zone are received, and the subterranean zone includes multiple subsurface layers. A filter is used to select a subset of the microseismic event data corresponding to fractures in a particular subsurface layer. Fracture stratigraphy is calculated for the particular subsurface layer from fracture planes associated with the selected subset of the microseismic event data.

主权项

1. A computer-implemented method for identifying fracture stratigraphy based on microseismic data, the method comprising:
receiving microseismic event data associated with a fracture treatment of a subterranean zone, the subterranean zone including a plurality of subsurface layers; using a filter to select a subset of the microseismic event data, the selected subset of the microseismic event data associated with a particular subsurface layer in the subterranean zone, wherein the filter includes filter parameters that define a specified region within the particular subsurface layer, wherein using the filter to select the subset of the microseismic event data includes identifying microseismic events in the specified region; generating, by data processing apparatus, a plurality of fracture planes based on the selected subset of microseismic event data associated with the identified microseismic events in the specified region within the particular subsurface layer; calculating, by data processing apparatus, a fracture stratigraphy for the particular subsurface layer, wherein the fracture stratigraphy is calculated from the fracture planes generated using the selected subset of the microseismic event data associated with the identified microseismic events in the specified region within the particular subsurface layer; and correlating the calculated fracture stratigraphy with mechanical stratigraphy for the particular subsurface layer, wherein correlating the calculated fracture stratigraphy with mechanical stratigraphy for the particular subsurface layer comprises comparing spatial variations in the calculated fracture stratigraphy with spatial variations in mechanical properties of rock in the particular subsurface layer of the subterranean zone; and controlling an injection treatment based on the calculated fracture stratigraphy.