System and method for microseismic analysis

摘要

This invention provides a method for characterizing natural fracture networks or other textural networks in an Earth formation when using microseismic monitoring of a hydraulic fracturing job. The method comprises receiving (120) microseismic data from a hydraulic fracturing event, identifying a data subset (153) comprising components of the microseismic data associated with the one or more hydraulic fractures; and obtaining a remainder dataset (156) of the microseismic data by removing the subset from the microseismic data. One approach for identifying the data subset, after removing high uncertainty microseismic events, is to create a Voronoi diagram of a plurality of cells each associated with one of the microseismic events, determine a density for each cell, create a connectivity matrix of the high density cells and identify event clusters in the connectivity matrix which are aligned with a main growing direction of the hydraulic fracture.

主权项

1. A method for characterizing natural fracture networks or other textural networks in an Earth formation, comprising:
detecting microseismic data from a hydraulic fracturing event using a plurality of geophones; transmitting the microseismic data to a processor; identifying a subset of the microseismic data associated with one or more fractures produced by the hydraulic fracturing event, wherein the subset of the microseismic data comprises components of the microseismic data associated with the one or more hydraulic fractures; obtaining a remainder dataset of the microseismic data by removing the subset from the microseismic data; processing the remainder dataset of the microseismic data, and characterizing the natural fracture networks or the other textural networks in the location of the hydraulic fracturing event, wherein the microseismic data is projected onto a line, the line is partitioned into adjacent bins, a density function is defined for the seismic data along the line and clusters of seismic data are identified along the line.