| 摘要 |
Computing device, software and method for identifying a source mechanism associated with a microseismic event taking place in a subsurface of the earth. The method includes receiving traces associated with a plurality of receivers located in a grid above the subsurface; dividing the grid in a set of sub-blocks, each sub-block including one or more receivers of the plurality of receivers; determining, for each sub-block, a corresponding summation element based on traces associated with the corresponding sub-block; identifying a predetermined number of patterns that are associated with plural source mechanisms; multiplying each summation element by a polarization coefficient according to a corresponding pattern; calculating in the computing device, for each pattern, a semblance function based on summation elements of the sub-blocks; and identifying the source mechanism of the microseismic event based on the semblance function. A pattern includes a first subset of the sub-blocks having positive polarity and a second subset of the sub blocks having negative polarity, and the first subset together with the second subset form the entire set of the sub-blocks. Figure 17 Receiving traces associated with a plurality of receivers located in a grid above the subsurface Dividing the grid in a set of sub-blocks, each sub-block including one or more receivers of the plurality of receivers Determining, for each sub-block, a corresponding summation element based on traces associated with the corresponding sub-block r_1 706 Identifying a predetermined number of patterns that are associated with plural source mechanisms Calculating in the computing device, for each pattern, a semblance function based on summation elements of the sub-blocks Identifying the source melanism of the microseismic event based on the semblance function |
