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Appendix I: Hydraulic Fracture Microseismic Monitoring
Pages 229-232

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From page 229...
... Micro­ seismic mapping is a very useful tool in planning fieldwide well development programs, such as horizontal well direction and the spacing between wells, as well as aiding the design of hydraulic fracturing procedures, such as injection rate and fluid volume. Microseismic data are acquired with either an array of seismic instruments (geophones or accelerometers)
From page 230...
... Figure I.2 shows two examples of microseismic mapping results following hydraulic fracturing procedures in Texas: an example from the Barnett shale gas horizontal well showing a complex fracture geometry (right) , and the other from tight gas sands in a vertical well in the Cotton Valley formation, which shows a simple fracture geometry (left)
From page 231...
... drilled in the tight gas sands of the Cotton Valley Formation. The small gray dots show microseismic locations during a gel-based and water-based hydraulic fracturing fluid injection.
From page 232...
... Red events are interpreted to be associated with hydraulic fracturing; blue dots indicate microseismicity associated with the reactivation of a strike-slip fault. See Wessels et al.

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