Characterization of EGS Fracture Network Lifecycles Page: 2 of 126
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
Foulger Consulting
1 Executive summary............................................................................................................... 4
2 Comparison of actual accomplishments with goals and objectives of the project............... 6
2.1 Significant departures from the work planned in the original proposal.............7
3 Summary of project activities during the entire period of funding ..................................... 8
3.1 Subtask 1.1: Relative relocation software development .............................................. 8
3.2 Subtask 1.2: Time-dependent tomography software development.............................. 10
3.3 Subtask 1.3: Moment tensor software development................................................... 12
3.4 Subtask 2.2: Tomographic inversion for time-dependent changes in crustal structure ... 15
3.4.1 Strategy for independent tomographic inversions............................................... 15
3.4.2 Results of independent tomographic inversions .................................................. 19
3.4.3 Tomographic inversion of all epochs using dtomo ........................................... 22
3.5 Subtasks 2.1, 2.3 & Task 3: Earthquake results for EGS experiments, and integration
with other data...................................................................................................................... 22
3 .5 .1 O v e rv iew ............................................................................................................... 2 2
3.5.2 Background to the EGS experiments ................................................................. 22
3 .5 .3 S eism ic data u sed ............................................................................................ . . 2 8
3.5.4 The EGS experiment in well 34A-9, August 2004 .............................................. 33
3.5.4.1 Details of the well and the stimulation......................................................... 33
3.5.4.2 The tracer test in w ell 34A -9....................................................................... 34
3.5.4.3 Analysis of the induced seismicity ............................................................. 34
3.5.4.3.1 Earthquake time series and magnitudes................................................ 34
3.5.4.3.2 E arthquake locations............................................................................. 40
3.5.4.3.3 Chronological distribution of the co-injection earthquakes .................... 49
3.5.4.3.4 M om ent tensors .................................................................................. . 50
3.5.4.3.5 Joint interpretation with other results .................................................... 57
3.5.5 The EGS experiment in well 34-9RD2, March 2005.......................................... 61
3.5.5.1 Details of the well and the stimulation......................................................... 61
3.5.5.2 The tracer test in w ell 34-9RD 2 .................................................................. 61
3.5.5.3 Analysis of the induced seismicity ............................................................. 62
3.5.5.3.1 Earthquake time series and magnitudes................................................ 62
3.5.5.3.2 E arthquake locations............................................................................. 65
3.5.5.3.3 Chronological distribution of the co-injection earthquakes .................... 73
3.5.5.3.4 M om ent tensors .................................................................................. . 73
3.5.5.3.5 Joint interpretation with other results .................................................... 78
3.5.6 The planned EGS experiment in well 46A-19RD, January 2007......................... 80
3 .5 .6 .1 D etails of th e w ell....................................................................................... . 80
3.5.6.2 Analysis of the seismicity in January 2007................................................... 84
3.5.6.2.1 Earthquake time series and magnitudes................................................ 84
3.5.6.2.2 E arthquake locations............................................................................. 84
3.5.6.2 .3 M om ent tensors .................................................................................. . 88
3 .5 .6 .2 .4 D iscu ssio n ........................................................................................... . 8 9
3.5.7 EG S fracture netw ork lifecycles ........................................................................ 90
3.5.8 Discussion and consolidation of EGS results .................................................... 92
3 .6 C lo sin g statem ents .................................................................................................... . 9 3
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Foulger, Gillian R. Characterization of EGS Fracture Network Lifecycles, report, March 31, 2008; United States. (https://digital.library.unt.edu/ark:/67531/metadc895319/m1/2/: accessed March 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.