Interferometric hydrofracture microseism localization using neighboring fracture
Hydraulic fracturing is the process of injecting high-pressure fluids into a reservoir to induce fractures and thus improve reservoir productivity. Microseismic event localization is used to locate created fractures. Traditionally, events are localized individually. Available information about event...
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| Format: | Technical Report |
| Language: | en_US |
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Massachusetts Institute of Technology. Earth Resources Laboratory
2014
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| Online Access: | http://hdl.handle.net/1721.1/90444 |
| _version_ | 1811095915920883712 |
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| author | Poliannikov, Oleg V. Malcolm, Alison E. Djikpesse, Hugues Prange, Michael |
| author2 | Massachusetts Institute of Technology. Earth Resources Laboratory |
| author_facet | Massachusetts Institute of Technology. Earth Resources Laboratory Poliannikov, Oleg V. Malcolm, Alison E. Djikpesse, Hugues Prange, Michael |
| author_sort | Poliannikov, Oleg V. |
| collection | MIT |
| description | Hydraulic fracturing is the process of injecting high-pressure fluids into a reservoir to induce fractures and thus improve reservoir productivity. Microseismic event localization is used to locate created fractures. Traditionally, events are localized individually. Available information about events already localized is not used to help estimate other source locations. Traditional localization methods yield an uncertainty that is inversely proportional to the square root of the number of receivers. However, in applications where multiple fractures are created, multiple sources in a reference fracture may provide redundant information about unknown events in subsequent fractures that can boost the signal-to-noise ratio, improving estimates of the event positions. We propose to use sources in fractures closer to the monitoring well to help localize events further away. It is known through seismic interferometry that with a 2D array of receivers, the travel time between two sources may be recovered from a cross-correlogram of two common source gathers. This allows an event in the second fracture to be localized relative to an event in the reference fracture. A difficulty arises when receivers are located in a single monitoring well. When the receiver array is 1D, classical interferometry cannot be directly employed because the problem becomes underdetermined. In our approach, interferometry is used to partially redatum microseismic events from the second fracture onto the reference fracture so that they can be used as virtual receivers, providing additional information complementary to that provided by the physical receivers. Our error analysis shows that, in addition to the gain obtained by having multiple physical receivers, the location uncertainty is inversely proportional to the square root of the number of sources in the reference fracture. Since the number of microseism sources is usually high, the proposed method will usually result in more accurate location estimates as compared to the traditional methods. |
| first_indexed | 2024-09-23T16:33:58Z |
| format | Technical Report |
| id | mit-1721.1/90444 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:33:58Z |
| publishDate | 2014 |
| publisher | Massachusetts Institute of Technology. Earth Resources Laboratory |
| record_format | dspace |
| spelling | mit-1721.1/904442019-04-10T17:33:16Z Interferometric hydrofracture microseism localization using neighboring fracture Poliannikov, Oleg V. Malcolm, Alison E. Djikpesse, Hugues Prange, Michael Massachusetts Institute of Technology. Earth Resources Laboratory Interferometry Fractures Microseismic Hydraulic fracturing is the process of injecting high-pressure fluids into a reservoir to induce fractures and thus improve reservoir productivity. Microseismic event localization is used to locate created fractures. Traditionally, events are localized individually. Available information about events already localized is not used to help estimate other source locations. Traditional localization methods yield an uncertainty that is inversely proportional to the square root of the number of receivers. However, in applications where multiple fractures are created, multiple sources in a reference fracture may provide redundant information about unknown events in subsequent fractures that can boost the signal-to-noise ratio, improving estimates of the event positions. We propose to use sources in fractures closer to the monitoring well to help localize events further away. It is known through seismic interferometry that with a 2D array of receivers, the travel time between two sources may be recovered from a cross-correlogram of two common source gathers. This allows an event in the second fracture to be localized relative to an event in the reference fracture. A difficulty arises when receivers are located in a single monitoring well. When the receiver array is 1D, classical interferometry cannot be directly employed because the problem becomes underdetermined. In our approach, interferometry is used to partially redatum microseismic events from the second fracture onto the reference fracture so that they can be used as virtual receivers, providing additional information complementary to that provided by the physical receivers. Our error analysis shows that, in addition to the gain obtained by having multiple physical receivers, the location uncertainty is inversely proportional to the square root of the number of sources in the reference fracture. Since the number of microseism sources is usually high, the proposed method will usually result in more accurate location estimates as compared to the traditional methods. Massachusetts Institute of Technology. Earth Resources Laboratory (Founding Members Consortium); Schlumberger-Doll Research Center 2014-09-29T18:09:49Z 2014-09-29T18:09:49Z 2011-05-19 Technical Report http://hdl.handle.net/1721.1/90444 en_US Earth Resources Laboratory Industry Consortia Annual Report;2011-06 application/pdf Massachusetts Institute of Technology. Earth Resources Laboratory |
| spellingShingle | Interferometry Fractures Microseismic Poliannikov, Oleg V. Malcolm, Alison E. Djikpesse, Hugues Prange, Michael Interferometric hydrofracture microseism localization using neighboring fracture |
| title | Interferometric hydrofracture microseism localization using neighboring fracture |
| title_full | Interferometric hydrofracture microseism localization using neighboring fracture |
| title_fullStr | Interferometric hydrofracture microseism localization using neighboring fracture |
| title_full_unstemmed | Interferometric hydrofracture microseism localization using neighboring fracture |
| title_short | Interferometric hydrofracture microseism localization using neighboring fracture |
| title_sort | interferometric hydrofracture microseism localization using neighboring fracture |
| topic | Interferometry Fractures Microseismic |
| url | http://hdl.handle.net/1721.1/90444 |
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