Quantitative evaluation of rock brittleness and fracability based on elastic-wave velocity variation around borehole
Brittleness and fracability are two important rock properties in hydraulic fracturing of unconventional reservoirs. Based on the variation of compressional and shear velocity around borehole using acoustic measurement, an effective technique is developed to estimate these parameters to guide reservo...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2016-06-01
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| Series: | Petroleum Exploration and Development |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1876380416300532 |
| _version_ | 1818617739756961792 |
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| author | Xiaoming TANG Song XU Chunxi ZHUANG Yuanda SU Xuelian CHEN |
| author_facet | Xiaoming TANG Song XU Chunxi ZHUANG Yuanda SU Xuelian CHEN |
| author_sort | Xiaoming TANG |
| collection | DOAJ |
| description | Brittleness and fracability are two important rock properties in hydraulic fracturing of unconventional reservoirs. Based on the variation of compressional and shear velocity around borehole using acoustic measurement, an effective technique is developed to estimate these parameters to guide reservoir-fracturing. During drilling, when the rock is broken, a significant amount of drilling induced cracks will occur in the formation around the borehole, reducing elastic wave velocity around borehole and causing the wave velocity variation away from borehole. The radial variation of compressional and shear velocities of formation rocks surrounding a borehole were respectively obtained from P-wave travel time tomography and dipole shear-wave dispersion inversion. By integrating the two variation profiles along the radial direction, the brittleness-fracability index is obtained to estimate the brittleness and fracability of formation rocks. The index shows fairly good consistency and correlation with rock brittleness and fracability, which demonstrates the practicability and effectiveness of the proposed approach. Well log data analysis examples are presented to demonstrate the effectiveness of our technique. Key words: rock brittleness-fracability, brittleness-fracability index, radial acoustic velocity variation, acoustic well logging, elastic-wave velocity |
| first_indexed | 2024-12-16T17:10:29Z |
| format | Article |
| id | doaj.art-bf2bb521b7734526a08d7067e8766b54 |
| institution | Directory Open Access Journal |
| issn | 1876-3804 |
| language | English |
| last_indexed | 2024-12-16T17:10:29Z |
| publishDate | 2016-06-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Petroleum Exploration and Development |
| spelling | doaj.art-bf2bb521b7734526a08d7067e8766b542022-12-21T22:23:25ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042016-06-01433457464Quantitative evaluation of rock brittleness and fracability based on elastic-wave velocity variation around boreholeXiaoming TANG0Song XU1Chunxi ZHUANG2Yuanda SU3Xuelian CHEN4School of Geosciences & Technology, China University of Petroleum, Qingdao 266555, ChinaSchool of Geosciences & Technology, China University of Petroleum, Qingdao 266555, ChinaSchool of Geosciences & Technology, China University of Petroleum, Qingdao 266555, ChinaSchool of Geosciences & Technology, China University of Petroleum, Qingdao 266555, ChinaCorresponding author; School of Geosciences & Technology, China University of Petroleum, Qingdao 266555, ChinaBrittleness and fracability are two important rock properties in hydraulic fracturing of unconventional reservoirs. Based on the variation of compressional and shear velocity around borehole using acoustic measurement, an effective technique is developed to estimate these parameters to guide reservoir-fracturing. During drilling, when the rock is broken, a significant amount of drilling induced cracks will occur in the formation around the borehole, reducing elastic wave velocity around borehole and causing the wave velocity variation away from borehole. The radial variation of compressional and shear velocities of formation rocks surrounding a borehole were respectively obtained from P-wave travel time tomography and dipole shear-wave dispersion inversion. By integrating the two variation profiles along the radial direction, the brittleness-fracability index is obtained to estimate the brittleness and fracability of formation rocks. The index shows fairly good consistency and correlation with rock brittleness and fracability, which demonstrates the practicability and effectiveness of the proposed approach. Well log data analysis examples are presented to demonstrate the effectiveness of our technique. Key words: rock brittleness-fracability, brittleness-fracability index, radial acoustic velocity variation, acoustic well logging, elastic-wave velocityhttp://www.sciencedirect.com/science/article/pii/S1876380416300532 |
| spellingShingle | Xiaoming TANG Song XU Chunxi ZHUANG Yuanda SU Xuelian CHEN Quantitative evaluation of rock brittleness and fracability based on elastic-wave velocity variation around borehole Petroleum Exploration and Development |
| title | Quantitative evaluation of rock brittleness and fracability based on elastic-wave velocity variation around borehole |
| title_full | Quantitative evaluation of rock brittleness and fracability based on elastic-wave velocity variation around borehole |
| title_fullStr | Quantitative evaluation of rock brittleness and fracability based on elastic-wave velocity variation around borehole |
| title_full_unstemmed | Quantitative evaluation of rock brittleness and fracability based on elastic-wave velocity variation around borehole |
| title_short | Quantitative evaluation of rock brittleness and fracability based on elastic-wave velocity variation around borehole |
| title_sort | quantitative evaluation of rock brittleness and fracability based on elastic wave velocity variation around borehole |
| url | http://www.sciencedirect.com/science/article/pii/S1876380416300532 |
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