| Institute of Geomechanics, Chinese Academy of Geological Sciences | Host |
| Citation: |
Huimin LIU, Jinkai ZHENG, Wenshan ZHAO, Zhenjing DU, Jing LI, Hao WANG. A NEW METHOD FOR EVALUATING BRITTLENESS INDEX OF DEEP TIGHT SANDSTONE RESERVOIR[J]. Journal of Geomechanics, 2019, 25(4): 492-500. doi: 10.12090/j.issn.1006-6616.2019.25.04.047
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A NEW METHOD FOR EVALUATING BRITTLENESS INDEX OF DEEP TIGHT SANDSTONE RESERVOIR
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Abstract
Reservoir rock brittleness evaluation is important foundation work for the design of reservoir fracturing reconstruction scheme, which has great influence on reservoir fracturing reconstruction effect. Taking the deep tight sandstone reservoir in the central part of the Junggar Basin as the research object, the rock triaxial test under 0~90 MPa multilevel confining pressure was carried out and the influence of confining pressure variation on brittleness rock was analyzed. In view of the unsatisfactory effect of the existing brittleness index on the evaluation of rock brittleness in target reservoirs, based on the energy conversion relationship in the stress-strain curve, a new brittleness index model, which includes the pre-peak brittleness index, post-peak brittleness index and the comprehensive brittleness index, is established. The results show that the confining pressure has a significant influence on the evaluation of rock brittleness; the pre-peak brittleness increases first and then decreases with the increase of confining pressure, while the post-peak brittleness and comprehensive brittleness decrease monotonously with the increase of confining pressure. The study shows that the brittleness of the reservoir gravel fine sandstone is poorer than that of the fine sandstone, and the brittleness difference is mainly manifested in post-peak brittleness. -
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References
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Huimin LIU, Jinkai ZHENG, Wenshan ZHAO, Zhenjing DU, Jing LI, Hao WANG. A NEW METHOD FOR EVALUATING BRITTLENESS INDEX OF DEEP TIGHT SANDSTONE RESERVOIR[J]. Journal of Geomechanics, 2019, 25(4): 492-500. doi: 10.12090/j.issn.1006-6616.2019.25.04.047
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- Figure 1. Failure of fine sandstone after compressure
- Figure 2. Failure of gravel bearing fine sandstone after compression
- Figure 3. Moire envelope of fine sandstone
- Figure 4. Moire envelope of boulder fine sandstone
- Figure 5. The relationship between peak stress and confining pressure
- Figure 6. Stress-strain curves of fine sandstone
- Figure 7. Stress-strain curves of gravel bearing fine sandstone
- Figure 8. Rock brittle plastic model
- Figure 9. The distribution diagram of brittleness index and confining pressure
- Figure 10. The situation where the brittleness index B4 can not be considered
- Figure 11. BⅠ parameter diagram of brittleness index
- Figure 12. BⅡ parameter diagram of brittleness index
- Figure 13. The relationship between the brittleness index BⅠ, BⅡ and B0 and the confining pressure