We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Regional Characteristics of Seismicity Associated with Hydraulic Fracturing in the Southern Sichuan Basin of China.
- Authors
Dai, Jingjing; Liu, Jianfeng; Liu, Changwu; Yang, Jianxiong; Xue, Fujun; Tang, Yifan; Liu, Junjie; Liu, Dehang; Dai, Shigui
- Abstract
In the southern Sichuan Basin of China (SSBC), hydraulic fracturing (HF) production of shale gas and surface buildings have been seriously affected by some medium scale (local magnitude ML > 4.0) earthquake events. In this study, focusing on relocated hypocenters in SSBC from January 2016 to May 2017, the Density-Based Spatial Clustering of Applications with Noise algorithm was introduced to divide it into four seismic regions. The temporal evolution of seismicity parameters, detailed views of potential faults near injection wells and spatial migration of seismic activity in each region were obtained. Moreover, the statistical correlation between seismicity and engineering disturbance was calculated by adopting epidemic type aftershock sequence model (ETAS); the relationship between corner frequency, stress drop and seismic moment of each region were analyzed, and the spatial distribution of the stress drop, the relationship with the focal mechanism solutions (ML > 3.5) and the fault slip-tendency under the regional stress pattern were discussed. The results show that the seismic diffusion rate of each region can be well described by the square root envelope (0.3–0.8 m2/s) and seismicity has a strong cluster mode (triggered events) and a weak background mode (independent events). Most (more than 97.5%) of the stress drops are in the range of 0.1–10 MPa, and the high stress drops is mainly located in the YS108 shale block; under the current regional stress pattern, the faults in region YS108 are unfavorablely oriented, while those in the south of N201 are favorablely oriented, with a high sliding trend. This knowledge may provide time to take mitigating actions to reduce the potential for damaging earthquakes. Highlights: Spatial clustering in SSBC based on DBSCAN algorithm and the relocated hypocenters associated with hydraulic fracturing, and the spatiotemporal migration characteristics are analyzed. Focal mechanisms indicate different fault planes, matching well with relocated hypocenters Statistical relationship between source parameters (corner frequency, stress drop, seismic moment, etc.) and regional variations Discuss the slip-tendency of potential faults in various regions under inversion of current stress pattern
- Publication
Rock Mechanics & Rock Engineering, 2024, Vol 57, Issue 9, p6971
- ISSN
0723-2632
- Publication type
Article
- DOI
10.1007/s00603-024-03891-w