Monitoring spatiotemporal evolution of fractures during hydraulic stimulations at the first EGS collab testbed using anisotropic elastic-waveform inversion

IF 3.5 2区工程技术 Q3 ENERGY & FUELS

Geothermics Pub Date : 2024-06-18 DOI:10.1016/j.geothermics.2024.103076

Zongcai Feng , Lianjie Huang , Benxin Chi , Kai Gao , Jiaxuan Li , Jonathan Ajo-Franklin , Douglas A. Blankenship , Timothy J. Kneafsey , The EGS Collab Team

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引用次数: 0

Abstract

The EGS Collab project acquired continuous active-source seismic monitoring (CASSM) data before, during, and after hydraulic stimulations at the first testbed at the depth of 4850 ft (1478 m) at the Sanford Underground Research Facility in Lead, South Dakota, for monitoring fracture creation and evolution. CASSM acquisition was conducted using 24 hydrophones, 18 accelerometers, and 17 piezoelectric sources within four fracture-parallel wells and two orthogonal wells. 3D anisotropic traveltime tomography and anisotropic elastic-waveform inversion of the campaign cross-borehole seismic data show that the rock within the stimulation region is a heterogeneous horizontal transverse isotropic medium. We use these inversion results as the initial models and apply 3D anisotropic first-arrival traveltime tomography and 3D anisotropic elastic-waveform inversion to the CASSM data acquired after each stimulation in May, 2018 and December, 2018. We observe the spatiotemporal evolution of seismic velocities and anisotropic parameters caused by hydraulic fracture stimulations, showing the regions of rock alternation caused by hydraulic fracture stimulation.

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利用各向异性弹性波形反演监测首个 EGS 协作试验台水力刺激过程中裂缝的时空演变

EGS Collab 项目在南达科他州利德桑福德地下研究设施 4850 英尺（1478 米）深处的第一个试验台进行水力刺激之前、期间和之后采集了连续主动源地震监测（CASSM）数据，用于监测裂缝的形成和演化。CASSM 采集使用了 24 个水听器、18 个加速度计和 17 个压电源，分布在四个压裂平行井和两个正交井中。活动跨井眼地震数据的三维各向异性走时层析成像和各向异性弹性波形反演表明，激励区域内的岩石是一种异质水平横向各向同性介质。我们将这些反演结果作为初始模型，并将三维各向异性初至旅行时间层析成像和三维各向异性弹性波形反演应用于 2018 年 5 月和 2018 年 12 月每次激励后获取的 CASSM 数据。我们观察了水力压裂激励引起的地震速度和各向异性参数的时空演化，显示了水力压裂激励引起的岩石交替区域。

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来源期刊

Geothermics 工程技术-地球科学综合

CiteScore

7.70

自引率

15.40%

发文量

237

审稿时长

4.5 months

期刊介绍： Geothermics is an international journal devoted to the research and development of geothermal energy. The International Board of Editors of Geothermics, which comprises specialists in the various aspects of geothermal resources, exploration and development, guarantees the balanced, comprehensive view of scientific and technological developments in this promising energy field. It promulgates the state of the art and science of geothermal energy, its exploration and exploitation through a regular exchange of information from all parts of the world. The journal publishes articles dealing with the theory, exploration techniques and all aspects of the utilization of geothermal resources. Geothermics serves as the scientific house, or exchange medium, through which the growing community of geothermal specialists can provide and receive information.