中国西南四川盆地威远页岩气区块的地壳电性结构与地震活动性

IF 1.6 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Yingxing Guo, Tao Zhu, Xingbing Xie, Lei Zhou
{"title":"中国西南四川盆地威远页岩气区块的地壳电性结构与地震活动性","authors":"Yingxing Guo, Tao Zhu, Xingbing Xie, Lei Zhou","doi":"10.1093/jge/gxad100","DOIUrl":null,"url":null,"abstract":"Hydraulic fracturing, a significant contributor to seismic activity within and around operational fields, has been extensively employed in shale gas production. Magnetotelluric Sounding (MT) as an effective geophysical tool for identifying high-conductivity fluid-filled and/or molten regions. In this study, we deploy a dense grid of rectangular MT sites to investigate the three-dimensional (3-D) geoelectrical resistivity structure beneath the Weiyuan shale gas block (WSGB) and subsequently examine the causes of seismic activity. The resistivity data, obtained through 3-D inversion accounting for topography using ModEM, reveals a shallow low-resistivity layer (< 10 Ω-m) within the WSGB, ranging from approximately 2 to 5 km in depth. This layer exhibits multiple isolated areas with very low resistivity (< 5 Ω-m), indicative of fluid-filled zones associated with hydraulic fracturing or shale gas-bearing formations. In the northwestern WSGB, the Weiyuan anticline presents a high-resistivity dome extending possibly to depths beyond 20 km, without extending beyond the northern boundary of our study area. Conversely, the sedimentary zone in the southeastern WSGB displays a low-resistivity feature, with an extremely low-resistivity center (< 1 Ω-m). Since a consistent high resistivity zone exists beneath each fault and its top depth is less than 5 km, so faults might not extend downward below 5 km. Earthquakes with magnitudes (ML) of 3.0 or higher predominantly occur close to the faults, when considering industrial production data, we found a noteworthy correlation between earthquakes with ML < 3.0 and annual shale gas production within the WSGB. Tectonic faulting is not the leading cause for ML < 3.0 earthquakes but likely the primary contributor to seismic events with ML ≥ 3.0.","PeriodicalId":54820,"journal":{"name":"Journal of Geophysics and Engineering","volume":"115 8","pages":""},"PeriodicalIF":1.6000,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Crustal electrical structure and seismicity of the Weiyuan shale gas block in Sichuan basin, southwest China\",\"authors\":\"Yingxing Guo, Tao Zhu, Xingbing Xie, Lei Zhou\",\"doi\":\"10.1093/jge/gxad100\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Hydraulic fracturing, a significant contributor to seismic activity within and around operational fields, has been extensively employed in shale gas production. Magnetotelluric Sounding (MT) as an effective geophysical tool for identifying high-conductivity fluid-filled and/or molten regions. In this study, we deploy a dense grid of rectangular MT sites to investigate the three-dimensional (3-D) geoelectrical resistivity structure beneath the Weiyuan shale gas block (WSGB) and subsequently examine the causes of seismic activity. The resistivity data, obtained through 3-D inversion accounting for topography using ModEM, reveals a shallow low-resistivity layer (< 10 Ω-m) within the WSGB, ranging from approximately 2 to 5 km in depth. This layer exhibits multiple isolated areas with very low resistivity (< 5 Ω-m), indicative of fluid-filled zones associated with hydraulic fracturing or shale gas-bearing formations. In the northwestern WSGB, the Weiyuan anticline presents a high-resistivity dome extending possibly to depths beyond 20 km, without extending beyond the northern boundary of our study area. Conversely, the sedimentary zone in the southeastern WSGB displays a low-resistivity feature, with an extremely low-resistivity center (< 1 Ω-m). Since a consistent high resistivity zone exists beneath each fault and its top depth is less than 5 km, so faults might not extend downward below 5 km. Earthquakes with magnitudes (ML) of 3.0 or higher predominantly occur close to the faults, when considering industrial production data, we found a noteworthy correlation between earthquakes with ML < 3.0 and annual shale gas production within the WSGB. Tectonic faulting is not the leading cause for ML < 3.0 earthquakes but likely the primary contributor to seismic events with ML ≥ 3.0.\",\"PeriodicalId\":54820,\"journal\":{\"name\":\"Journal of Geophysics and Engineering\",\"volume\":\"115 8\",\"pages\":\"\"},\"PeriodicalIF\":1.6000,\"publicationDate\":\"2023-11-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Geophysics and Engineering\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1093/jge/gxad100\",\"RegionNum\":3,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"GEOCHEMISTRY & GEOPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Geophysics and Engineering","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1093/jge/gxad100","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
引用次数: 0

摘要

水力压裂法是造成作业区内部和周围地震活动的重要因素,已被广泛用于页岩气生产。磁电探测(MT)是一种有效的地球物理工具,可用于识别高导流体填充区和/或熔融区。在本研究中,我们部署了密集的矩形 MT 网格,以调查威远页岩气区块(WSGB)地下的三维(3-D)地质电阻率结构,并随后研究地震活动的原因。利用 ModEM 对地形进行三维反演获得的电阻率数据揭示了威远页岩气区块内的浅层低电阻率层(< 10 Ω-m),深度约为 2 至 5 千米。该层表现出多个孤立的极低电阻率区域(< 5 Ω-m),表明是与水力压裂或页岩气含气层相关的充液区。在 WSGB 西北部,威远反斜线呈现出一个高电阻率圆顶,可能延伸到 20 公里以外的深度,但没有超出我们研究区域的北部边界。相反,WSGB 东南部沉积带则呈现低电阻率特征,中心电阻率极低(< 1 Ω-m)。由于每条断层下都存在一个一致的高电阻率区,且其顶部深度小于 5 千米,因此断层可能不会向下延伸至 5 千米以下。震级 (ML) 为 3.0 或更高的地震主要发生在断层附近,在考虑工业生产数据时,我们发现 ML < 3.0 的地震与 WSGB 内页岩气年产量之间存在显著的相关性。构造断层不是 ML < 3.0 地震的主要原因,但可能是 ML ≥ 3.0 地震事件的主要促成因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Crustal electrical structure and seismicity of the Weiyuan shale gas block in Sichuan basin, southwest China
Hydraulic fracturing, a significant contributor to seismic activity within and around operational fields, has been extensively employed in shale gas production. Magnetotelluric Sounding (MT) as an effective geophysical tool for identifying high-conductivity fluid-filled and/or molten regions. In this study, we deploy a dense grid of rectangular MT sites to investigate the three-dimensional (3-D) geoelectrical resistivity structure beneath the Weiyuan shale gas block (WSGB) and subsequently examine the causes of seismic activity. The resistivity data, obtained through 3-D inversion accounting for topography using ModEM, reveals a shallow low-resistivity layer (< 10 Ω-m) within the WSGB, ranging from approximately 2 to 5 km in depth. This layer exhibits multiple isolated areas with very low resistivity (< 5 Ω-m), indicative of fluid-filled zones associated with hydraulic fracturing or shale gas-bearing formations. In the northwestern WSGB, the Weiyuan anticline presents a high-resistivity dome extending possibly to depths beyond 20 km, without extending beyond the northern boundary of our study area. Conversely, the sedimentary zone in the southeastern WSGB displays a low-resistivity feature, with an extremely low-resistivity center (< 1 Ω-m). Since a consistent high resistivity zone exists beneath each fault and its top depth is less than 5 km, so faults might not extend downward below 5 km. Earthquakes with magnitudes (ML) of 3.0 or higher predominantly occur close to the faults, when considering industrial production data, we found a noteworthy correlation between earthquakes with ML < 3.0 and annual shale gas production within the WSGB. Tectonic faulting is not the leading cause for ML < 3.0 earthquakes but likely the primary contributor to seismic events with ML ≥ 3.0.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
Journal of Geophysics and Engineering
Journal of Geophysics and Engineering 工程技术-地球化学与地球物理
CiteScore
2.50
自引率
21.40%
发文量
87
审稿时长
4 months
期刊介绍: Journal of Geophysics and Engineering aims to promote research and developments in geophysics and related areas of engineering. It has a predominantly applied science and engineering focus, but solicits and accepts high-quality contributions in all earth-physics disciplines, including geodynamics, natural and controlled-source seismology, oil, gas and mineral exploration, petrophysics and reservoir geophysics. The journal covers those aspects of engineering that are closely related to geophysics, or on the targets and problems that geophysics addresses. Typically, this is engineering focused on the subsurface, particularly petroleum engineering, rock mechanics, geophysical software engineering, drilling technology, remote sensing, instrumentation and sensor design.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信