3D geomechanical modeling of the response of the Wilzetta Fault to saltwater disposal

IF 2.9 3区 地球科学
Behzad Hemami, Shahla Feizi Masouleh, Ahmad Ghassemi
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引用次数: 7

Abstract

From 2009 to 2017, parts of Central America experienced marked increase in the number of small to moderate-sized earthquakes. For example, three significant earthquakes (~Mw 5) occurred near Prague, Oklahoma, in the U. S. in 2011. On 6 Nov 2011, an Mw 5.7 earthquake occurred in Prague, central Oklahoma with a sequence of aftershocks. The seismic activity has been attributed to slip on the Wilzetta fault system. This study provides a 3D fully coupled poroelastic analysis (using FLAC3D) of the Wilzetta fault system and its response to saltwater injection in the underpressured subsurface layers, especially the Arbuckle group and the basement, to evaluate the conditions that might have led to the increased seismicity. Given the data-limited nature of the problem, we have considered multiple plausible scenarios, and use the available data to evaluate the hydromechanical response of the faults of interest in the study area. Numerical simulations show that the injection of large volumes of fluid into the Arbuckle group tends to bring the part of the Wilzetta faults in Arbuckle group and basement into near-critical conditions.

Abstract Image

Wilzetta断层对盐水处理响应的三维地质力学建模
从2009年到2017年,中美洲部分地区的中小地震数量明显增加。例如,2011年在美国俄克拉何马州布拉格附近发生了三次大地震(~ 5兆瓦)。2011年11月6日,俄克拉何马州中部布拉格发生5.7级地震,并伴有一系列余震。地震活动归因于威尔泽塔断层系统的滑动。本研究对Wilzetta断裂系统进行了三维全耦合孔隙弹性分析(使用FLAC3D),并分析了其对欠压次表层(特别是Arbuckle组和基底)盐水注入的响应,以评估可能导致地震活动性增加的条件。考虑到问题的数据有限的性质,我们考虑了多种可能的情况,并使用可用的数据来评估研究区域中感兴趣的断层的流体力学响应。数值模拟结果表明,大量流体进入Arbuckle群,会使Arbuckle群中的部分Wilzetta断裂和基底进入近临界状态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Earth and Planetary Physics
Earth and Planetary Physics GEOSCIENCES, MULTIDISCIPLINARY-
自引率
17.20%
发文量
174
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