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Induced seismicity risk management: The problem of disappearing faults
AAPG Bulletin ( IF 3.5 ) Pub Date : 2021-02-15 , DOI: 10.1306/07202019242
Doyle R. Watts , Ernest C. Hauser , Mohammad Mohshin , David F. Dominic

The risk of anthropogenic earthquakes created by fluid injection and completion of horizontal wells is managed using maps of recent seismicity and by creating buffer zones around previously mapped faults. In Madison and Fayette Counties, Ohio, faults were identified in 1969 using analogue paper-recorded seismic reflection technology. These faults were located primarily by mapping a prominent “Conasauga reflector” from a shale within the subsurface Cambrian section. The faults were associated with an apparent abrupt increase of the regional dip to the east. The appearance of these faults on subsequent structural maps guides regulation of horizontal drilling activity in Ohio. A time-migrated, nominal 60-fold, mini-hole-sourced, seismic section using a digital recorder with 24-bit sigma delta technology was acquired over what was reported to be the best constrained of these faults; it revealed no detectable fault or significant change in the regional dip. A synthetic seismogram derived from a sonic log acquired at a nearby well enabled identification of a seismic facies change that was likely mistaken for faulting using the earlier technology. Regulations should consider acquisition parameters and vintage of seismic surveys used to identify faults for induced seismicity risk management.

中文翻译:

诱发地震活动风险管理:断层消失的问题

通过注水和水平井完井而产生的人为地震风险可通过使用近期地震图以及通过在先前绘制的断层周围创建缓冲区来管理。在俄亥俄州的麦迪逊和费耶特县,1969年使用模拟纸质地震记录反射技术确定了断层。这些断层的位置主要是通过在寒武纪地下剖面中的一个页岩上绘制一个突出的“ Conasauga反射器”来定位的。断层与东部地区倾角的明显增加有关。这些断层在随后的构造图上的出现指导了俄亥俄州水平钻井活动的调节。时间迁移的标称60倍微型孔源 据报道,这些断层受到最好的约束,因此采用了具有24位sigma delta技术的数字记录仪的地震剖面。它表明没有发现可探测的断层或区域倾角的明显变化。从附近一口井采集的声波测井得到的合成地震图可以识别地震相变化,而使用早期技术可能会将其误认为是断层。法规应考虑用于确定诱发地震活动性风险管理的断层的采集参数和地震勘测的年份。从附近一口井采集的声波测井得到的合成地震图可以识别地震相变化,而使用早期技术可能会将其误认为是断层。法规应考虑用于确定诱发地震活动性风险管理的断层的采集参数和地震勘测的年份。从附近一口井采集的声波测井得到的合成地震图可以识别地震相变化,而使用早期技术可能会将其误认为是断层。法规应考虑用于确定诱发地震活动性风险管理的断层的采集参数和地震勘测的年份。
更新日期:2021-02-15
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