物探化探计算技术2017，Vol.39Issue(1)：90-95,6.DOI:10.3969/j.issn.1001-1749.2017.01.13
水力压裂微地震监测稳定共振频率信号的解释
Interpretation of stable resonance frequency signals observed from microseismic monitoring during hydraulic fracturing
摘要
Abstract
During hydraulic fracturing, induced microseismic events are generally monitored by surface or downhole geophones to determine their locations from which the stimulated reservoir volume can be estimated. In a surface microseismic monitoring experiment carried out in Deyang of Sichuan province, microseismic events are not detected due to strong near surface attenuation and background noise. Instead, we detected continuous signals with stable resonance frequencies, which are well correlated with slurry flow. This kind of signals have been detected in other hydraulic fracturing monitoring cases and are interpreted as the Stonley waves by the interaction of high-pressure fluids with the surrounding fractures (Tary et al., 2014). In our case, through the time-frequency analysis we can obtain how frequency and amplitude of these resonant signals change with time at different stations. For the ~13 Hz resonant signal, its amplitude generally decreases at stations farther away from the well site, indicating that the signal is most likely originated from the surface well site. As a result, by using these stable resonant signals, it could provide us a way to monitor the vibration condition of high-pressure pipes used for hydraulic fracturing. Based on these facts, we propose that these resonant signals are caused by vibrations of high-pressure pipes triggered by periodic pressure pulses of triplex pumps. We further suggest that the interpretation of these resonant signals due to Stonely waves or nonlaminar flows by Tary et al. (2014) may be wrong based on several contradictive points with observations. They are also likely caused by vibrations of high-pressure pipes, similar to what we derived from our experiments.关键词
水力压裂/共振信号/高压管线振动/斯通利波/非层流Key words
hydraulic fracturing/resonant signals/vibration of high-pressure pipes/Stonely wave/nonlaminar flow分类
天文与地球科学引用本文复制引用
于辉,张海江..水力压裂微地震监测稳定共振频率信号的解释[J].物探化探计算技术,2017,39(1):90-95,6.基金项目
自然科学基金项目(41274055) （41274055）
