海洋地质与第四纪地质2024，Vol.44Issue(6)：12-24,13.DOI:10.16562/j.cnki.0256-1492.2024090903
琼东南海域冷泉微地震响应特征初探
Preliminary study on microseismic response characteristics of cold seep in Qiongdongnan sea area:A case study of"Haima"cold seep
摘要
Abstract
During the migration,fluid in the cold seep system of the submarine natural gas hydrate area will impact the shallow strata,causing the fluid material in the lower strata to undergo a"solid-liquid-gas"transformation.The energy released could cause fracture collapse and pore rupture,thereby generating a series of vibration events.These microseismic signals can visually and accurately reflect the growth and development status and life cycle of the cold seep system,and reveal the laws of its fluid escape activities.We studied the microseismic data monitored at two different times in 2014 and 2021 near the Haima cold seep area in the Qiongdongnan waters.After preprocessing the data,a large number of microseismic events related to cold seep activities were identified using the STA/LTA(short term average/long term average)method.By analyzing the characteristics of waveform,spectrum,and time distribution of these microseismic signals,the response characteristics of the cold seep microseismic events in the natural gas hydrate area in the Qiongdongnan waters were clarified.Preliminary research results show that the microseismic events generated by the cold seep activity in the Haima cold seep area include short duration events and typical cold seep microseismic signals;the tail of the waveform shows a regular and exponential-like decay,with a duration of 0.3～2 s and a main frequency range of 4～26 Hz.There is no obvious tidal-like time distribution pattern for cold seep microseismic activity,and it mostly shows the characteristics of short-term concentrated distribution,which may be related to the activity and strength of the cold seep vents.关键词
天然气水合物/"海马"冷泉/微地震事件/短时信号/琼东南海域Key words
natural gas hydrate/Haima cold seep/microseismic events/short duration event/Qiongdongnan sea area分类
海洋科学引用本文复制引用
胡广,黄建宇,杨胜雄,李沅衡,田冬梅,曹荆亚,周军明,邓雨恬..琼东南海域冷泉微地震响应特征初探[J].海洋地质与第四纪地质,2024,44(6):12-24,13.基金项目
国家自然科学基金"南海北部高富集天然气水合物储层特征与成藏控制机理研究"(U2244224) （U2244224）
广州市基础研究计划与基础应用研究项目"基于深度学习的冷泉羽状流地震资料高分辨率处理方法研究"(2023A04J0917) （2023A04J0917）
南方海洋科学与工程广东省实验室(广州)引进高端人才项目(GML2020GD0802) （广州）
