基于SONIC软件的鄂霍次克海浅表陆坡可燃冰勘探研究

SONIC based gas hydrate exploration in shallow slope of the Okhotsk Sea

运用自主研发设计的SONIC软件,控制深海勘探设备Echo水声探测系统,对位于西北太平洋边缘的鄂霍次克海海底可燃冰甲烷释放情况进行勘探研究。重点对萨哈林岛东面浅表陆坡进行了大规模的水声测扫,通过采集回声信号,应用SONIC软件处理和成像后,实现了海底甲烷气体渗漏点(GF)、冷泉和海床的可视化。在发现甲烷气体渗漏点后,运用SONIC的成像功能,分析冷泉中甲烷气体浓度及形态的变化,运用GPS系统进行实时跟踪与定位,利用重力取样器等采样工具,在多个海域成功采集到了可燃冰岩心样本,并及时进行了分析,得到了该地区可燃冰中的甲烷排放速率和甲烷排放量等数据。另外,通过梳理本次考察的经验,对规范我国可燃冰资源调查方法也会产生积极影响。

We control deep-sea exploration equipment Echo underwater acoustic detection system with self-developed software SONIC to investigate methane release of gas hydrate at Okhotsk Sea of northwest Pacific edge. We perform large- scale acoustic sweep on east slope of Sakhalin Island. We implemented visualization of seabed gas flare（GF）,cold seep and seabed through echo signal collection, processing and imaging via software SONIC. After GF discovery, we analyzed the variation of methane gas concentration and morphology in cold seep through imaging functionality of software SONIC. We successfully collected core samples of gas hydrate in multiple waters with GPS real-time tracking and positioning and gravity sampler, analyzed them in time, and acquired methane emission amount and rate in gas hydrate in the area. Moreover, the investigation experience will have positive effect on normalizing investigation methods of gas hydrate in China.