高精度电缆采集系统在南黄海崂山隆起油气调查中的应用

Application of high precision marine seismic streamer acquisition system to Laoshan uplift of South Yellow Sea

南黄海盆地崂山隆起区中、古生界地层发育,为南黄海盆地有利勘探区域。但由于区域性的高速屏蔽层的存在,导致地震波能量难以下传,中-古生界地震成像效果较差,信噪比低。针对该问题,选取高精度地震采集技术,采用国产"海亮"高精度电缆采集系统在崂山隆起区域实施了地震采集,以达到增加空间采样率的目的,同时优化采集参数,提高目的层成像效果。实践表明,该方案明显提高了南黄海崂山隆起地区地震资料的品质,中-古生界成像获得改善,为该区中-古生界勘探提供了优质的基础资料。

Marine Mesozoic-Paleozoic strata,as a favorable exploration target,are well developed on the Laoshan uplift of South Yellow Sea Basin.However,due to the existence of seismic shield at the bottom of the Cenozoic,seismic waves are difficult to penetrate through the boundary,that have caused the decrease in image quality and signal-noise ratio of seismic profiles.In order to improve the quality of seismic data,the domestic＂HQI-Seis＂high-precision streamer acquisition system was adopted in this project to increase the spatial sampling rate and improve the signal to noise ratio.At the same time,proper acquisition parameters are designed and optimized for the same purpose.The practice proves that the endeavor has obviously improved the quality of seismic data and Mesozoic images from the Laoshan uplift and it is certainly helpful to Mesozoic exploration in this region.