南黄海强屏蔽层下富低频强能量气枪震源设计及应用  

Design and application of a high-energy airgun source rich inlow-frequency components under the strong shielding layer in the South Yellow Sea

作　　者：黄福强 陈建文 李斌[1,2] 张异彪 杨佳佳 李珂 HUANG Fu-Qiang;CHEN Jian-Wen;LI Bin;ZHANG Yi-Biao;YANG Jia-Jia;LI Ke(Function Laboratory of Marine Geo-Resource Evaluation and Exploration Technology,Qingdao Marine Science and Technology Center,Qingdao 266237,China;Shanghai Geophysical Branch,Sinopec Offshore Oilfield Services Company,Shanghai 201208,China;Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266237,China)

机构地区：[1]青岛海洋科技中心海洋矿产资源评价与探测技术功能实验室,山东青岛266237 [2]中石化海洋石油工程有限公司上海物探分公司,上海201208 [3]中国地质调查局青岛海洋地质研究所,山东青岛266237

出　　处：《物探与化探》2024年第5期1294-1301,共8页Geophysical and Geochemical Exploration

基　　金：青岛海洋科技中心海洋矿产资源评价与探测技术功能实验室“十四五”重大项目(LSKJ202203404)。

摘　　要：南黄海盆地新近系和中—古生界地层之间存在一个强屏蔽层,阻碍地震波能量向下传播,导致深部地层地震反射波能量低、波组特征差,严重制约了中—古生界油气勘探的突破。为了进一步改善南黄海强屏蔽下中—古生界地层的成像质量,从震源激发端进行大量的模拟分析研究,提出了富低频、强能量震源设计方法,优化设计了6 050 in~3富低频、强能量震源。在崂山隆起西部极浅水区开展了拖缆地震采集,新采集的资料在强屏蔽层下深层的信噪比更高,同相轴更连续,构造特征更清晰,强屏蔽层下的地震资料品质改善明显。A strong shielding layer exists between Neogene and Meso-Paleozoic strata in the South Yellow Sea Basin,hindering the downward propagation of seismic wave energy.Consequently,reflected seismic waves in deep strata manifest low energy and poor wave group characteristics,severely constraining the oil and gas exploration in Meso-Paleozoic strata.To enhance the imaging quality of Meso-Paleozoic strata under the strong shielding layer,this study proposed a method for designing a high-energy airgun source rich in low-frequency components through extensive simulation analyses at the excitation end of the source.Finally,a 6050 in 3 high-energy airgun source rich in low-frequency components was designed and applied to the streamer-based seismic data acquisition in the extremely shallow water area in the western Laoshan uplift.The seismic data acquired in the deep strata under the strong shielding layer demonstrate significantly improved quality,exhibiting a higher signal-to-noise ratio,more continuous seismic events,and clearer structural characteristics.

关 键 词：南黄海 强屏蔽层 大容量 富低频 震源设计 

分 类 号：P631.4[天文地球—地质矿产勘探]