【摘要】 利用大容量气枪枪阵震源和海底地震仪在渤海首次开展人工地震深部地球物理探测试验。本次试验布设一条NWW-SEE向垂直构造走向的勘测线,共投放海底地震仪51台,回收成功50台。试验结果和数据分析表明,所使用的枪阵有足够的能量输出,海底地震仪记录震相丰富,可识别到Ps,Pg,PmP,Pn等多种震相。初至波层析成像结果表明,9 km以上地层速度结构存在明显的横向不均匀性,渤中地区新生代沉积基底埋深5～6 km,结晶基底埋深约9 km,郯庐断裂带内存在"U"型下凹的相对低速体并有向下切割的趋势。此次试验是我国在渤海深部探测中的成功示范,有效填补了渤海海域深地震测深数据的空白,为渤海深部地壳结构研究及含油气盆地形成演化研究提供了重要的基础资料。更多还原

【Abstract】 A deep seismic sounding experiment was carried out for the first time in the Bohai Sea using large volume air-gun array and Ocean Bottom Seismometers(OBSs).Fifty-one OBSs were deployed along a NWW-SEE line perpendicular to the strikes of the regional tectonics and fifty were recovered successfully.Experiment outcome showed the air-gun array used during the experiment had enough power;primary data analysis indicated the OBSs recorded rich seismic phases including Ps,Pg,PmP and Pn.Initial first arrival tomography results show that the shallow layer with depth of less than 9 km has obvious heterogeneity in the lateral direction,the depth of the Cenozoic sedimentary basement is 5~6 km in the Bozhong area and the corresponding crystalline basement depth is about 9 km,and an U-shaped lower velocity body which has the trend to cut through the lower layer can be found in the Tanlu fault zone.This experiment is a successful case of the deep structure exploration in the Bohai Sea.It not only fills in the blanks of deep seismic sounding database,but also supplies fundamental information for the research of deep crustal structure around Bohai area and the development of Bohai Bay Basin.更多还原