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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。
The first large-scale geophysical exploration of geophysics was conducted in the Bohai Sea using a large-volume air gun gun array source and seabed seismometer. In this experiment, a NWW-SEE survey line oriented toward the vertical structure was laid. A total of 51 seabed seabed stations were put into operation, of which 50 were successfully recovered. Experimental results and data analysis show that the gun array used has enough energy output and the seabed seismograph has abundant seismic phases and can identify Ps, Pg, PmP, Pn and other phases. The results of the first arrival wave tomography show that there is obvious lateral inhomogeneity in the velocity structure above 9 km. The Cenozoic sedimentary basement is 5 ~ 6 km deep in Bozhong area, and the buried depth of crystalline basement is about 9 km. The memory of the Tanlu fault zone In the “U” type concave lower relative speed body and there is a downward trend. This experiment is a successful demonstration of our country’s deep exploration in the Bohai Sea. It effectively filled in the blank of the deep seismic sounding data in the Bohai Sea, and provided important basic data for the study of the deep crustal structure in the Bohai Sea and the study on the formation and evolution of the oil-bearing basins.