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潮汕坳陷是中生界地层为主的沉积坳陷,被认为是南海油气勘探的重要勘探领域。潮汕坳陷已有丰富的多道反射地震资料,但是由于多次波干扰严重,获取的反射波速度精度低。潮汕坳陷多道反射地震资料中包含丰富的折射波数据,但是很少人重视多道地震记录中的折射波信息并利用他。在此我们通过编写处理程序拾取了折射层的地震速度。试验测线所在海区的水深在600—800m,测线的最大偏移距为6 250m。测线所测的第三系地震折射波速度为2.0—2.5km.s-1,与潮汕坳陷其他地方的第三系地震波速度基本相等。但是潮汕坳陷西南部中生界的地震折射波速度在3.5—4.2km.s-1,低于潮汕坳陷中东部中生界的地震波速度(4.0—5.0km.s-1),预示潮汕坳陷西南部油气储集物性可能较好。
The Chaoshan Depression is a sedimentary depression dominated by the Mesozoic strata. It is considered as an important exploration area for oil and gas exploration in the South China Sea. There are abundant multi-channel reflection seismic data in the Chaoshan Depression. However, due to the multiple interference, the acquired reflected wave velocity has low accuracy. The multi-channel reflection seismic data of Chaoshan Depression contains rich refraction wave data, but few people pay attention to the refraction wave information in multi-channel seismograms and use it. Here we pick up the seismic velocity of the refraction layer by writing a handler. The depth of the sea where the test line is located is 600-800 m and the maximum offset of the line is 6 250 m. The refractive index velocity of Tertiary earthquake measured by the survey line is 2.0-2.5km.s-1, which is basically the same as the Tertiary seismic velocity in other parts of the Chaoshan Depression. However, the seismic reflection wave velocity of the Mesozoic in the southwestern part of Chaoshan Depression is 3.5-4.2 km.s-1, which is lower than the seismic velocity (4.0-5.0 km.s-1) of the Mesozoic in the middle and eastern part of the Chaoshan Depression, Reservoir properties in the southwestern depression may be better.