双船双方位角地震探测技术方法及应用效果

doi:10.11978/2017033

Abstract

Abstract:

In Dongsha slope of the South China Sea, shallow fracture and reefs are numerous. Shallow Cenozoic is composed of carbonate rocks. The internal structure of deep Mesozoic is complex, with a lot of fracture. The conventional single vessel narrow azimuth seismic section shows poor reflection quality in deep sea. Dual vessels can be used to design flexible observation geometry, such as dual-azimuth seismic exploration. For the same reflection point lighting, this method of dual-azimuth seismic exploration is better than the narrow azimuth detection beneath the high acoustic velocity layer and the steep dip angle layer. Through key technology research and development, the dual-azimuth seismic acquisition was carried out by using single source and two streamers on both sides. We successfully implemented the experiment for the deep target seismic exploration in the South China Sea.

Key words: dual-vessel seismic survey, dual-azimuth, observation geometry, acquisition parameter, synthetic array profile

CLC Number:

P715.3

Shuji YANG, Chenglong WEI, Zhongliang WU, Xielai LIU, Ce YANG, Cong WANG. Dual-azimuth seismic survey technology and application using dual vessels[J].Journal of Tropical Oceanography, 2018, 37(1): 98-104.

Figures/Tables 7

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References 13

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采集参数	“奋斗四号”船	“探宝号”船
两船相对位置	副船(前)	主船(后)
两船电缆道最小距离/m	2475	2475*
船偏线范围/m	±25	±25*
震源容量/m³	无	0.105
气枪压力/MPa	13.8	13.8*
放炮间隔/m	37.5	37.5*
震源深度/m	无	等效深度8.5m
激发延迟/ms	无	1&4子阵列延迟2ms
电缆道数	360	480
道间距/m	6.25	12.5
电缆深度/m	16	16
最小偏移距/m	2250	225
覆盖次数	30	80

Dual-azimuth seismic survey technology and application using dual vessels

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