双船双方位角地震探测技术方法及应用效果

doi:10.11978/2017033

热带海洋学报 ›› 2018, Vol. 37 ›› Issue (1): 98-104.doi: 10.11978/2017033CSTR: 32234.14.2017033

• • 上一篇

双船双方位角地震探测技术方法及应用效果

杨蜀冀^1,²(), 韦成龙^1,²(), 伍忠良^1,², 刘协来³, 杨册^1,², 王聪^1,²

1. 国土资源部海底矿产资源重点实验室, 广东广州 510075
2. 广州海洋地质调查局, 广东广州 510760
3. 北京晶格恒信科技发展有限公司, 北京 100032

收稿日期:2017-03-27 修回日期:2017-04-29 出版日期:2018-01-20 发布日期:2018-02-02
作者简介:
作者简介：杨蜀冀(1973—), 男, 广东省广州市人, 工程师, 学士, 从事海洋地球物理探测与技术方法研究。Email: yyy1973yyy@sina.com
基金资助:
国家海洋地质保障工程项目(GZH201200508)

Dual-azimuth seismic survey technology and application using dual vessels

Shuji YANG^1,²(), Chenglong WEI^1,²(), Zhongliang WU^1,², Xielai LIU³, Ce YANG^1,², Cong WANG^1,²

1. Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou 510075, China
2. Guangzhou Marine Geological Survey, Guangzhou 510760, China
3. Beijing Jinggehengxin Co. Ltd, Beijing 100032, China

Received:2017-03-27 Revised:2017-04-29 Online:2018-01-20 Published:2018-02-02
Supported by:
Natural Marine Geology Security Engineering (GZH201200508)

摘要/Abstract

摘要：

南海东沙海域的陆坡台地区, 浅表断裂及生物礁发育众多, 浅层新生界多为碳酸盐岩层, 中深层的中生界内部构造复杂, 断裂较多, 常规单船窄方位地震剖面显示中深层反射品质较差。利用双船可以设计灵活的观测系统, 形成双方位角地震探测方式, 对于地下同一反射点的照明, 可以获得比窄方位角探测更好的效果, 也可以改善高速屏蔽层下方、高陡倾角斜层等区域的成像质量。文章通过重点技术的攻关研发, 进行了单源激发、双缆接收的双方位角采集试验, 成功实现该方法在南海海域中深层地震勘探中的应用。

关键词: 双船地震, 双方位角, 观测系统, 采集参数, 合成剖面

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

中图分类号:

P715.3

杨蜀冀, 韦成龙, 伍忠良, 刘协来, 杨册, 王聪. 双船双方位角地震探测技术方法及应用效果[J]. 热带海洋学报, 2018, 37(1): 98-104.

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.

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参考文献 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

双船双方位角地震探测技术方法及应用效果

Dual-azimuth seismic survey technology and application using dual vessels

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