高密度宽方位深拖地震采集技术在西湖凹陷的应用

Application of High Density and Wide Azimuth Seismic Acquisition Technology with Deep-tow in Xihu Sag

黄福强 张异彪 李斌 冯奇坤 胡斌 王付洁

HUANG Fuqiang ZHANG Yibiao LI Bin FENG Qikun HU Bin WANG Fujie

中石化海洋石油工程有限公司上海物探分公司, 上海 201208

Shanghai Geophysical Branch, Sinopec Offshore Oilfield Services Company, Shanghai 201208, China

西湖凹陷是东海陆架盆地主要的含油气凹陷，具有主力储层埋藏深、断裂系统复杂、储层横向变化大等特点。原有地震资料的中深层信噪比偏低、方位角较窄、横向采样密度不够，难以满足中深层精确成像和储层描述的需求。此文在分析原有资料的基础上，论证了高密度宽方位深拖地震采集技术，介绍了该技术在西湖凹陷的最新应用效果。结果表明，新资料比老资料具有更好的成像质量。结论认为：采用高密度宽方位深拖地震采集技术，可以得到更小的面元、更高的覆盖次数、更多的低频信息和更宽的方位角，有利于提高中深部地层的反射能量、信噪比，改善断裂系统的成像质量，为储层描述及油气预测提供可靠的地震资料。

Xihu Sag is the main hydrocarbon-rich area in the East China Sea shelf basin, which has the characteristics of deep burial of main reservoirs, complex fault system and large lateral variation of reservoirs. The original seismic data has low signal-to-noise ratio, narrow azimuth and insufficient transverse sampling density. Consequently, it is difficult to meet the needs of accurate imaging and reservoir description. Based on the analysis of the original data, this paper demonstrates the high density and wide azimuth seismic acquisition technology with deep-tow, and introduces the latest application effect in Xihu Sag. The results show that the new data has better imaging quality than the original data. It is concluded that the application of the new acquisition technology can obtain smaller bin size, higher fold, more low frequency information and wider azimuth, which is beneficial to improve the reflection energy, signal-to-noise ratio of deep and middle targets and the imaging quality of faults. As a result, the reliable seismic data for reservoir description and hydrocarbon prediction can be provided.

本项研究受国家专项科研项目《东海深层低渗-致密天然气勘探开发技术》课题二《深层大中型气田勘探评价技术集成及应用》任务4《深层立体震源-斜缆-OBS联合二维地震采集处理技术》（2016ZX05027-002-004）资助。

https://doi.org/10.3969/j.issn.1008-2336.2019.04.001