摘要
近年来,东海西湖凹陷深层构造-岩性复合油气藏勘探开发取得重大进展。原有单船采集窄方位拖缆三维由于深层信噪比低和成像质量差,制约了深层目标识别、储层描述和评价。因此,实施了不同观测系统的拖缆宽方位三维采集。以HY区和BT区两种典型拖缆宽方位三维采集为例,对各自采集属性、不同方位数据对深层成像质量改善贡献进行对比分析。研究认为拖缆宽方位三维采集得到的方位分布是比较稀疏的;在窄方位采集条件下,通过减小面元、加长电缆长度、提高覆盖次数等得到的高密度拖缆三维数据对研究区深层成像改善是较有限的;更宽方位数据有利于深层成像改善。西湖凹陷下步可以采用更宽方位和更高信噪比的OBN(Ocean Bottom Node)采集技术,该研究对于西湖凹陷地震采集方案选择具有参考意义。
In recent years,great progress has been made in the deep structural-lithological reservoir exploration and development in Xihu Sag,East China Sea.Du to low signal-to-noise-ratio and imaging challenges,the legacy 3D data acquired by NATS(narrow azimuth towed streamer)with one vessel restricted the identification,description and evaluation of deep targets.So sereral WATS(wide azimuth towed streamer)acquisitions with different configurations were carried out.As typical examples,HY WATS and BT WATS are used for making analysis on acquisition attributes and comparisons of contributions to imaging of deep targets with different azimuths.The results demonstrate that the azimuths of the existing WATS appear much sparser;under the conditions of narrow azimuth(NAZ),the high density tower streamer 3D data by smaller cell size,longer cable and higher fold will provide a limited improvement of imaging of deep targets;the wider azimuthal data can improve deep imaging.OBN acquisition technology with wider azimuth and higher signal-to-noise ratio can be adopted in the next step in Xihu Sag.The study has reference significance for the selection of seismic acquisition schemes in Xihu Sag.
作者
陈茂根
牛华伟
刘苗
朱宝衡
李玉剑
蒋涔
CHEN Maogen;NIU Huawei;LIU Miao;ZHU Baoheng;LI Yujian;JIANG Cen(SINOPEC Shanghai Offshore Oil&Gas Company,Shanghai 200120,China)
出处
《海洋石油》
CAS
2023年第4期46-52,共7页
Offshore Oil
