中文摘要：

珠江口盆地西部文昌凹陷是中国近海重要的油气产区，但该区主要天然气储集层珠海组埋深较深、物性不理想，原有的三维地震资料信噪比低，以致断裂系统难以划分，影响了进一步的勘探目标评价．针对文昌凹陷地质特征的特殊性，我们通过针对性的采集照明度分析，设计更为有利的三维采集方位角进行二次采集．利用两次不同采集方位角地震资料，分析了不同采集方位角对文昌凹陷断层成像及断层阴影压制的影响；提出在规则化处理后的观测系统下，将不同采集方位角地震资料进行一致性匹配处理，对处理后的CMP道集进行合并然后偏移成像，得出新的偏移成像结果具有更好的断层阴影压制能力和更高的断层识别能力．经过实际的资料应用效果对比，在文昌凹陷采用不同方位角地震资料合并成像方法能够明显提高该区域断层分辨率和断层阴影压制能力，为后期的勘探开发提供了可靠依据．

英文摘要：

Wenchang sag, located in the generation area. But the main natural gas west part of PearlMouth basin, it reservoir Zhuhai group is too deep, is a very important hydrocarbon- and its property is not ideal. The original old seismic data is low S/N and fault system is difficult to differentiate, affect the further evaluation of exploration targets. According to the geological features of Wenehang sag, through targeted acquisition illumination analysis, we designed more favorable 3D acquisition geometry to collect new seismic data. Using different acquisition azimuth data, analyze the impact of fault imaging and fault shallow in different acquisition azimuth seismic data of Wenehang sag. Proposed that after geometry normalized, matched different azimuth seismic data, and combined these seismic data. At last, migrated the normalized and combined seismic data in CMP gather, and the new imaging results with better fault shadows suppression capability and higher fault identification capability. After the real seismic data analyzed, multi-azimuth seismic data combined imaging method can obtain a better fault imaging and better fault shadow suppress effect, and provide a reliable basis for later exploration and development.