An accurate elastic beam migration method without slant stack for complex surface and subsurface geological conditions

作者：Huang Jianping; Yuan Maolin^*; Li Zhenchun; Fang Wubao; Yue Yubo

来源：Geophysical Prospecting for Petroleum, 2015, 54(1): 56-63.

DOI：10.3969/j.issn.1000-1441.2015.01.008

• Angle domains
• Beam migration
• Dual complexity
• Elastic gaussian beams
• Exploration and exploitation
• Geological conditions
• Multicomponent datum
• Non slant stack

Today, since the development trend of exploration and exploitation is gradually transferring to dual-complexity areas, the imaging based on unseparated multi-wave multi-component dataset has become a conundrum in the data processing. Based on surface dip-angle information and seismic data without slant stack, elastic dynamic Gaussian beams are emitted directly on complex surface and then decoupled backward-continued vector wavefield can be calculated. According to the cross-correlation imaging condition and polarization features of vector wavefield, PP and converted PS imaging are implemented. Finally, polarity reversal in converted PS imaging is corrected. Compared to the conventional elastic Gaussian beam migration for irregular surface, our method doesn't have the following modules: (1) elevation statics;(2) phase correction;(3) approximate substitution of speed and take-off angle between receivers and the beam centers. Our method is tested by using the unseparated multi-wave multicomponent data from a representative dual-complexity model and extract angle-domain common image gathers (ADCIGS). The result shows that compared with conventional method, our method can effectively eliminate the imaging energy error caused by the large distance between the beam center and detectors. Examples show the accuracy and efficiency of our method.

• 出版日期2015
• 单位中国石油大学（华东）