南海北部中生界地震资料整体品质较差,制约了本地区中生界目标的勘探进程.本文以南海北部珠江口盆地A区块为研究对象,详细分析本地区地质条件与三维地震资料特征,总结出影响南海北部中生界地震成像关键因素为中生界地层反射能量弱、复杂多次波发育、速度分析不准.针对这些问题,在常规资料处理流程中加入τ-p域缆鬼波压制技术、3DSRME(3D Surface Related Multiple Attenuation)+高精度拉东变换+DIMAT(Diffraction Multiple Attenuation)组合去多次波、高精度速度建模技术后,A区块中生界地震资料品质得到显著改善,地层产状及接触关系清晰,波组特征层次感强,同相轴连续性好,断裂成像清楚,为本地区中生界油气勘探潜力评价工作提供了可靠的保障.
Analysis and Response of Key Factors in Mesozoic Seismic Imaging in the Northern South China Sea
The overall quality of Mesozoic seismic data in the northern South China Sea is poor,which restricts the exploration process of Mesozoic targets in this area.Taking block A in the Pearl River Mouth Basin of the northern South China Sea as a research object,this paper analyzes the geological conditions and 3D seismic data characteristics of this area in de-tail,and summarises the main factors affecting the seismic imaging of the Mesozoic strata in the northern South China Sea as weak reflection energy,complex multiple development and inaccurate velocity analysis.After the application of r-p domain cable ghost wave suppres-sion technology,3DSRME+high-precision Radon transform+DIMAT combination multiple wave suppression technology and high-precision velocity modelling technology,the quality of Mesozoic seismic data in block A has been significantly improved.The formation attitude and contact relationship are clear,the wave group characteristics have a strong sense of hierar-chy,the continuity of the same phase axis is good and the fault imaging is clear.This work provides a reliable guarantee for the Mesozoic exploration in the area.
万方数据
维普
