【摘要】 塔里木盆地巴楚隆起勘探程度较低,是开展油气勘探的主要潜力区之一。受近地表激发条件差、低降速带结构变化大、目的层埋藏较深等地表和深层地质条件的影响,研究区地震资料信噪比低、品质较差,严重地制约了地震资料解决地质问题的能力。本文在分析研究区新采集的原始地震资料基础上,建立了精确的近地表模型,采用层析静校正、交互迭代静校正方法求准静校正量;利用多域多阶段联合去除噪声,采取近道内切除等多种方法串联综合应用消除多次波干扰;采用全面统计、逐点处理的地表一致性处理技术进行振幅能量补偿;精细速度分析,优选提高深层弱信号成像质量的偏移方法等一系列的关键技术,使本区低信噪比资料的信噪比、同相轴连续性和构造成像质量得到了较大的改善和提高,取得了较好的应用效果。更多还原

【Abstract】 The prospecting extent in the whole Bachu uplift of Tarim Basin is relatively low,which however is a potential area for oil and gas exploration.The poor near-surface shooting conditions,deeply buried target areas and deep geological conditions result in the serious seismic data static correction problem,highly-developed interference wave,difficulties in correct recognition of multiple wave,improvement of the energy of deep reflection wave and accurate obtaining of the velocity and migration imaging.Low S/N ratio data and poor quality have greatly restricted the capability of solving the geological problem by using seismic data.Through an analysis of newly acquired seismic data,the authors accurately built a near-surface model for calculating accurate static values and enhancing pre-stack attenuation.Various amplitude energy compensation methods were used for accurate velocity analysis to improve the precision of the velocity field,and inner mute was adopted in near traces.Integrated application of cascade methods was adopted to eliminate multiple interference,migration method was chosen for improving the imaging quality of deep weak signal and S/N ratio in this low S/N ratio area and,as a result,event continuity and structure imaging quality were greatly enhanced and improved,thus attaining superior applying results.更多还原