海洋空气枪点震源阵列优化组合设计与应用

应用气枪震源子波模拟软件,通过不同气枪阵列组合的震源子波模拟试算进行海上宽方位地震数据采集的点震源阵列设计。阐述了阵列组合对于点震源阵列优化设计的意义;分析了阵列间距和沉放深度对子波模拟结果的影响;针对渤海某工区海底复杂断裂带中、深层目的层成像问题,并结合BH518震源船的实际生产条件,设计了四子阵非对称分布点震源阵列并选出其最优阵列参数,使得其激发的远场子波在子波性能、频谱质量和能谱分布上达到各方面兼顾。将此点震源阵列应用于研究工区的地震采集试验,所获资料的最终成像效果得到显著改善,表明所设计的四子阵非对称分布点震源阵列是适用于实际宽方位地震资料采集作业的较优点震源阵列。

We apply air-gun source wavelet simulation software to test the point-source array design pressure signal of offshore wide-azimuth seismic data acquisition with different air-gun array combinations.The meaning of array combinations on the point-source array optimization design is characterized.Moreover,the impact of array spacing and array depth on wavelet simulation result is analyzed.Aiming at the target imaging problem of the middle-deep layers in ocean-bottom complex faulted zone at Bohai Area,combining with the actual operation conditions of BH518 geophysical vessel,four sub-arrays asymmetric distribution point-source array is proposed to adapt to offshore seismic exploration.The far-field wavelet stimulated by the point-source array meets the requirements in the wavelet performance,spectrum quality and spectral energy distribution.The results show that four sub-arrays asymmetric distribution point-source array is suitable for the offshore wide-azimuth seismic data acquisition.

国家重大科技专项项目“南海深水区油气勘探地球物理关键技术”(2011ZX05025-001)资助。