【摘要】 南黄海盆地中部隆起区前第三系油气储层主要为中古生代海相碳酸盐岩地层,厚度大、分布广,具有良好的油气前景.由于厚度小于1000 m的新近系低速地层直接覆盖在高速碳酸盐岩地层之上,对地震波的向下传播起到了强烈的屏蔽作用,使之深部目的层地震资料品质差,影响了油气勘探的进程.根据区域地质、地球物理特征,进行了基于AVO(Amplitude Versus Offset,振幅随偏移距变化)与地震波吸收衰减的地震反射振幅理论模拟分析,获得了主要反射界面的地震反射振幅与偏移距关系.在对不同气枪、电缆沉放组合的震源子波特征模拟分析的基础上,重点选取波形好、穿透能力强的气枪、电缆沉放组合系列,通过试验选择了适宜的采集参数进行地震资料采集,获得了有效深部弱反射地震信号.更多还原

【Abstract】 Pre-Tertiary reservoir in the central rise of the Southern Yellow Sea Basin(SYSB) consists of mainly Paleozoic and Mesozoic marine carbonates.It is of huge thickness,wide distribution and good hydrocarbon potential.Neogene low velocity strata with thickness less than 1000 m cover on the high velocity Pre-Tertiary carbonate and induce strong shielding effects on seismic wave propagation,and produce poor quality of seismic data.Therefore,this hampers the progress of hydrocarbon exploration.Based on regional geology and geophysical field in the southern Yellow Sea,theoretical modeling of seismic reflection amplitude with AVO and absorption attenuation was conducted,and the relationship of seismic amplitude and migration distance was gained.On the analysis of wavelet modeling for different airgun and cable sink depth,we chose the gun and stream array with fined waveform and strong penetration.A series of seismic acquisition parameters in the seismic experiment have been gained in order to get the signature of deep reflection.更多还原