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...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.展开更多
Graphene sheets are extremely flexible, and thus small forces, such as van der Waals interaction, can induce significant out-of-plane deformation, such as folding. Folded graphene sheets show racket shaped edges, whic...Graphene sheets are extremely flexible, and thus small forces, such as van der Waals interaction, can induce significant out-of-plane deformation, such as folding. Folded graphene sheets show racket shaped edges, which can significantly affect the electrical properties of graphene. In this paper, we present combined theoretical and computational studies to reveal the folding behavior of multi-layer graphene sheets. A nonlinear theoretical model is established to determine the critical length of multilayer graphene sheets for metastable and stable folding, and to accurately predict the shapes of folded edges. These results all show good agree- ment with those obtained by molecular dynamics simulations.展开更多
文摘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.
基金supported by the National Natural Science Foundation of China(11172022 and 11302039)the Major Project of Chinese National Programs for Fundamental Research and Development(2010CB832703)
文摘Graphene sheets are extremely flexible, and thus small forces, such as van der Waals interaction, can induce significant out-of-plane deformation, such as folding. Folded graphene sheets show racket shaped edges, which can significantly affect the electrical properties of graphene. In this paper, we present combined theoretical and computational studies to reveal the folding behavior of multi-layer graphene sheets. A nonlinear theoretical model is established to determine the critical length of multilayer graphene sheets for metastable and stable folding, and to accurately predict the shapes of folded edges. These results all show good agree- ment with those obtained by molecular dynamics simulations.
