中文摘要：

在浅海水声定位系统中,针对传统声呐信号持续时间长、效率低、正交性差的问题,提出了一种抗噪声、快速、窄带的水声混沌信号。通过推导Logistic混沌序列的混沌性和相关特性;并据此将具有混沌特性的相位信息对混沌序列进行调制。理论表明调制后的水声混沌信号具有正的Lyapunov指数、理想的相关性和窄带性。水域数据分析显示,水声混沌信号依旧表现出混沌性和窄带性;并且与同水域实验的m序列相比,定位精度提高了5 cm左右,信号时长缩短了73 ms,为海洋中动态目标的快速定位提供了参考。

英文摘要：

In recent years, there are more and more multi-stage fractured horizontal well being applied in ultra-low permeability reservoirs, but not all reservoirs are suitable for this technology. So the establishment of limits of rational policy is particularly important. On the one hand, from the aspect of economic, based on the principle of input-output balance, the economic limits of single well cumulative oil production and initial production capacity were calculated; On the other hand, from the aspect of technology, the single well actual productivity was also cal-culated, using potential theory and principle of pressure drop superposition. The actual initial capacity is required greater than or equal to the economic limit of initial capacity. A series of policy limits were set, which based on dif-ferent characterization indicators. Take Yan 227 ultra-low permeability reservoir as an example, a series of econom-ic and technological line chart were built, which can provide guidance for actual production.