深拖式等离子体震源基础研究

项目名称： 深拖式等离子体震源基础研究

项目编号： No.41476080

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 黄逸凡

作者单位： 浙江大学

项目金额： 84万元

中文摘要： 深拖式等离子体震源的研发有助于提高我国深海高分辨率地震勘探技术实力，形成拥有自主知识产权的特色深拖震源技术，大力推动海洋地球物理研究和海底资源的勘探开发。本项目针对深拖式等离子体震源的基础问题，即深水环境下高压脉冲放电的电-等离子体-声基础物化问题进行研究，采用模型仿真和电、光、声同步测试相结合的方法对高压脉冲放电的电负载特性、等离子体物化特性、气泡热力学和动力学过程、气泡间相互作用过程，以及子波能量和主频特性等参数进行仿真和测试，分析深水环境下电声能量转化过程中的各种损耗和子波能量效率，重点研究深水环境下高压脉冲放电负载阻抗的非线性过程、子波能量损失和主频变化等，解决超高水静压对水中高压脉冲放电的抑制或影响，以及满足深水高分辨率地震勘探所需子波能量和主频特性的电学设计原理等关键问题，为下一步深拖式等离子体震源技术开发奠定基础。

中文关键词： 等离子体震源；高分辨率；深海；地震勘探

英文摘要： The development of deep-towed plasma seismic source can improve the capability of deep sea high resolution seismic survey of our country. It will also become an characteristic deep-towed seismic source technology with own intelligent property, and promote the marine geophysical reseach and resource exploration in deep sea. This proposal aims at the basic problems of deep-towed plasma seismic source development, which refers to the physi-chemical problems of the electric-plasma-acoustic process induced by high voltage pulsed discharge in deep water. The computer simulation method and simultaneous detection of electrical signal, optical signal and acoustic signal method are used commonly to study the pulsed discharge load characteristic, plasma characteristic, bubble thermodynamics and dynamics, bubble interaction, and the energy and frequency properties of the wavelet. All kinds of energy losses and the total energy efficiency of electro-acoustic energy transition process will also be analyzed. The focuses will be the non-linear variation of pulsed discharge load impedance and the energy decreasing and spectrum changing of the wavelet induced by super high static pressure. Two main technical questions will be answered in this study: whether the pulsed discharge will be inhibited by the super high static pressure or what kind of influence will it has, and what will be the electric design principles generating wavelet with required energy and frequency characteristics in the field of deep sea high resolution seismic survey. Finally, this study will lay the foundation of the technical development of deep-towed plasma seismic source in the next step.

英文关键词： Plasma seismic source;High resolution;Deep ocean;Seismic survey