摘要
在采用瞬变电偶极—偶极装置(ERER)装置的海洋瞬变电磁法对天然气水合物进行正演模拟计算中,采用了先汉克尔变换(Hankel)后逆拉普拉斯变换法(G-S)的计算方法.由阿尔奇公式计算出水合物层按正弦规律变化的典型海洋地电模型.根据已知的地电模型计算天然气水合物的瞬变阶跃响应的一阶导数.从结果来看,水合物瞬变响应梯度的最小值最能反映出与水合物含量的关系,从中找出对天然气水合物做出了综合的资源评价及解释工作的有用信息.
Marine transient EM field in time field is calculated in the marine gas layer model of ERER system, It is the first hankel integration then Gaver Stehfest transformation method. The hydrate content gradually increases according to a sine law from zero upper boundary to the BSR boundary. The typical hydrate models are designed and calculated in Archie＇s law. The differential result of their transient step response to the time that can reflect the difference between hydrate models and their transient step response. The parameter is selected which is the most sensitive to analyze the relationship between hydrate content and transient step response. Finally resource evaluation for gas hydrate is made.
出处
《地球物理学进展》
CSCD
北大核心
2008年第5期1568-1574,共7页
Progress in Geophysics
关键词
天然气水合物
海洋瞬变电磁法
资源评价
Gas hydrate, transient electromagnetic method, resources evaluation
