天然气水合物的磁电阻率响应特征  

Magnetoelectric resistivity response characteristics for natural gas hydrate.

作　　者：翁爱华[1] 刘云鹤[2] 高丽娟[2] 高玲玲[2] 陈玉玲[2] 

机构地区：[1]吉林大学地探学院应用地球物理系,吉林省长春市西民主大街130026 [2]吉林大学应用地球物理系,吉林长春130026

出　　处：《石油地球物理勘探》2009年第A01期158-161,共4页Oil Geophysical Prospecting

基　　金：国家863高新技术研究发展计划项目(2006AA06Z109);国家自然科学基金项目(40874050)资助

摘　　要：文中将含天然气水合物的海底浅部层状沉积层的电性结构分为低阻海水、相对高阻的海洋沉积物、高阻天然气水合物和相对高阻的沉积物基底四层,借助点源直流磁电阻率计算公式,对海底天然气水合物沉积层模型进行了模拟。数值模拟结果表明:①天然气水合物沉积层可以引起较为明显的磁电阻率高阻异常;②天然气水合物沉积层的厚度、埋藏深度对磁电阻率异常观测结果影响不大;③装置相对海底高度的变化、装置间的相对位置变化对磁电阻率异常观测结果影响很大。因此利用磁电阻率法进行海底天然气勘探是可行的,并且近海底装置是最优的观测装置。In this paper the electrical structures for the layered seabed sediments which contain natural gas hydrate were divided to 4 categories, they are low resistance sea water, fairly high resistance marine sediment, high resistance natural gas hydrate and fairly high resistance substrate. By making use of Point source direct electric current magnetoelectric resistivity, the sediment model of the natural gas hydrate was simulated, the numerical simulation results show the following: (1) natural gas hydrate deposition can cause obvious high magnetoelectric resistivity anomaly. (2) the thickness and buried depth of the natural gas hydrate deposition do not greatly affect observation results for the high magnetoelectric resistivity anomaly. (3) device elevation change to the seabed and the location change of the devices have a great affect for the anomaly. As a result applying magnetoelectric resistivity method to conduct seabed natural gasexploration is feasible and the devices mounted close to the seabed are the best way to conduct the observation.

关 键 词：磁电阻率法 天然气水合物 响应特征 深度 厚度 装置配置 

分 类 号：P618.13[天文地球—矿床学] O484.43[天文地球—地质学]