南黄海海底大地电磁测深试验研究  

Experimental study of marine magnetotellurics in southern Huanghai

作　　者：魏文博[1,2] 邓明[1,2] 温珍河[3] 张自力[4] 叶高峰[1,2] 金胜[1,2] 张启升[1,2] 景建恩[1,2] 王猛[1,2] 陈凯[1,2] 

机构地区：[1]地下信息探测技术与仪器教育部重点实验室,地质过程与矿产资源国家重点实验室,北京100083 [2]中国地质大学(北京)地球物理与信息技术学院,北京100083 [3]中国地质调查局青岛海洋地质研究所,青岛266071 [4]中国地质大学(北京)材料科学与工程学院,北京100083

出　　处：《地球物理学报》2009年第3期740-749,共10页Chinese Journal of Geophysics

基　　金：国家863课题(2006AA09A201,2002AA615020,820-03-04);国家十五油气选区专项研究课题(XQ-2005-01-02-02)资助

摘　　要：针对南黄海盆地深层地震地质条件差,地震波受屏蔽.能量严重哀减,在海洋反射地震资料中很难识别反映中-古生界的反射地震波组,不能满足南黄海盆地前第三系油气资源前景评价的需要等问题,于2006年5月.开展了南黄海海域海底大地电磁测深试验,在盆地内五莲斜坡和胶州凹陷区布设了3个海底大地电磁测深点,取得了可靠的海底观测数据.本文详细阐述了海底大地电磁测深与常规大地电磁测深在数据处理方法上的差别,论述了海洋电磁噪声对海底大地电磁场观测的影响,提出了海底大地电磁场实测资料"水平姿态"校正、"方位"校正和"海洋电磁噪声"校正的方法.通过对试验观测资料的处理和反演,并结合地质、物性资料进行综合分析,结果表明在南黄海盆地海底以下深部还存留有古生代地层,这对于南黄海前第三系含油气前景的评价具有重要意义.试验结果也证明了海底大地电磁测深技术在研究古生代残留盆地方面的问题可以发挥相当好的作用.Seismic energy is disturbed and attenuated seriously under the bad geological conditions for seismic exploration in southern Huanghai （Yellow Sea） basin, and therefore the Meso- Paleozoic wave group of marine reflection seismic cannot be recognized and the seismogram does not meet the requirement for evaluation of pre Tertiary oil/gas resources in southern Huanghai basin. In May 2006, marine magnetotelluric （MT） sounding experiment was carried out and reliable data were acquired. In the experiment, 3 MT stations were deployed in regions of Wulian slope and Jiaozhou depression. On the basis of analysis on discrimination between marine and land MT data processing and discussion of marine electromagnetic noises, the correct methods of marine MT data about instrument obliquity and orientation and marine noise are presented. The result of MT data processing and inversion integrating geological and petrophysical data shows the existence of Paleozoic formations and is significant for the evaluation of pre-Tertiary oil/gas resources in the southern Huanghai basin. The experiment provides the evidence that marine MT technique can play an important role in the investigation of Paleozoic sediment basins.

关 键 词：南黄海 海底大地电磁测深 油气资源 中-古生界 海洋电磁噪声校正 

分 类 号：P631[天文地球—地质矿产勘探]