A seafloor electromagnetic receiver for marine magnetotellurics and marine controlled-source electromagnetic sounding

被引：15

作者：

Chen Kai ^{[1
]}

Wei Wen-Bo ^{[1
]}

Deng Ming ^{[1
]}

Wu Zhong-Liang ^{[2
]}

Yu Gang ^{[3
]}

机构：

[1] China Univ Geosci, Key Lab Geodetect, Minist Educ, Beijing 100083, Peoples R China

[2] China Geol Survey, Guangzhou Marine Geol Survey, Guangzhou 510760, Guangdong, Peoples R China

[3] CNPC, Nonseism Survey, BGP, Zhuozhou 072751, Hebei, Peoples R China

来源：

APPLIED GEOPHYSICS | 2015年 / 12卷 / 03期

关键词：

MCSEM; seafloor EM receiver; seafloor electric field sensor; chopper amplifier; acoustic telemetry modem; HYDROCARBON EXPLORATION; HYDRATE; CSEM;

D O I：

10.1007/s11770-015-0494-0

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

In planning and executing marine controlled-source electromagnetic methods, seafloor electromagnetic receivers must overcome the problems of noise, clock drift, and power consumption. To design a receiver that performs well and overcomes the abovementioned problems, we performed forward modeling of the E-field abnormal response and established the receiver's characteristics. We describe the design optimization and the I; properties of each component, that is, low-noise induction coil sensor, low-noise Ag/AgCl electrode, low-noise chopper amplifier, digital temperature-compensated crystal oscillator module, acoustic telemetry modem, and burn wire system. Finally, we discuss the results I of onshore and offshore field tests to show the effectiveness of the developed seafloor, electromagnetic receiver and its performance: typical E-field noise of 0.12 nV/m/rt(Hz) at 0.5 Hz, dynamic range higher than 120 dB, clock drift lower than 1 ms/day, and continuous; operation of at least 21 days.

引用

页码：317 / 326

页数：10

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