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Evaluation method for marine controllable source electromagnetic exploration noise reduction effects

An ocean and noise technology, applied in the field of ocean controllable source electromagnetic exploration and noise reduction, can solve the problems of lack of quantitative evaluation of noise reduction effect

Active Publication Date: 2018-10-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0007] In view of the lack of quantitative evaluation of the noise reduction effect of existing natural electromagnetic signal noise reduction methods, the present invention combines one-dimensional forward modeling of MCSEM signals, one-dimensional forward modeling of MT noise, noise reduction processing, and one-dimensional OCCAM inversion , proposed a method for evaluating the noise reduction effect of natural electromagnetic signal noise in marine controlled source electromagnetic exploration

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  • Evaluation method for marine controllable source electromagnetic exploration noise reduction effects
  • Evaluation method for marine controllable source electromagnetic exploration noise reduction effects
  • Evaluation method for marine controllable source electromagnetic exploration noise reduction effects

Examples

Experimental program
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Effect test

Embodiment 1

[0219] Set the resistivity and depth of the air layer, seawater layer and seabed stratum as Figure 7 shown. Set the transmit signal waveform as a square wave with a period of 10s, the length of the galvanic source is 250m, the transmitter is located 40m above the seabed, the platform sailing speed is 1m / s, the initial coordinates of the transmitter (0m, 0m, 960m), the number of receivers 1, the location is on the seabed, and the location coordinates are (0m, 0m, 1000m).

[0220] Bring the above parameters into the steps of the evaluation method of the present invention to obtain MT noise data files and MCSEM data files respectively, and obtain noisy MCSEM data after being added. Figure 8 It is the MVO curve diagram of the noise-free MCSEM signal electrical channel, Figure 9 is the MVO curve of the noise-free MCSEM signal magnetic channel, Figure 10 is the MVO curve diagram of the noisy MCSEM signal electrical channel, Figure 11 It is the MVO curve of the noisy MCSEM s...

Embodiment 2

[0224] In order to improve the fidelity of MT noise, the measured data during the period when the transmitter is not powered on is directly input as MT noise. An experiment in a sea area of ​​Equatorial Guinea in December 2009 was selected, and one-dimensional OCCAM inversion was carried out using the measured data during the start-up period of the MCSEM transmitter. The information obtained from the inversion is as follows: Figure 16 shown. According to the parameters in the relevant configuration file of this experiment, set the transmission signal waveform as a square wave with a period of 10s, the length of the galvanic source is 300m, the transmitter is located 50m above the seabed, the platform sailing speed is 1m / s, and the initial coordinates of the transmitter (0m, 0m, 850m), select one of the receiving sites whose location coordinates are (0m, 0m, 900m), and use part of the measured data during the period when the MCSEM transmitter is not powered on as MT noise.

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Abstract

The invention provides an evaluation method for marine controllable source electromagnetic exploration noise reduction effects, and concretely relates to an evaluation method for noise reduction effects of earth natural electromagnetic signal noise in marine controllable source electromagnetic exploration. A mean square relative error of a resistivity inversion result and a resistivity input valueare used as quantitative evaluation indexes of the noise reduction effects by combining MCSEM signal one-dimensional forward modeling, MT noise one-dimensional forward modeling, noise reduction processing and one-dimensional OCCAM inversion. MT noise can be generated by using a forward modeling means, and actual measured data of an MCSEM transmitter in a power-off time segment can be directly input to be the MT noise, and so the evaluation method can be ensured to have strong flexibility. Quantitative evaluation is carried out on the noise reduction effects of a method combining a short timewindow and pre-whitening filtering and the validity of the noise reduction effects is verified by using the evaluation method of the MT noise reduction effects provided by the invention. The noise reduction effect evaluation method provided by the invention has a wide application range, and fills the blank in the field of quantitative evaluation of noise reduction effects.

Description

technical field [0001] The invention relates to the field of noise reduction in marine controllable source electromagnetic exploration, in particular to a method for evaluating the noise reduction effect of earth's natural electromagnetic signal noise in marine controllable source electromagnetic exploration. Background technique [0002] With the continuous development of the global economy, human demand for natural resources continues to increase. The vast ocean contains rich resources and has great potential for development, so many oil companies have turned their attention to the ocean. Marine Controlled-Source Electromagnetic (MCSEM), as a new technology for marine oil and gas detection, can effectively identify high-resistivity oil and gas reservoirs on the seabed and significantly improve the success rate of drilling. Therefore, it has gained international attention in recent years. highly anticipated. [0003] Signal denoising is an important link in the data proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V13/00
CPCG01V13/00
Inventor 周鹏周文强吕伟强戴永寿孙伟峰万勇李立刚曲晓俊
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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