Research And Development Of Marine Controlled-Source Electromagnetic Data Processing Technology With Two Ships And Multiple Cables

Dual-vessel towed marine electromagnetic exploration technology is a new electromagnetic exploration technology used to detect oil and gas reservoirs.Compared with the traditional marine electromagnetic exploration technology,this technology works in a way that does not require a receiver to be placed on the seafloor in advance and is more flexible to use.Applying this technology for data acquisition,the signal has less attenuation and can collect geoelectric information from deep below the seafloor,and this technology is now widely used in gas hydrate exploration.With the development of marine controlled source electromagnetic technology,the related theoretical research tends to be mature and the equipment is gradually improved,but the processing technology of digital data is still lagging behind.There are many procedures for processing marine controlled source electromagnetic data,but there are few systematic data processing software,and the existing software has a single function,cumbersome operation steps,and poor user experience.Therefore,it is of great practical significance to develop a complete set of controlled source electromagnetic data processing software with two ships and multiple cables.This paper proposes a complete set of digital data processing method based on the project of "deep-sea dual-vessel towed marine electromagnetic exploration system development",combines digital processing technology with software development technology,and develops a dual-ship multi-chain cable controlled-source electromagnetic data visualization processing software.Compared with other traditional controlled-source electromagnetic data processing software,this software can meet the demand for processing controlled-source electromagnetic data of dual-ship multi-link cable with more complete functions and higher processing efficiency.The software is based on the windows platform,using a mixture of C++ and Matlab language programming,using Duilib interface rendering technology and multi-threaded development technology together with the development of the software.From the perspective of function,the software can be divided into three parts,one is the original signal display part,which includes the multi-link cable receiver data selection and loading module,transmit current signal display module,navigation data visualization module;the second is the data analysis part,which is mainly the current signal quality analysis module;the third part is the data processing part,which includes two parts: parameter setting and data analysis,of which Parameter setting mainly includes receiver parameter setting,transmitter parameter setting,navigation parameter setting and rotation parameter setting.The data analysis includes the generation of MVT/PVT curves and apparent resistivity calculation.Considering that Matlab has complete graphics processing functions and powerful drawing functions,the graphing of apparent resistivity is chosen to be done by Matlab.Finally,each function of the software was tested with real data,and the effectiveness of the software and the accuracy of the data processing results were verified by comparison.