In June of this year, the submarine electromagnetic collection station (OBEM) developed by Li Yuguo’s team successfully completed a 4000-meter seafloor magnetotelluric data acquisition test in southern China's waters. It is reported that if the technology is successfully applied to the field of offshore oil and gas exploration, the exploration efficiency will be doubled, and the exploration funds saved will be in the hundreds of millions.
Unwilling to monopolize independent research and development
Professor Li Yuguo is now deputy dean of the Ocean Earth Sciences College at Ocean University of China. During his PhD period, he studied abroad in Germany and the United States. He studied and studied abroad for 13 years. Until 2010, Li Yuguo returned home to concentrate on the research of electromagnetic detection technology.
Prof. Li Yuguo told the reporter that the marine electromagnetic method is one of the key technologies for the exploration of oil and gas resources on the seafloor. Since the 1980s, Western developed countries have begun to study. In recent years, marine electromagnetic technology has developed rapidly in the world and is already in the seabed oil and gas resources. The detection has achieved significant application results. “But at present, due to the secrecy and technological monopoly of marine electromagnetic technologies and related measured data by the international oil and gas industry, the core technologies of marine electromagnetic measurement equipment and acquisition are only controlled by the hands of a few geophysical exploration service companies. They do not sell instruments. Equipment and only technical services."
“The study of marine electromagnetic technology in China started relatively late. The research and development of this technology is quite lagging behind. There has been no instrumentation and technology for data processing and interpretation that can be used in deep sea oil and gas exploration. Therefore, we urgently need to accelerate the development of marine electromagnetic technology research and development. “The offshore oil and gas exploration technology with independent intellectual property rights.†Professor Li Yuguo introduced that in order to master the core technology of marine electromagnetics and develop independent property right measurement equipment, he returned to China and communicated with experts and scholars in school geology, information, and engineering fields. Submarine electromagnetic collection station R & D team. This work has received strong support from the Ministry of Science and Technology's 863 high-tech, the National Funds Fund and the China Geological Survey.
Three sea trials have been successful
According to reports, the submarine electromagnetic collection station consists of electromagnetic data recorders, electric field sensors, magnetic field sensors, beacons, releasers, azimuth and CTD recorders, floats, anchor lines, and frames, which can measure the three electric fields of the seafloor magnetotelluric field. Component and 2 magnetic field components.
"From the shape point of view, the submarine electromagnetic collection station is a square box, the following is cement anchoring, when the submarine by the cement anchored negative buoyancy subsidence, anchoring off after collection is completed, by the collector's own positive buoyancy float After surfaced, it finally passed its own GPS positioning. There are four tentacles on each side of the box to collect electromagnetic signals,†said Professor Li Yuguo.
It is reported that the seabed electromagnetic collection station has undergone three sea trials since its prototype was developed in May 2014. In May 2014, the prototype of the collection station developed for the first time was tested in two offshore shallow sea areas: Jiaozhou Bay and Shazikou. The first sea test was very successful. After the first sea trial, after improving the circuit equipment of the collection station, from December 2014 to January this year, the submarine electromagnetic collection station was equipped with Dongfanghong No. 2 of China Ocean University to conduct deep sea testing in the South China Sea and successfully completed 1,000 meters. Deep sea test.
In early June of this year, two submarine electromagnetic data acquisition stations equipped with a “sea large†ocean geological geophysical survey ship went to the South China Sea to conduct a deep sea trial. The team personnel placed two collection stations on the seabed with depths of 3682 meters, 3690 meters, 3711 meters, 3727 meters, and 4022 meters respectively, and the five tests were successfully recovered.
Save exploration costs by hundreds of millions
Professor Li Yuguo said that the submarine electromagnetic collection station can observe both the ocean electromagnetic field generated by natural field sources and the ocean electromagnetic field generated by artificial sources. This technology firstly plays a role in the field of offshore oil and gas resources and gas hydrate detection.
"Ocean oil and gas resources are increasingly important. Now, the investment for each offshore oil and gas drilling test is as low as 100 million yuan, and as much as billions. As for the technologies currently used in oil and gas exploration in China, the accuracy of exploration is limited, and the cost of wasteful exploration is lost. Huge.†Li Yuguo told reporters that after a complete understanding of the marine electromagnetic method, the exploration efficiency of marine oil and gas can be doubled. "For example, in the case of three boreholes in the seabed, there may be only one wellbore with oil and gas, and the other two are not. With this technology, it is possible to have two wells with three wellbores. This saves several Billion dollars."
Not only is it of great value for the exploration of marine oil and gas, but it is also of great significance for the study of the structure and dynamics of the earth's bottom. Li Yuguo stated that the submarine collection station can collect ocean electromagnetic fields and provide rich materials for human beings to know the ocean and discover the mysteries of the ocean.
“The research and development of the entire deepwater controlled source electromagnetic exploration system requires the development of underwater electromagnetic transmitters in addition to the submarine electromagnetic acquisition stations. The functional test of the transmitter is expected to be conducted in October this year. The entire detection system will be developed next year. All completed." Professor Li Yuguo introduction.
I have experienced large waves and spit out
Prof. Li Yuguo’s R&D team twice tested the deep sea in the South China Sea, each time at sea for about a month. Prof. Li Yuguo recalled that when he was conducting a sea trial at the end of last year, he happened to encounter several large surges in the South China Sea and the R&D team was almost completely surging.
Professor Li Yuguo said, but no matter how hard it is, when the sea test was successful, everyone felt that it was worth it. In particular, in June of this year, all successes of five deep-sea tests were internationally rare success rates (the average success rate of international sea trials was 50%), which validated the performance and function indicators of the submarine electromagnetic capture station in a deep-sea environment, allowing team personnel to Especially pleased. What makes Professor Li Yuguo proud is that the collector's electromagnetic data recorder, frame design, release mechanism, recycling beacon and electric field sensor all have independent intellectual property rights.
It is reported that the 4,000-m sea trial was successfully completed by the Offshore Electromagnetic Collecting Station (OBEM) developed by China Ocean University, marking a major breakthrough in the development of marine electromagnetic detection technology and equipment of the Ocean University of China, filling the gap in our country and making The development of marine electromagnetic equipment in China has reached the international advanced level, becoming the fourth country after the United States, Germany, and Japan capable of conducting ocean electromagnetic field measurement and research in the Shanghai region with a depth of more than 3,000 meters.
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