China needs to have a robust oil exploration industry. The US often uses its advantage in oil & gas drilling technology to sanction other countries. For example they did this in the Yamal LNG project where they sanctioned the Russians from using US drilling technology. The Russians had to develop their own gas pumping turbines and gas drilling tech. Even if it is not for their own use China needs this in order to sell it to countries like Iran or Venezuela which can then export their oil to China.
China has had a massive migration of people from rural areas into cities and is building lots and lots of secondary cities to both take the pressure off major cities and take people away from rural areas where services are a lot worse. I think the reorganization of agriculture is a matter of time. Just look at how Russia did it after the Ukrainian sanctions. They quickly built up their agribusiness sector by both funding their tractor and fertilizer industries, enacting quotas or barrier on foreign food products, and giving low interest rate loans to farmers and the food processing industry to improve their production. It took them less than a decade to go from a grain importer to a grain exporter.
		
		
	 
China was late in offshore prospecting compare to the west but they make more than make up in recent year. I did agree China actually does not lack oil reserve but the problem most of them are located in remote Tarim basin in Xinjiang. The oil field in the eastern seacoast like Daging and Shengli are getting old but remarkably still able to pump oil with enhanced recovery.
If you look historically it is remarkable what China did prior to WW II China must import all of her oil need and western expert said there is no oil bearing in China. But Chinese expert buck that assertion and found a new oil prospecting theory and they did find oil in Gansu province. Now it is harder and harder finding oil onshore and when they found it is sofar from the market and with attending high cost of transporting and building the infrastructure to bring it to market.
So offshore exploring is a must But it require high technology and only recently China master this technology. Offshore drilling is high tech imagine you drill 5 km deep and only allow 3 or 4 inch deviation meaning you have to maintain fix position with little tolerance, It is remarkable Journey from no oil pre WWII and now venturing into high tech offshore prospecting. Here is the historic oil find in Yumen oil field. It was critical back then as Japan blocked access to oil and oil is needed to run war effort. They did prevail build the refinery in a year or two. So looking back it is not first time china face do or die moment similar to semi embargo now 
Geologist Sun Jianchu Thrice Investigates Yumen In  the  1930s,  a  geologist  from  the  Central  Geological  Survey,  Sun  Jianchu  孙健初  and  his  group  went  to  Yumen  three  times  to  investigate  oil,  the  first  time in 1934 and 1935. He and Zhou Zongjun and others traveled to the moun-tainous  region  in  the  western  part  of  Gansu  and  the  northeastern  part  of  Qinghai,  but  due  to  unrest,  they  could  not  penetrate  it  deeply.
The  second  time  was  in  June  1937,  when  the  preparatory  office  of  the  China  Kerosene  Exploration Company organized an expedition to the northwest that was led by Shi Youming 史悠明 and geologist Sun Jianchu; they were accompanied by two Americans, the noted geologist Dr. James Marvin Weller and the engineer Dr. Frederic A. Sutton. In October 1937, while traveling westward from Jiuquan, they  found  oil  in  Baiyang  River  白杨河  in  Yumen  County  and  Shiyou  River  石油河  in  Laojunmiao  老君庙.  During  their  voyage  they  saw  three  peasants  skimming  oil  off  the  Shiyou  River  by  the  old  temple  to  Taishang  Laojun  (the  deified Laozi) south of Yumen (from which the name of the place, Laojunmiao, derives). After a detailed investigation, Weller and his team wrote, in their exploration report. In  this  district  ...  development  costs  will  be  very  high,  and  if  oil  prospecting here is to be considered as strictly a business proposition, most careful consideration must be given to all of the factors involved in development,  production,  refining,  and  marketing  aspects  before  a  decision  is made to proceed further.
If, on the other hand, the development of an oilfield  in  the  northwest  part  of  China  is  required  for  national  defense,  to be accomplished at any cost, the Shih Yu Ho [Shiyou River] anticline should  certainly  be  drilled....  [E]ven  with  the  utmost  dispatch  and  the  best of luck, it is likely that at least two years would be required to drill the first wells and install a small refinery.1On April  18  and  19,  1938,  Weller  and  Sun  Jianchu  reported  twice  in  Hankou  to  Weng  Wenhao,  who  was  then  the  Minister  of  Economic  Affairs  and  the  director of Central Geological Survey. Weller’s geological writings fully reflect the scientific spirit of a geologist seeking truth from facts, and he was generous in recognizing the contributions of Chinese geologists, like Sun Jianchu, who had done exploratory work before him.1   J.  Marvin  Weller, Caravan Across China: An American Geologist Explores the Northwest, 1937–1938, edited by Harriet Weller (San Francisco: March Hare Publishing, 1984), 235–36.
Overview on Deep Water Drilling
World Advanced Offshore Platform Sets out to Sea from China's Jiangsu
The world's most advanced semi-submersible heavy-lifting offshore platform left its berth in Nantong City, east China's Jiangsu Province, on Saturday afternoon, setting out to sea under the escort of eight maritime patrol boats.
China built her first offshore drilling platform 2 years ago and now in operation in LIngshui field off Haina
Live: World's largest semi-submersible oil and gas production platform sets off for South China Sea
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•Streamed live on Jan 16, 2021
Yumen Oil Province
Yumen Oil Province, known as the cradle of China's petroleum industry, is the first petroleum base in China and was put into operation as early as 1939.
	
	
	
		
		
		
			
		
		
	
	
In order to increase the ultimate oil recovery, through fine reservoir description and better understanding of residual oil distribution, CNPC puts this mature oilfield into redevelopment. Well patterns were rearranged in blocks including Laojunmian, Yaerxia and Baiyanghe to build new development patterns with vertical injectors and horizontal producers. Meanwhile, horizontal, directional, cluster and underbalanced wells were drilled to achieve maximum output and recovery.
Laojunmiao Oilfield
Laojunmiao Oilfield, the earliest oilfield discovered in China, lies in Jiuquan Basin in Gansu Province. In 1954, pilot waterflood was conducted in Laojunmiao Oilfield in Yumen. This is an important milestone in China's oilfield development history, and provides valuable experience for the long-term high and stable production of giant oilfields discovered subsequently, such as Daqing.
Laojunmiao Oilfield has been developed for nearly 70 years, with low output at many of its oil wells. Complex underground water/oil dynamics and faulty well patterns made the reserves difficult to tap. In 2008, CNPC launched a pilot redevelopment test at the M Block to rearrange the well patterns based on dynamic analysis. In addition, monitoring of the distribution law of residual oil, horizontal drilling, directional drilling, and underbalanced drilling were employed. The rate of production decline at the block was brought under control and the daily oil output increased from 105 metric tons to 136 metric tons.