The link-up was for technical services and did not involve equity cooperation, China Petroleum & Chemical Corp, or Sinopec, said on its official microblog. It did not say how much money was involved.
Cooperation between Alibaba, a poster child for private enterprise in China, and one of the country's biggest state-owned companies dovetails with government policy.
Sinopec and other state behemoths have been under pressure to make better use of information technology and take advantage of cloud computing and big data to better track things like supply, demand and emissions.
Alibaba, whose US$25bil (RM90bil) initial public offering in New York in September was the biggest on record, has been leveraging its good standing with the government to forge cloud computing agreements with various government or state-run bodies.
"By helping Sinopec with digitisation and big data technologies, we hope we can play a part to help bring about greener solutions and new business opportunities," Allen Zhang, director at Alibaba's cloud computing business Aliyun, said in an e-mailed statement.
The cooperation between Aliyun and Sinopec would help upgrade some of the oil company's traditional petrochemical services, Sinopec said.
Aliyun is helping Sinopec build cloud-based business systems and perform data analytics covering the entire petrochemical production chain, Aliyun said.
The two companies were also exploring cooperation in areas including the so-called Internet of things, vehicle networking, finance and online payments, e-commerce and online-to-offline commerce.
Aliyun is China's biggest cloud services provider with about a 23% market share. — Reuters