A worker checks facilities at the Fuling shale gas field in Chongqing, Southwest China. [Photo/Xinhua]

China is likely to build two shale gas facilities in the central and southern parts of the country and issue more tenders for oil and gas exploration, the Ministry of Land Resources said on Tuesday.

The ministry said at a news conference in Beijing that following an investigation, China is also likely to conduct commercial production of shale gas in the southern city of Zunyi in Guizhou province and in Yichang in Hubei province.

The ministry did not give a timetable for the start date at the news conference.

Natural gas is set to play an increasingly important role in the country's energy mix, with the nation pushing to wean itself off coal－betting big on a shale gas boom to rid itself of its dependency on the more polluting energy source and on foreign gas imports for better energy security.

As part of the Chinese government's 13th Five-Year Plan (2016-20) for natural gas, the proportion of natural gas in the energy consumption mix will rise to about 10 percent by 2020, from about 5.9 percent in 2015.

According to the ministry, oil and gas exploration efforts cover a vast 500,000 square kilometers area in the north of the country alone and China has also discovered new natural gas and light crude reserves there.

The ministry said on Tuesday that the authorities are encouraging private firms to participate in a tender for shale gas exploration rights in Guizhou on Aug 18. The ministry said it would also consider more auctions of shale gas exploration blocks outside Guizhou.

China has vowed to further strengthen its oil and gas pipeline network during the next decade. That's in order to further boost the share of gas, a cleaner fuel, in the country's energy mix.

According to the National Development and Reform Commission, the oil and gas pipeline network is expected to reach 240,000 kilometers by 2025, with natural gas pipelines reaching 123,000 kilometers.

With 112,000 kilometers of oil and gas pipelines in the country so far, China will need to build another 128,000 kilometers of pipeline in the next few years, the nation's top economic regulator said last month.

Zheng Jian, deputy head of the commission's basic industries section, said the expansion is to meet China's rapid energy demand and energy diversification needs.

Energy companies are eyeing a bigger slice of the booming sector, with China Petroleum and Chemical Corp, the world's biggest refiner, saying it will double its annual natural gas output by 2020 to 40 billion cubic meters.

Sinopec's Fuling shale gas field, China's first commercial shale gas production program, was launched in 2014. It will reach an annual output of up to 10 billion cu m by the end of this year, Sinopec said.

Proven shale gas reserves of the field, located in Chongqing, now exceed 600 billion cu m, following the discovery of more than 220 billion cu m of additional deposits earlier this month.

Wang Lu, an Asia-Pacific oil and gas analyst at Bloomberg Intelligence, said Sinopec's Fuling project would play a leading role in China achieving its goal of producing 80 to 100 billion cu m in 2030, and its shale gas production may contribute about 4 to 5 percent of China's total gas consumption by 2020.