Below lists the country's oil and gas trunk lines, according to company websites and state media reports.

NATURAL GAS

PetroChina operated by the end of 2017 a total of 82,374 km(51,185 miles) of oil and gas pipelines, including 51,315 km of gas lines, 19,670 km of crude pipelines and 11,389 km of refined fuel pipelines.

Most of PetroChina's pipeline assets are under its unit PetroChina Pipeline Company, in which PetroChina owns about 72.3 percent and the rest is held by minority stakeholders. The pipeline company has total asset of 235.7 billion yuan ($35.25 billion).

Main units under the PetroChina Pipeline Co:

- PetroChina Northwest United Pipeline Co. It operates West-to-East No.3 project that starts at Khorgos in the Xinjiang region and ends in Fuzhou on the south coast, spanning 10 provinces. Total length 5,220 km, annual volume 20 billion cubic metres (bcm).

- PetroChina Pipeline United Co Ltd operates western portion of West-to-East No.2 project spanning Xinjiang region and Gansu province. Total length 2,434 km. The unit also operates western section of West-to-East No.1 project that runs through Xinjiang and Gansu. Total length 2,008 km. Annual volume 38 bcm in 2016.

- PetroChina East Pipeline Co: operator of eastern sections of West-to-East projects No.1 and No.2.

PetroChina Beijing Gas Pipeline:

It's unclear if the four trunk lines run by PetroChina Beijing Gas Pipeline Co, also known as the Shanjing project, that supplies gas from the Ordos basin to the Chinese capital will be incorporated into the new entity.

With total assets of 35.6 billion yuan by end of 2016, PetroChina's majority-controlled unit Kunlun Energy Co. Ltd owns 60 percent, while Beijing Enterprise Holdings owns the rest 40 percent. The Shanjing project pumped 40.2 bcm of gas in 2018, CNPC said.

Chuanyu Pipeline:

The country's most complete regional gas grid of about 42,000 km in the southwestern province of Sichuan and Chongqing municipality, with annual transport capacity of 30 bcm.

PetroChina Southwest Pipeline Co:

It runs the domestic portion of Myanmar-China gas pipeline, and regional trunk lines from Zhongwei to Guiyang and Guangzhou and Nanning.

Sinopec:

Flagship project Sichuan-Shanghai line in which the state oil major owns 50 percent equity. State-run insurer China Life owns 43.86 percent and the State Investment and Transport Co 6.14 percent.

The 2,270-km line connects Sichuan, Chongqing, Hubei, Jiangxi, Anhui, Jiangsu, Zhejiang and Shanghai, with designed annual transport capacity of 12 bcm.

CNOOC:

The company is the leader in developing liquefied natural gas terminals and has over the years focused on regional gas grids in the southern provinces of Hainan, Guangdong and Fujian and east China's Zhejiang province, operating and building a combined 5,000-km of pipelines.

CRUDE OIL

PetroChina:

Northeast line, 2,400-km long, connecting Daqing oilfield in Heilongjiang province and Jilin oilfield in Jilin province, with handling capacity of 40 million tonnes per year (tpy).

Northwest Shanshan-Lanzhou line, 1,562-km, connecting Shanshan in Xinjiang and Lanzhou of Gansu province, annual capacity 20 million tpy.

Changqing-Hohohot line, 563-km, capacity 5 million tpy.

Sinopec:

The 850-km Yonghuning crude line connecting top refineries in Ningbo, Shanghai and Nanjing. Capacity of 47 million tpy.

The 560-km Yizheng-Changling line I with capacity of 20 million tpy and a double line, 980-km long, with annual capacity of 27 million tonnes. Both lines connect Sinopec's refineries along the Yangtze river

REFINED FUEL

PetroChina:

The 1,250-km Lanzhou-Chengdu-Chongqing pipeline, including 5 million tpy Lanzhou-Chengdu portion and 2.5 million tpy Chengdu-Chongqing portion

The 1,858-km Urumqi-Lanzhou line, 10 million tpy

The 2,134-km Lanzhou-Zhengzhou-Changsha line, 15 million tpy

The 679-km Dagang-Jinan-Zaozhuang line, 3 million tpy

Sinopec:

South China grid, total length 6,036 km, spanning Guangdong, Guangxi and Hainan provinces; capacity 8.8 million tpy

($1 = 6.6858 Chinese yuan renminbi)

(Compiled by Chen Aizhu in SINGAPORE and Zhang Min in BEIJING; editing by Christian Schmollinger)