4.6 Article

Sichuan super gas basin in southwest China

期刊

PETROLEUM EXPLORATION AND DEVELOPMENT
卷 48, 期 6, 页码 1251-1259

出版社

KEAI PUBLISHING LTD
DOI: 10.1016/S1876-3804(21)60284-7

关键词

Sichuan Basin; super basin; oil and gas production; resource; source rocks; large gas fields; shale gas; tight sand-stone gas; ultra-deep gas reservoir

资金

  1. Consultation and Evaluation Project of Department of Geosciences, Chinese Academy of Sciences [2018-G01-B-005]
  2. State key R D Project [2019YFC1805505]
  3. National Natural Science Foundation of China [41872122]
  4. Outstanding Youth Program of National Natural Science Foundation of China [41625009]

向作者/读者索取更多资源

The Sichuan Basin is classified as a super gas basin due to its abundant gas source rocks, large remaining recoverable resources, numerous large gas fields, and high total gas production.
A sedimentary basin is classified as a super basin when its cumulative production exceeds 5 billion barrels of oil equivalent (6.82x10(8) t of oil or 7931.66x10(8) m(3) of gas) and its remaining recoverable resources are at least 5 billion barrels of oil equivalent. By the end of 2019, the total output of oil and gas in Sichuan Basin had been 6569x10(8) m(3) with the gas-oil ratio of 80:1, and the total remaining recoverable resources reached 136 404x10(8) m(3), which makes it as a second-tier super basin. Because the output is mainly gas, it is a super gas basin. The reason why the Sichuan Basin is a super gas basin is that it has four advantages: (1) The advantage of gas source rocks: it has the most gas source rocks (9 sets) among all the basins in China. (2) The advantage of resource quantity: it has the most total remaining recoverable resources among all the basins in China (136 404x10(8) m(3)). (3) The advantage of large gas fields: it has the most large gas fields (27) among all the basins in China. (4) The advantage of total production: by the end of 2019, the total gas production had been 6 487.8x10(8) m(3), which ranked the first among all the basins in China. There are four major breakthroughs in natural gas exploration in Sichuan Basin: (1) A breakthrough in shale gas: shale gas was firstly found in the Ordovician Wufeng-Silurian Longmaxi formations in China. (2) A breakthrough in tight sandstone gas: the Triassic Xu2 Member gas reservoir in Zhongba gas field is the first high recovery tight sandstone gas reservoir in China. (3) A breakthrough in giant carbonate gas fields. (4) A breakthrough in ultra-deep gas reservoir. These breakthroughs have led to important progress in different basins across the country. Super basins are classified according to three criteria: cumulative production and remaining recoverable resources of oil and gas, tectonic attributes of the basin, and the proportions of oil and gas in cumulative oil and gas production.

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