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中国晚古生代煤系气源岩为下石炭统滴水泉组、上石炭统巴塔玛依内山组、本溪组、下二叠统太原组和山西组以及上二叠统龙潭组,形成煤成气在奥陶系、石炭系、二叠系和古新系成藏,并分布在鄂尔多斯盆地、渤海湾盆地、准噶尔盆地和四川盆地,共发现16个气田,其中12个为大气田,如中国储量最大、年产量最高的苏里格大气田。根据99个气样的组分和烷烃气碳同位素资料,以δ~(13)C_2值>-28.5‰为煤成气以及应用δ~(13)C_1—δ~(13)C_2—δ~(13)C_3鉴别图判别了上述气田均为煤成气。晚古生代煤系形成相关气田对中国天然气工业有重要意义:一是中国探明天然气总地质储量和年产量,其占1/3;二是支持中国成为产气大国5个关键大气田中3个(苏里格、靖边和大牛地)气源为该类气;三是晚古生代煤系形成各气田和各大气田平均储量分别是全国各气田和各大气田的5.3倍和1.7倍。
The Late Paleozoic coal measures in China are derived from the Lower Shuiquanquan Formation, the Upper Carboniferous Batamayi Neishan Formation, the Benxi Formation, the Lower Permian Taiyuan Formation and the Shanxi Formation and the Upper Permian Longtan Formation to form coal-derived gas In the Ordovician, Carboniferous, Permian and Paleocene reservoirs, and distributed in the Ordos Basin, Bohai Bay Basin, Junggar Basin and Sichuan Basin, a total of 16 gas fields were discovered, of which 12 are large gas fields, such as China reserves Largest and highest annual output of Sulige gas field. According to the composition of 99 gas samples and the carbon isotope data of alkanes, δ ~ (13) C_2> -28.5 ‰ was used as the coal-formed gas and δ ~ (13) C_1-δ ~ (13) C_2-δ ~ 13) C_3 discrimination map to determine the gas field are coal into gas. The formation of relevant gas fields in the Late Paleozoic coal measures is of great significance to the natural gas industry in China. The first is the total geological reserves and annual production of proven natural gas in China, accounting for one third of the total. The second is to support 3 of China’s 5 major gas fields, Sulige, Jingbian and Daniuodi). Thirdly, the average reserves of gas fields and major gas fields in the Late Paleozoic coal measures are 5.3 times and 1.7 times that of the gas fields in China and the major gas fields respectively.