SHALE GAS IN CHINA : NEW IMPORTANT ROLE OF ENERGY IN 21^ CENTURY

摘要

In terms of the shale gas occurring characteristic in china basin, four big provinces could be divided, including SouthChina, NorthChina, Northeastern China, and Northwestern China. It was estimated that the total shale gas resource ranged from 21.5 to 45 trillion m3, the average value is 30.7 trillion m3 .In SouthChina province, black shale occurred in upper simian, lower Cambrian, upper Ordovician-lower Silurian, middle Devonian, lower carboniferous, lower Permian, upper Permian, lower Triassic etc. 8 set of formations. Study on TOC, maturity of source rocks proved that that black shale had huge potential in shale gas. In weiyuan anticline of Sichuan Basin, Wei-5 well finished in 1966 had found gas influx and blowout, and acquired 24.6 thousand cubic meter production rate. In Northchina province, upper Paleozoic formation has widely occurred marine-terrigenous facies coal and dark shale layers. Organic matter in dark mudstone ranged from 2 to 5 percent. Thickness ranged from 70 to 200 meter. This is primary condition for shale gas. In western of Ordos basin, many area with high mature coal and mudstone, high hydrocarbon generation rate and developed fractures were favorable places for shale gas exploring. In Songliao basin in Northeastern and Northwestern Province, thick dark mudstone and shale also occurred with high organic matter content and certain maturity is favorable for shale gas. In Cai-3 well of Zhungaer Basin, good gas show has been detected in shale layer.