2012, Volume 14, Issue 6
Strategic Study of CAE >> 2012, Volume 14, Issue 6
Comparison and enlightenment on formation condition and distribution characteristics of shale gas between China and U.S.
Research Institute of Petroleum Exploration & Development, Petrochina, Beijing 100083, China
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Abstract
Shale gas in America mostly comes from thermogenic marine shales, and gas shales mainly distribute in Devonian and Carboniferous of Foreland and Craton basins, while the buried depth is 1 500~3 500 m. Shales in China include 3 types: marine, transitional and lacustrine. Marine shales basically distribute in the lower Paleozoic of Aulacogen and Craton basins;organic-rich concentrated parts are steady-going,and thermal maturity phase and gas content are high,so the explorational prospect is the best. Transitional shales mostly distribute in Carboniferous-Jurassic of Foreland and Craton basins;there is no obvious organic-rich concentrated part, and gas content changes greatly, so the explorational potential needs to be proved. Lacustrine shales typically distribute in Mesozoic and Cenozoic of rift and Craton basins;organic-rich concentrated parts are thick and stable, and explorational potential is probably great in center of depression which reaches generating gas stage.It is forecast that shale gas exploration will take a long time and output will be 50 billion~60 billion m3 in the future.
Keywords
shale gas ; formation condition ; distribution characteristics ; organic rich shale ; comparison between China and U.S. ; enlightenment
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