关键词: 中亚, 上古生界, 油气形成, 分布规律, 准噶尔盆地, 石炭系, 油气勘探, 启示

Abstract: Oil and gas is abundant in Carboniferous and Devonian Mud of Upper Palaeozoic in Central Asia. Analyzing the regularity of oil-gas formation and distribution at Upper Palaeozoic in Pre-Caspian Basin and Chu-Saryus Basin in Central Asia indicated that oil and gas enrichment zones at Upper Palaeozoic were related to huge fractures and fluids coming from deep of the earth. Interdependency and interaction between deep structures of the earth and sedimentary seal resulted in the enrichment. Predecessors regarded that oil and gas distribution and enrichment in Carboniferous was under control of the distribution of Carboniferous source rock, structure background and volcanic lithofacies zones. Besides, Central Asia is close to Xinjiang, and its geological structure is also similar to that of Junggar Basin. In comparison with the regularity of oil formation and distribution at Upper Palaeozoic, and considering geological features and current state of oil-gas exploration at Carboniferous in Upper Palaeozoic, it was considered that Carboniferous source rocks in Junggar Basin suffered from magmatic emplacement such as jet flow, and were intensively altered, leading to secondary hydrocarbon generation. The pattern of hydrocarbon generation inside volcanic rock is different from the traditional one. With combined action of materials from mantle and hot alteration of source rocks, it is believed that there would be great potential of hydrocarbon generation at Carboniferous in Junggar Basin

Key words: CentralAsia;UpperPalaeozoic, oil-gas formation, regularity of distribution, JunggarBasin;Carboniferous;oil-gas exploration, enlightenment