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根据中国15个含油气盆地的100个大中型油气田的研究成果,分析了中国大中型油气田的结构及分布规律。指出,中国大中型油田主要分布在裂谷型盆地中,大中型气田主要分布在克拉通盆地和山前盆地中;陆相生烃岩是中国大中型油气田的主要生烃岩,生烃岩从早古生代到新生代都有,南中国海和东中国海的古近系和新近系,中国北方的侏罗系和石炭系-二叠系是中国的主要生气层,古近系、新近系、白垩系、侏罗系、三叠系、二叠系是中国主要的生油层;大中型气田的储集层主要为陆源层(中砂岩、细砂岩和砂砾岩),其成因类型为扇三角洲和三角洲体系,碳酸盐岩储集层主要为裂缝型、风化壳型;油气藏盖层主要为均质泥岩;油气成藏期较晚,绝大多数大中型油气田形成于新生代,在早古生代地层中仍有相当储量的油气田未被发现。中国油气资源潜力丰富,大多数盆地的油气处于开发的早中期,发现大中型油气田的可能性是很大的。
According to the research results of 100 large and medium-sized oil and gas fields in 15 petroliferous basins in China, the structure and distribution of large and medium-sized oil and gas fields in China are analyzed. It is pointed out that large and medium-sized oilfields in China are mainly distributed in rift basins, large and medium-sized gas fields are mainly distributed in cratonic and piedmont basins; continental hydrocarbon-generating rocks are the major hydrocarbon generating rocks in large and medium-sized oil and gas fields in China. Paleozoic to Cenozoic, Paleogene and Neogene of the South China Sea and the East China Sea, Jurassic and Carboniferous-Permian of North China are the main gas genera of China, Paleogene, Neogene, Cretaceous Jurassic, Triassic and Permian are the major oil-producing reservoirs in China. The reservoirs in large and medium-sized gas fields are mainly terrigenous (medium-sandstone, fine-sandstone and conglomerate) and their genetic types are fan-delta and delta In the system, the carbonate reservoirs are mainly fractured and weathering crusts. The caprock of oil and gas reservoirs is mainly homogeneous mudstone. Late hydrocarbon accumulation period is the vast majority of medium-sized oil and gas fields formed in the Cenozoic. In the Early Paleozoic strata There is still a considerable amount of oil and gas fields undetected. The potential of oil and gas resources in China is abundant. Most of the oil and gas in the basins are in the early and middle stages of development. The possibility of large and medium-sized oil and gas fields is very large.