中国大中型油气田的主力烃源岩分布特征

中国大中型油气田主力烃源岩的分布在时代、盆地类型、岩性和沉积环境方面都具有多样性。在地质时代上 ,从中元古代到新生代 (泥盆系除外 )均有烃源岩分布 ,最重要的是在中、新生代。在盆地类型上 ,有中、新生代的裂谷盆地、古生代早期的克拉通盆地和晚期的前陆盆地、以及中生代的前陆盆地。不同类型盆地的烃源岩的分布、地质地化特征和生烃潜力差别较大。源岩类型有海相碳酸盐岩、泥岩以及海陆过渡相和陆相泥岩、煤系及碳酸盐岩 ,其中以湖相碎屑岩为主。

Distribution of major hydrocarbon source rocks in China's large and medium-sized oil and gas fields

Distribution of major source rocks in China's large and medium_sized oil_gas fields is of diversifcation and complexity in geologic age,basin types,lithology and sedimentary environment.These source rocks developed with strata from Middle Proterozoic to Cenozoic(excluding Devonian),among which the Mesozoic and Cenozoic layers are the most important.The basins that developed source rocks include the rift basin of Mesozoic_Cenozoic,the cratonic basin of early Paleozoic,and the foreland basin of Mesozoic and Late Paleozoic.There are quite large differences in distribution,geological and geochemical characteristics and hydrocarbon generation potential of source rocks between different types of basins.The source rocks include the marine carbonate and mudstone,and the transitional and terrestrial mudstone,coal measure strata and carbonate.The major one is lacustrine clastic rock.