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中国大中型油气田主力烃源岩的分布在时代、盆地类型、岩性及沉积环境方面都具有多样性,主要特征可归纳为以下几点。(1)主力烃源岩发育于三种盆地类型,即东部裂谷盆地,中西部克拉通盆地,中西部前陆盆地。最重要的源岩时代为中、新生代。(2)在时代上,除上古生界泥盆系以外,其他的从震旦系到新生界各层系均分布有质量较好的烃源岩。(3)烃源岩岩性除以陆相泥质岩为主外,海相碳酸盐岩、泥岩和陆相煤系地层(主要是侏罗系、三叠系)的
The distribution of main source rocks in large and medium-sized oil and gas fields in China is diverse in age, basin type, lithology and sedimentary environment. The main features can be summarized as follows. (1) The main source rocks are developed in three types of basins: the eastern rift basin, the mid-western craton basin and the mid-western foreland basin. The most important source rock age is Mesozoic and Cenozoic. (2) In the age, besides the Upper Paleozoic Devonian, other source rocks with good quality are distributed in all layers from Sinian to Cenozoic. (3) The lithology of hydrocarbon source rocks is mainly composed of marine carbonate, mudstone and continental facies strata (mainly Jurassic and Triassic) except for continental mudstone