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通过系统分析源岩沉积样式并结合区域地温场,综合研究了塔里木盆地下古生界和四川盆地古生界海相烃源岩的热演化特征,建立了相应的成烃模式,探讨了各自的生烃潜力.海相烃源岩可划分为4种成烃演化模式:早期快速演化型、中期快速演化型、持续演化型和多期演化型.其中,早期快速演化型对形成工业性油气藏直接贡献不大,以寻找古油藏或原油裂解气为主;中期快速演化型虽然已发现较多气藏,但总体规模有限;后两种类型都取决于前期的演化程度,若较低后期仍可生成液态原油,否则以生气为主.四川盆地古油藏得以较好地保存,源岩普遍经历了干酪根-油-气的演化过程,这对于塔里木盆地天然气勘探具有一定的借鉴意义.
By systematically analyzing the sedimentary styles of source rocks and combining with the regional geotemperature field, the thermal evolution characteristics of the Paleozoic marine source rocks in the Lower Paleozoic in the Tarim Basin and the Paleozoic in the Sichuan Basin have been studied. Corresponding hydrocarbon generation models have been established and their respective Hydrocarbon generation potential. Marine hydrocarbon source rocks can be divided into four types of hydrocarbon evolution: early rapid evolution, middle rapid evolution, persistent evolution and multi-evolution. Among them, the rapid evolution of the early formation of industrial oil and gas reservoirs The direct contribution is not big, in order to look for the paleo-oil reservoir or the cracked gas of the crude oil mainly; The medium-term rapid evolution type has found more gas reservoirs, but the overall scale is limited; the latter two types depend on the evolution of the earlier period, Liquid petroleum gas can still be generated, otherwise the gas is the main gas source.The paleo-oil reservoirs in Sichuan Basin can be preserved well, and the source rocks generally experienced the evolution of kerogen-oil-gas, which is of some reference to natural gas exploration in Tarim Basin.