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四川盆地广安地区天然气地质储量丰富,但其烃源岩发育有限。选取广安地区须家河组煤,采用封闭体系进行热解和动力学研究,对该地区的生烃特征和生烃过程进行模拟。研究该地区煤的生烃特征和生烃动力学参数,恢复该地区天然气的生烃史。结果显示,广安地区须家河组煤系烃源岩开始生气时间主要在晚侏罗世(距今168Ma左右),后期由于燕山运动影响,导致地壳抬升,地温骤降,在侏罗世与白垩世之间即140Ma左右结束生烃,其生气持续时间为28Ma左右。生烃转化率多在50%以上,具有短时期快速生气的特点。良好的生储盖组合与断裂不发育是天然气得以长期保存的关键。
The Guang’an area in Sichuan Basin is rich in natural gas reserves, but its source rock development is limited. The Xujiahe Formation coal in Guang’an area was selected to study the pyrolysis and kinetics of the closed system, and the hydrocarbon generation characteristics and hydrocarbon generation processes in the area were simulated. Research on hydrocarbon generation characteristics and hydrocarbon generation kinetics parameters of coal in this area to restore the hydrocarbon generation history of natural gas in this area. The results show that the source rocks of the Xujiahe Formation in Guang’an started to gas-up mainly in the Late Jurassic (about 168 Ma up to now) and later due to the Yanshan movement, the crust uplifted and the temperature dropped rapidly. In Jurassic and Cretaceous Around the world that 140Ma end of hydrocarbon generation, the life duration of about 28Ma. Hydrocarbon conversion rate more than 50%, with a short period of rapid angry characteristics. Good reservoir-cap assemblage and rupture are the keys to the long-term preservation of natural gas.