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鄂尔多斯盆地东南部页岩气资源潜力巨大,目前缺乏对山西组泥页岩生烃潜力的系统评价,因而制约了对该区烃源岩资源潜力的客观评价。通过高压釜—封闭式金管的生烃热模拟实验,分析烃源岩生烃过程,对比山1段和山2段的生烃潜力,生烃动力学拟合证明实验结果真实可靠。实验结果表明:(1)甲烷和非烃类气体具有相似产出特征,重烃气C_(2-5)和液态烃具有相似产出特征;(2)当_RO值为0.80%~1.08%时,液态烃达到产率峰值;当R_O值达到1.47%~1.81%时,重烃气C_(2-5)达到产率峰值;当R_O值超过3%,重烃气C_(2-5)几乎全部裂解,干燥系数接近1;(3)实验表明山2段属于更好的烃源岩,结合页岩气井地化数据,进一步确认山2段生烃潜力远远超过山1段,研究认为山2段更适合作为鄂尔多斯盆地海陆过渡相页岩气的有利勘探层段。
There is a great potential for shale gas resources in southeastern Ordos Basin. Currently, there is a lack of systematic evaluation of shale hydrocarbon generating potential in Shanxi Formation, which restricts the objective evaluation of the potential of source rocks in this area. Hydrocarbon generation process of the source rock was analyzed by hydrocarbon generation heat simulation experiment of autoclave - closed tube. The hydrocarbon generation potential was compared with that of the first and the second sections of Shan. The kinetic fitting of hydrocarbon generation proved the experimental results were reliable. The experimental results show that: (1) Methane and non-hydrocarbon gases have similar output characteristics. C_ (2-5) of heavy hydrocarbon gas and liquid hydrocarbon have similar output characteristics; (2) When the value of _RO is 0.80% ~ 1.08% When the value of R_O reaches 1.47% ~ 1.81%, the peak value of the yield of heavy hydrocarbon gas reaches to that of C_ (2-5); when the value of R_O exceeds 3%, the value of C_ (2-5) Almost all of them are cracked and the drying coefficient is close to 1. (3) Experiments show that Shan 2 is a better source rock. Combined with the geochemical data of shale gas wells, it is further confirmed that the hydrocarbon generation potential of Shan 2 is much higher than that of Shan 1, Mountain 2 is more suitable for the favorable exploration interval of shale gas in the transitional facies of the Ordos Basin.