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利用地层孔隙热压生排烃模拟仪实验装置,对采自四川盆地西北部广元矿山梁地区下寒武统具高有机质含量、高氢指数和低成熟度特征的固体沥青,开展了模拟地层条件下的“沥青+白云岩+去离子水”(系列A)和“沥青+白云岩+硫酸镁+去离子水”(系列B)生排烃实验。结果表明,这两个系列的气体产率具有较大差异,其中,加入硫酸镁的系列(系列B)发生了热化学硫酸盐还原反应(TSR),使气态烃和非烃气体的产率增大,同时也加速了重烃气体的裂解,导致重烃气体大量裂解的温度降低。
By using the experimental device of stratum pore thermal pressure hydrocarbon generation and expulsion hydrocarbon simulator, the simulated solid formation conditions of the lower Cambrian solid bitumen with high organic matter content, high hydrogen index and low maturity collected from the Beiliang area in Guangyuan, northwestern Sichuan Basin, Under the “asphalt + dolomite + deionized water” (Series A) and “asphalt + dolomite + magnesium sulfate + deionized water” (Series B) hydrocarbon generation and expulsion experiments. The results showed that there was a large difference in the gas yields of the two series, in which the thermochemical sulfate reduction (TSR) occurred in the series of magnesium sulfate added (series B) and the yield of gaseous and non-hydrocarbon gases was increased Large, but also accelerated the cracking of heavy hydrocarbon gas, resulting in a large number of heavy hydrocarbon gas cracking temperature decreases.