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以琼东南盆地的前第三系1块基底灰岩样品为替代样品,应用热模拟实验方法,进行了一系列不同含水条件下的热解实验,并对实验产物CO2的产率和碳同位素进行了分析,探讨了莺歌海盆地基底灰岩的生气情况。结果表明,水的存在与否、含水量的多少均对灰岩热解生成CO2有重大影响。水可以促进灰岩热解生成CO2气体,并能够极大地降低灰岩的热解温度。与无水条件相比,含水条件下灰岩热解产物CO2的碳同位素明显变轻。通过与前人钙质泥岩热解实验对比,并结合莺歌海盆地实际地质资料,研究认为莺歌海盆地CO2气藏可能主要来源于中新统海相钙质泥岩,而前第三系基底灰岩的贡献很少。
Taking a sample of the basement limestone of the former Tertiary in the Qiongdongnan Basin as a substitute sample, a series of pyrolysis experiments under different water conditions were carried out by using thermal simulation experiment. The yield and carbon isotope of the experimental product Analyzed and discussed the angry situation of the basement limestone in Yinggehai Basin. The results show that the existence of water or not, the amount of water content of limestone pyrolysis have a significant impact on the generation of CO2. Water can promote the pyrolysis of limestone to generate CO2 gas, and can greatly reduce the pyrolysis temperature of limestone. Compared with the anhydrous condition, the carbon isotope of pyrolysis product of limestone obviously decreases under the condition of water. Through the comparison with previous studies on calcareous mudstone pyrolysis and the actual geological data in Yinggehai Basin, it is concluded that the CO2 gas reservoir in Yinggehai Basin probably originated from the Miocene marine calcareous mudstone while the former Tertiary basement Little contribution to the limestone.