利用生烃动力学和碳同位素生烃动力学探索油气田气体来源

Discussion on the Source of Oil and Gas Using the Dynamics of Carbon Isotope and Hydrocarbon Generation

利用气体碳同位素探索油气来源的传统方法由于受源岩类型、源岩成熟度等因素的影响,其实际应用受到很大的限制。生烃动力学和碳同位素动力学结合在这方面具有非常明显的优越性。本文利用热模拟实验,通过生烃动力学和碳同位素动力学计算,表明鄂尔多斯盆地上古生界苏里格气田气体的主要是他源阶段累积气,来源于气田南部高成熟区域、西部的天环坳凹陷气体的贡献比例分别为49%、22%,气田区域的源岩累积气体占29%。

The application value of traditional method to explore the oil and gas source using carbon isotope was bounded by the type and maturity of source rock. The method to combine the kinetics of carbon isotope with that of hydrocarbon generation has great advantages in discussing the source of oil and gas. In this paper, the thermal simulation experiment to the source rock was done , the results of kinetics calculation of hydrocarbon generation and carbon isotope have shown that the gas of Suligemiao gas field in the Upper Paleozoic stratum in Ordos basin mainly belong to stage accumulation gas which come from around areas, the contributions to the gas field from high maturity southern area and Tianhuan depression are 49% and 22% respectively, and the accumulation gas come from Suligemiao area is only make up of 29%.