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利用已获得的国内外典型海相有机质(原油与干酪根)的生气动力学参数,采用生烃动力学方法,计算地质历史中天然气的产率和产气速率,利用EasyRo方法计算成熟度。经过二者的耦合,确定Ⅰ型干酪根主生气期的Ro值为1.4%～2.4%,Ⅱ型干酪根主生气期的Ro值为1.5%～3.0%,原油裂解气主生气期的Ro值为1.6%～3.2%。以塔里木盆地塔西南地区为例,初步探讨系统的开放度对主生气期的影响及天然气“死亡线”的问题,研究结果,模拟系统开放度对主生气期的动力学参数计算有一定影响,开放系统Ⅱ型干酪根主生气期的Ro值为1.4%～3.1%,天然气主生气期比封闭系统要早。根据研究结果,初步确定海相有机质天然气“死亡线”为Ⅰ型干酪根Ro值约为3.5%,Ⅱ型干酪根Ro值为4.4%～4.5%,海相原油Ro值约为4.6%。图4表1参29
Based on the obtained aerodynamic parameters of marine organic matter (crude oil and kerogen) at home and abroad, hydrocarbon generation kinetic method was used to calculate natural gas production rate and gas production rate in geological history, and the maturity was calculated by EasyRo method. Through the coupling of the two, the Ro value of type I kerogen was 1.4% -2.4% and that of type II kerogen was 1.5% -3.0%. The value of Ro in the main gas generation period of cracked gas 1.6% ~ 3.2%. Taking the area of southwestern Tarim Basin as an example, the effects of system openness on the main gas period and the “death line” of natural gas are discussed preliminarily. The results show that the degree of openness of the simulated system has some influence on the kinetic parameters of the main gas generation, The Ro value of open system type II kerogen was 1.4% ~ 3.1% during the main gas-forming period, and the gas-bearing period of natural gas was earlier than that of the closed system. According to the research results, the “dead line” of marine natural gas is preliminarily determined to be about 3.5% for type I kerogen, 2.8% for kerogen type II and 4.6% for marine oil. Figure 4 Table 1 Reference 29