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通过对准噶尔盆地妖魔山与大龙口剖面的2个烃源岩样品进行封闭体系模拟实验分析,获取不同温度条件下中二叠统烃源岩生油气量及相关地球化学参数,研究该地区Ⅰ型干酪根与Ⅱ1型干酪根的生烃演化模式,另外,选取该地区的相关地球化学参数与烃源岩厚度,计算准南缘中二叠统烃源岩至现今的天然气不同组分强度。结果表明:二叠系烃源岩Ⅰ型干酪根生油气量明显高于Ⅱ1型干酪根,生油能力持续时间长,生油区间的RO值为0.6%~2.0%;Ⅱ1型干酪根生油能力明显较弱,生油区间RO值为0.7%~1.3%。Ⅰ型干酪根生气的RO值从1.3%开始,生气量逐渐增加,Ⅱ1型干酪根生气要早一些,从RO值为1.0%时开始,生气量也明显低于Ⅰ型。3个剖面以大龙口地区二叠系烃源岩的生气强度最高,为167.52×108m3/km2,甲烷与乙烷的强度也最高;其次为妖魔山剖面,生气强度为118.88×108m3/km2;红雁池剖面的生气强度最低,为11.46×108m3/km2。总体而言,准噶尔盆地南缘生气潜力较高,勘探前景广阔。
By simulating and analyzing the two source rock samples of the Devonian and Dalongkou sections in the Junggar Basin, the oil and gas volume and related geochemical parameters of the Middle Permian hydrocarbon source rocks under different temperature conditions were obtained. The effects of type I cheeses Root and type II1 kerogen. In addition, the geochemical parameters and source rock thickness of the area are selected to calculate the intensity of different components of the natural gas from the Middle Permian source rock to the present. The results show that the type Ⅰ kerogen of the Permian hydrocarbon source rocks is significantly higher than that of the type Ⅱ1 kerogen, and the oil generation ability lasts for a long time with a RO value of 0.6% -2.0% in the oil zone. Type Ⅱ1 kerogen oil The ability is obviously weaker, RO value of oil production range is 0.7% ~ 1.3%. The kerogen type Ⅰ kerogen RO value from 1.3%, the gas production increased gradually, Type II kerogen gas earlier, from the RO value of 1.0%, the gas production was significantly lower than type Ⅰ. The three sections have the highest gas generation intensity of Permian source rocks in Da Longkou area, which is 167.52 × 108m3 / km2 with the highest methane and ethane intensity, followed by the Yaogeshan section with gas intensity of 118.88 × 108m3 / km2, red The angry strength of Yanchi section is the lowest, which is 11.46 × 108m3 / km2. Overall, the southern margin of the Junggar Basin has higher potential for gas generation and has a vast exploration prospect.