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歧深1井碳同位素分布呈δ13C3>δ13C2>δ13C1的特征,甲烷碳同位素较重,乙烷和丙烷的同位素异常重,干燥系数较高,天然气的演化程度也较高,处于高成熟阶段。同位素、组分和轻烃特征表明歧深1井天然气为干酪根裂解气和原油裂解气的混合气,并且来自于偏腐殖型干酪根。通过歧深1井的发现证明歧口凹陷深层确实存在高成熟的油气,而且中浅层未发现这种高成熟天然气,说明深层高成熟天然气没有运移到中浅层意示着延伸到深层断裂晚期处于封闭状态,或者是由于高压影响,使高成熟天然气无法运移到中浅层储层,说明深层具有独立的成藏系统高成熟天然气保存良好,意示深层具有很好的天然气勘探前景。
The δ13C3> δ13C2> δ13C1 carbon isotope distribution of Qishen-1 well shows that carbon isotope of methane is heavy, isotope of ethane and propane are heavy, dry coefficient is high, and gas evolution is high, which is at a high mature stage. The isotopic, compositional and light hydrocarbon characteristics indicate that the gas in Qishen-1 well is a mixture of kerogen gas and crude pyrolysis gas, and is derived from humic kerogen. The discovery of Qishen-1 well proves that there are indeed highly mature oil-gas in the deep Qikou sag, and no such high-mature natural gas is found in the middle and shallow layers, indicating that the deep high mature gas does not migrate to the middle-shallow layer and extends to deep faults Late closed in the state, or because of the impact of high pressure, so that high-mature natural gas can not migrate to medium-shallow reservoir, indicating that the deep reservoir has a separate system of high-mature well-preserved natural gas, which means that there is a good natural gas exploration prospects.