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根据松辽盆地北部在天然气勘探方面近年来取得的一些进展,总结了以下几点认识:①本地区存在着中浅层和深层两套气源岩。②据有机质的演化情况推测,中浅层油气同产,深层以产气为主。③白垩系青山口组和嫩一段最有利生油气区附近是中浅层含气的较富集区,侏罗系断陷附近是深层含气的较富集区。④天然气更适于较长距离运移聚集在区域构造较高的区带处,因此,在距生油气区较远的有利构造部位同样能形成天然气藏。⑤良好的盖层是形成气藏的重要条件。局部地区比较稳定的隔层,也有利于形成多套气油水组合。⑥断层是天然气在垂向上较长运移的良好通道,导致了次生气藏的形成。⑦目前已找到的天然气藏以背斜、断块、断鼻、古潜山等构造圈闭为主,部分地区的资料表明,岩性和水动力等其它因素对天然气藏的形成也起着一定的作用。文中也指出了中浅层和深层天然气勘探的重点层位和有利地区。
According to some progress made in recent years in the exploration of natural gas in the north of Songliao Basin, the following points are summarized: ① There are two gas source rocks in the middle and shallow layers in the region. According to the evolution of organic matter speculated that the middle and shallow oil and gas with the production of deep gas-based. ③ The Cretaceous Qingshankou Formation and the most favorable hydrocarbon generation area of Nende 1 are relatively enriched areas of gas in the middle and shallow layers, and the enriched areas are deep gas in the vicinity of the Jurassic faults. ④ Natural gas is more suitable for long-distance migration and accumulation in the zone with high tectonic setting. Therefore, natural gas reservoirs can also be formed in favorable structural parts far away from the hydrocarbon generation area. ⑤ good cover is an important condition for the formation of gas reservoir. Relatively stable in some areas of the compartment, but also conducive to the formation of multiple sets of gas oil and water combination. ⑥ Fault is a good channel for the long vertical migration of natural gas, resulting in the formation of secondary gas reservoirs. ⑦ The natural gas reservoirs that have been found so far include structural traps such as anticlines, fault blocks, broken nose, buried hills and other structures. Data from some areas indicate that other factors such as lithology and hydrodynamics play a certain role in the formation of natural gas reservoirs Role. The paper also points out the key strata and favorable areas for exploration of medium and shallow natural gas.