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滨海地区深层天然气资源丰富,但天然气成因类型及气源认识仍存在疑问,制约着勘探方向的选择。滨海地区深层天然气组分及碳同位素特征的分析表明,其为成熟—高成熟的煤型天然气,属于湿气—偏湿气。气源分析表明,天然气主要源自深部的沙河街组烃源岩,受次级凹陷控制,其中滨深22井区天然气主要源自歧北次凹沙三段烃源岩,歧深1井区天然气主要源自歧口凹陷沙三段烃源岩,滨海4井区即滨海斜坡沙一段天然气主要源自歧口凹陷沙一段烃源岩。研究区滨深22井和歧深1井天然气碳同位素具有倒转序列特征,主要是由于烃源岩在演化生气过程中,不同来源、不同时期形成的天然气混合造成。滨海地区深层天然气主要是热成因湿气、以自源为主、多阶段煤型气混合形成的天然气藏。
The deep natural gas in the coastal area is rich in resources. However, there are still some questions about the genetic type of gas and the understanding of gas source, which restricts the choice of exploration direction. The analysis of deep natural gas composition and carbon isotopic characteristics in the coastal area shows that it is a mature-highly mature coal-type natural gas and belongs to moisture-partial moisture. The gas source analysis shows that natural gas is mainly derived from the source rocks of the Shahejie formation in the deep and controlled by the secondary depression. The natural gas in the well Bianshen 22 is mainly derived from the source rock of the third member of the Qaisha Formation in Qibei Sag, Natural gas is mainly derived from the source rock of Es3 in the Qikou Sag. The gas in the first phase of the Esplanade in the coastal area of Binhai 4 is mainly from the source rock of the Es1 in the Qikou Sag. The carbon isotopes of natural gas in Binnshen22 well and Qishen-1 well in the study area have reversal sequence characteristics, mainly due to the mixing of natural gas from different sources and periods in the process of evolution gas generation. The deep natural gas in the coastal area is mainly a natural gas reservoir formed by the combination of multi-stage coal gas and self-sourced moisture.